Cgs synth

> hi all,
> i've put a bi-n-tic filter together recently. the filter section seems
> to be working - it definitley filters an input signal, but otherwise
> there's not a peep out of it. cv, fm have no effect. i'm 99 percent
> sure everything's where it should be...
> i bought the filter as a kit from laurie at elby designs, and the jfet
> was a j108, which i swapped for a 2n5457 (on a whim,really). anyone
> have any experience with this? any parts more prone to failure than
> others?
> thanks,
> andrew.
>
>
>
>
>
>
>
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>

--- In cgs_synth@yahoogroups.com, "kopernig" <6079smith@...> wrote:
>
> yes, i noticed the diode and put in a jumper... but still no joy. i
> don't have a scope (yet) but the voltage on pin six of the ca3140
is
> just under 1 volt. with an audio probe i can (barely) hear a cv
click.
> so the vco is not oscillating. i can't figure out why the 2n2
> capacitor seems to be shorted... there's no resistance between the
> source and drain of the fet. nothing is physically shorted. a dead
> fet? any ideas?
> andrew.
>

>when i wanted to test my bin-n-tic, i incidently switched + and -
>power supply. after i fixed the problem, I have no sound whatsoever.
>I measured 1.1 volt between pin6 of the ca3140.
>Is there any part(s) that is the most likely to be damaged ?
>thx,
>steven
>
>--- In cgs_synth@yahoogroups.com, "kopernig" <6079smith@...> wrote:
>>
>> yes, i noticed the diode and put in a jumper... but still no joy. i
>> don't have a scope (yet) but the voltage on pin six of the ca3140
>is
>> just under 1 volt. with an audio probe i can (barely) hear a cv
>click.
>> so the vco is not oscillating. i can't figure out why the 2n2
>> capacitor seems to be shorted... there's no resistance between the
>> source and drain of the fet. nothing is physically shorted. a dead
>> fet? any ideas?
>> andrew.
>>
>
>
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>
>

--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Test #1 - feel if any chip is getting hot. If it is, replace it.
>
> Ken
>
> >when i wanted to test my bin-n-tic, i incidently switched + and -
> >power supply. after i fixed the problem, I have no sound
whatsoever.
> >I measured 1.1 volt between pin6 of the ca3140.
> >Is there any part(s) that is the most likely to be damaged ?
> >thx,
> >steven
> >
> >--- In cgs_synth@yahoogroups.com, "kopernig" <6079smith@> wrote:
> >>
> >> yes, i noticed the diode and put in a jumper... but still no
joy. i
> >> don't have a scope (yet) but the voltage on pin six of the
ca3140
> >is
> >> just under 1 volt. with an audio probe i can (barely) hear a cv
> >click.
> >> so the vco is not oscillating. i can't figure out why the 2n2
> >> capacitor seems to be shorted... there's no resistance between
the
> >> source and drain of the fet. nothing is physically shorted. a
dead
> >> fet? any ideas?
> >> andrew.
> >>
> >
> >
> >
> >
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
>
_____________________________________________________________________
__
> Ken Stone sasami@...
> Modular Synth PCBs for sale
<http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>
>

On Nov 4, 2006, at 6:08 AM, stiebz wrote:

> No chips are hot ( and nothing smells burned )
> The TL072 seems to working fine, output 7 follows the frequency
> settings, but on the CA3140 I always measure 0.56 V on pin 2 and 1.1
> V on pin 6 regardless of the frequency setting. Would this indicate
> a faillure on the CA3140 or the LM394 ?
> thanks !
> steven
>
> --- In cgs_synth@yahoogroups.com, sasami@... wrote:
> >
> > Test #1 - feel if any chip is getting hot. If it is, replace it.
> >
> > Ken
> >
> > >when i wanted to test my bin-n-tic, i incidently switched + and -
> > >power supply. after i fixed the problem, I have no sound
> whatsoever.
> > >I measured 1.1 volt between pin6 of the ca3140.
> > >Is there any part(s) that is the most likely to be damaged ?
> > >thx,
> > >steven
> > >
> > >--- In cgs_synth@yahoogroups.com, "kopernig" <6079smith@> wrote:
> > >>
> > >> yes, i noticed the diode and put in a jumper... but still no
> joy. i
> > >> don't have a scope (yet) but the voltage on pin six of the
> ca3140
> > >is
> > >> just under 1 volt. with an audio probe i can (barely) hear a cv
> > >click.
> > >> so the vco is not oscillating. i can't figure out why the 2n2
> > >> capacitor seems to be shorted... there's no resistance between
> the
> > >> source and drain of the fet. nothing is physically shorted. a
> dead
> > >> fet? any ideas?
> > >> andrew.
> > >>
> > >
> > >
> > >
> > >
> > >
> > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > >
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> >
> __________________________________________________________
> __
> > Ken Stone sasami@...
> > Modular Synth PCBs for sale
> <http://www.blaze.net.au/~sasami/synth/>
> > Australian Miniature Horses & Ponies
> <http://www.blaze.net.au/~sasami/>
> >
>
>
>



[Non-text portions of this message have been removed]

>
> when i wanted to test my bin-n-tic, i incidently switched + and -
> power supply. after i fixed the problem, I have no sound whatsoever.
> I measured 1.1 volt between pin6 of the ca3140.

--- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@...> wrote:
>
> one thing to keep in mind is that CA3140s are super delicate ICs.
> They are very sensitive to static, but it wouldn't surprise me if
> hooking up power in reverse was too much for it to handle.
>
> Romeo
>
>
> On Nov 4, 2006, at 6:08 AM, stiebz wrote:
>
> > No chips are hot ( and nothing smells burned )
> > The TL072 seems to working fine, output 7 follows the frequency
> > settings, but on the CA3140 I always measure 0.56 V on pin 2 and
1.1
> > V on pin 6 regardless of the frequency setting. Would this
indicate
> > a faillure on the CA3140 or the LM394 ?
> > thanks !
> > steven
> >
> > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > >
> > > Test #1 - feel if any chip is getting hot. If it is, replace
it.
> > >
> > > Ken
> > >
> > > >when i wanted to test my bin-n-tic, i incidently switched +
and -
> > > >power supply. after i fixed the problem, I have no sound
> > whatsoever.
> > > >I measured 1.1 volt between pin6 of the ca3140.
> > > >Is there any part(s) that is the most likely to be damaged ?
> > > >thx,
> > > >steven
> > > >
> > > >--- In cgs_synth@yahoogroups.com, "kopernig" <6079smith@>
wrote:
> > > >>
> > > >> yes, i noticed the diode and put in a jumper... but still no
> > joy. i
> > > >> don't have a scope (yet) but the voltage on pin six of the
> > ca3140
> > > >is
> > > >> just under 1 volt. with an audio probe i can (barely) hear
a cv
> > > >click.
> > > >> so the vco is not oscillating. i can't figure out why the
2n2
> > > >> capacitor seems to be shorted... there's no resistance
between
> > the
> > > >> source and drain of the fet. nothing is physically shorted.
a
> > dead
> > > >> fet? any ideas?
> > > >> andrew.
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > >
> > > >Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > __________________________________________________________
> > __
> > > Ken Stone sasami@
> > > Modular Synth PCBs for sale
> > <http://www.blaze.net.au/~sasami/synth/>
> > > Australian Miniature Horses & Ponies
> > <http://www.blaze.net.au/~sasami/>
> > >
> >
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>

--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@...> wrote:
>
> unfortunately my bintic filter is still not working...
> I've replaced the tl072, ca3140 and the lm394, but still the
> oscillator part is not working as expected.
> I've noticed that depending on the setting of the frequency coarse
> pot, I have different readings on the circuit.
> I've added here a link to a part of the circuit diagram where I've
> indicated some measurements done in both minimum and maximum
> position of the frequency coarse potmeter. I hope somebody can give
> me clue where more or less the problem should be with this data.
> Thanks a lot in advance, you can find the drawing here :
> http://users.telenet.be/theevaporizer/modular/bintic.GIF
>
> steven
>
>
> --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@> wrote:
> >
> > one thing to keep in mind is that CA3140s are super delicate ICs.
> > They are very sensitive to static, but it wouldn't surprise me if
> > hooking up power in reverse was too much for it to handle.
> >
> > Romeo
> >
> >
> > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> >
> > > No chips are hot ( and nothing smells burned )
> > > The TL072 seems to working fine, output 7 follows the frequency
> > > settings, but on the CA3140 I always measure 0.56 V on pin 2 and
> 1.1
> > > V on pin 6 regardless of the frequency setting. Would this
> indicate
> > > a faillure on the CA3140 or the LM394 ?
> > > thanks !
> > > steven
> > >
> > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > >
> > > > Test #1 - feel if any chip is getting hot. If it is, replace
> it.
> > > >
> > > > Ken
> > > >
> > > > >when i wanted to test my bin-n-tic, i incidently switched +
> and -
> > > > >power supply. after i fixed the problem, I have no sound
> > > whatsoever.
> > > > >I measured 1.1 volt between pin6 of the ca3140.
> > > > >Is there any part(s) that is the most likely to be damaged ?
> > > > >thx,
> > > > >steven
> > > > >
> > > > >--- In cgs_synth@yahoogroups.com, "kopernig" <6079smith@>
> wrote:
> > > > >>
> > > > >> yes, i noticed the diode and put in a jumper... but still no
> > > joy. i
> > > > >> don't have a scope (yet) but the voltage on pin six of the
> > > ca3140
> > > > >is
> > > > >> just under 1 volt. with an audio probe i can (barely) hear
> a cv
> > > > >click.
> > > > >> so the vco is not oscillating. i can't figure out why the
> 2n2
> > > > >> capacitor seems to be shorted... there's no resistance
> between
> > > the
> > > > >> source and drain of the fet. nothing is physically shorted.
> a
> > > dead
> > > > >> fet? any ideas?
> > > > >> andrew.
> > > > >>
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > >
> > > > >Yahoo! Groups Links
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > __________________________________________________________
> > > __
> > > > Ken Stone sasami@
> > > > Modular Synth PCBs for sale
> > > <http://www.blaze.net.au/~sasami/synth/>
> > > > Australian Miniature Horses & Ponies
> > > <http://www.blaze.net.au/~sasami/>
> > > >
> > >
> > >
> > >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>

--- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@...> wrote:
>
> Hi
> look at the FET, what kind are you using? right way around etc
> some FETS wont work in these ccts.
> Andrew
>
>
> --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@> wrote:
> >
> > unfortunately my bintic filter is still not working...
> > I've replaced the tl072, ca3140 and the lm394, but still the
> > oscillator part is not working as expected.
> > I've noticed that depending on the setting of the frequency
coarse
> > pot, I have different readings on the circuit.
> > I've added here a link to a part of the circuit diagram where
I've
> > indicated some measurements done in both minimum and maximum
> > position of the frequency coarse potmeter. I hope somebody can
give
> > me clue where more or less the problem should be with this data.
> > Thanks a lot in advance, you can find the drawing here :
> > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> >
> > steven
> >
> >
> > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@> wrote:
> > >
> > > one thing to keep in mind is that CA3140s are super delicate
ICs.
> > > They are very sensitive to static, but it wouldn't surprise me
if
> > > hooking up power in reverse was too much for it to handle.
> > >
> > > Romeo
> > >
> > >
> > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > >
> > > > No chips are hot ( and nothing smells burned )
> > > > The TL072 seems to working fine, output 7 follows the
frequency
> > > > settings, but on the CA3140 I always measure 0.56 V on pin 2
and
> > 1.1
> > > > V on pin 6 regardless of the frequency setting. Would this
> > indicate
> > > > a faillure on the CA3140 or the LM394 ?
> > > > thanks !
> > > > steven
> > > >
> > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > >
> > > > > Test #1 - feel if any chip is getting hot. If it is,
replace
> > it.
> > > > >
> > > > > Ken
> > > > >
> > > > > >when i wanted to test my bin-n-tic, i incidently switched
+
> > and -
> > > > > >power supply. after i fixed the problem, I have no sound
> > > > whatsoever.
> > > > > >I measured 1.1 volt between pin6 of the ca3140.
> > > > > >Is there any part(s) that is the most likely to be
damaged ?
> > > > > >thx,
> > > > > >steven
> > > > > >
> > > > > >--- In cgs_synth@yahoogroups.com, "kopernig" <6079smith@>
> > wrote:
> > > > > >>
> > > > > >> yes, i noticed the diode and put in a jumper... but
still no
> > > > joy. i
> > > > > >> don't have a scope (yet) but the voltage on pin six of
the
> > > > ca3140
> > > > > >is
> > > > > >> just under 1 volt. with an audio probe i can (barely)
hear
> > a cv
> > > > > >click.
> > > > > >> so the vco is not oscillating. i can't figure out why
the
> > 2n2
> > > > > >> capacitor seems to be shorted... there's no resistance
> > between
> > > > the
> > > > > >> source and drain of the fet. nothing is physically
shorted.
> > a
> > > > dead
> > > > > >> fet? any ideas?
> > > > > >> andrew.
> > > > > >>
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > > >
> > > > > >Yahoo! Groups Links
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > __________________________________________________________
> > > > __
> > > > > Ken Stone sasami@
> > > > > Modular Synth PCBs for sale
> > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > Australian Miniature Horses & Ponies
> > > > <http://www.blaze.net.au/~sasami/>
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>

--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@...> wrote:
>
> hey,
>
> I used a 2n4391, I have no clue how I can check if it still is
> working properly, so I'll try to replace this compontent to see if
it
> makes a difference.
>
> thanks,
> steven
>
> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@> wrote:
> >
> > Hi
> > look at the FET, what kind are you using? right way around etc
> > some FETS wont work in these ccts.
> > Andrew
> >
> >
> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
wrote:
> > >
> > > unfortunately my bintic filter is still not working...
> > > I've replaced the tl072, ca3140 and the lm394, but still the
> > > oscillator part is not working as expected.
> > > I've noticed that depending on the setting of the frequency
> coarse
> > > pot, I have different readings on the circuit.
> > > I've added here a link to a part of the circuit diagram where
> I've
> > > indicated some measurements done in both minimum and maximum
> > > position of the frequency coarse potmeter. I hope somebody can
> give
> > > me clue where more or less the problem should be with this
data.
> > > Thanks a lot in advance, you can find the drawing here :
> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > >
> > > steven
> > >
> > >
> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@> wrote:
> > > >
> > > > one thing to keep in mind is that CA3140s are super delicate
> ICs.
> > > > They are very sensitive to static, but it wouldn't surprise
me
> if
> > > > hooking up power in reverse was too much for it to handle.
> > > >
> > > > Romeo
> > > >
> > > >
> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > >
> > > > > No chips are hot ( and nothing smells burned )
> > > > > The TL072 seems to working fine, output 7 follows the
> frequency
> > > > > settings, but on the CA3140 I always measure 0.56 V on pin
2
> and
> > > 1.1
> > > > > V on pin 6 regardless of the frequency setting. Would this
> > > indicate
> > > > > a faillure on the CA3140 or the LM394 ?
> > > > > thanks !
> > > > > steven
> > > > >
> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > >
> > > > > > Test #1 - feel if any chip is getting hot. If it is,
> replace
> > > it.
> > > > > >
> > > > > > Ken
> > > > > >
> > > > > > >when i wanted to test my bin-n-tic, i incidently
switched
> +
> > > and -
> > > > > > >power supply. after i fixed the problem, I have no sound
> > > > > whatsoever.
> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> > > > > > >Is there any part(s) that is the most likely to be
> damaged ?
> > > > > > >thx,
> > > > > > >steven
> > > > > > >
> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
<6079smith@>
> > > wrote:
> > > > > > >>
> > > > > > >> yes, i noticed the diode and put in a jumper... but
> still no
> > > > > joy. i
> > > > > > >> don't have a scope (yet) but the voltage on pin six
of
> the
> > > > > ca3140
> > > > > > >is
> > > > > > >> just under 1 volt. with an audio probe i can (barely)
> hear
> > > a cv
> > > > > > >click.
> > > > > > >> so the vco is not oscillating. i can't figure out why
> the
> > > 2n2
> > > > > > >> capacitor seems to be shorted... there's no
resistance
> > > between
> > > > > the
> > > > > > >> source and drain of the fet. nothing is physically
> shorted.
> > > a
> > > > > dead
> > > > > > >> fet? any ideas?
> > > > > > >> andrew.
> > > > > > >>
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >The CGS Modular Synth home page:
http://www.cgs.synth.net/
> > > > > > >
> > > > > > >Yahoo! Groups Links
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > __________________________________________________________
> > > > > __
> > > > > > Ken Stone sasami@
> > > > > > Modular Synth PCBs for sale
> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > Australian Miniature Horses & Ponies
> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> >
>

>hello,
>no luck so far, I've replaced the 2N4391 fet, but still no voltage
>on pin 2 of the ca3140. I've also measured with a scope to see what
>is exactly the output on pin 6 of the ca3140, and it shows only a dc
>voltage ( 0.86 V )
>
>any more clues ?
>many thanks in advance !
>steven
>
>--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@...> wrote:
>>
>> hey,
>>
>> I used a 2n4391, I have no clue how I can check if it still is
>> working properly, so I'll try to replace this compontent to see if
>it
>> makes a difference.
>>
>> thanks,
>> steven
>>
>> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@> wrote:
>> >
>> > Hi
>> > look at the FET, what kind are you using? right way around etc
>> > some FETS wont work in these ccts.
>> > Andrew
>> >
>> >
>> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
>wrote:
>> > >
>> > > unfortunately my bintic filter is still not working...
>> > > I've replaced the tl072, ca3140 and the lm394, but still the
>> > > oscillator part is not working as expected.
>> > > I've noticed that depending on the setting of the frequency
>> coarse
>> > > pot, I have different readings on the circuit.
>> > > I've added here a link to a part of the circuit diagram where
>> I've
>> > > indicated some measurements done in both minimum and maximum
>> > > position of the frequency coarse potmeter. I hope somebody can
>> give
>> > > me clue where more or less the problem should be with this
>data.
>> > > Thanks a lot in advance, you can find the drawing here :
>> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
>> > >
>> > > steven
>> > >
>> > >
>> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@> wrote:
>> > > >
>> > > > one thing to keep in mind is that CA3140s are super delicate
>> ICs.
>> > > > They are very sensitive to static, but it wouldn't surprise
>me
>> if
>> > > > hooking up power in reverse was too much for it to handle.
>> > > >
>> > > > Romeo
>> > > >
>> > > >
>> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
>> > > >
>> > > > > No chips are hot ( and nothing smells burned )
>> > > > > The TL072 seems to working fine, output 7 follows the
>> frequency
>> > > > > settings, but on the CA3140 I always measure 0.56 V on pin
>2
>> and
>> > > 1.1
>> > > > > V on pin 6 regardless of the frequency setting. Would this
>> > > indicate
>> > > > > a faillure on the CA3140 or the LM394 ?
>> > > > > thanks !
>> > > > > steven
>> > > > >
>> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
>> > > > > >
>> > > > > > Test #1 - feel if any chip is getting hot. If it is,
>> replace
>> > > it.
>> > > > > >
>> > > > > > Ken
>> > > > > >
>> > > > > > >when i wanted to test my bin-n-tic, i incidently
>switched
>> +
>> > > and -
>> > > > > > >power supply. after i fixed the problem, I have no sound
>> > > > > whatsoever.
>> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
>> > > > > > >Is there any part(s) that is the most likely to be
>> damaged ?
>> > > > > > >thx,
>> > > > > > >steven
>> > > > > > >
>> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
><6079smith@>
>> > > wrote:
>> > > > > > >>
>> > > > > > >> yes, i noticed the diode and put in a jumper... but
>> still no
>> > > > > joy. i
>> > > > > > >> don't have a scope (yet) but the voltage on pin six
>of
>> the
>> > > > > ca3140
>> > > > > > >is
>> > > > > > >> just under 1 volt. with an audio probe i can (barely)
>> hear
>> > > a cv
>> > > > > > >click.
>> > > > > > >> so the vco is not oscillating. i can't figure out why
>> the
>> > > 2n2
>> > > > > > >> capacitor seems to be shorted... there's no
>resistance
>> > > between
>> > > > > the
>> > > > > > >> source and drain of the fet. nothing is physically
>> shorted.
>> > > a
>> > > > > dead
>> > > > > > >> fet? any ideas?
>> > > > > > >> andrew.
>> > > > > > >>
>> > > > > > >
>> > > > > > >
>> > > > > > >
>> > > > > > >
>> > > > > > >
>> > > > > > >The CGS Modular Synth home page:
>http://www.cgs.synth.net/
>> > > > > > >
>> > > > > > >Yahoo! Groups Links
>> > > > > > >
>> > > > > > >
>> > > > > > >
>> > > > > > >
>> > > > > > >
>> > > > > >
>> > > > > __________________________________________________________
>> > > > > __
>> > > > > > Ken Stone sasami@
>> > > > > > Modular Synth PCBs for sale
>> > > > > <http://www.blaze.net.au/~sasami/synth/>
>> > > > > > Australian Miniature Horses & Ponies
>> > > > > <http://www.blaze.net.au/~sasami/>
>> > > > > >
>> > > > >
>> > > > >
>> > > > >
>> > > >
>> > > >
>> > > >
>> > > > [Non-text portions of this message have been removed]
>> > > >
>> > >
>> >
>>
>
>
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>
>

--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> You should never see any voltage on pin 2 of the 3140 - it is a
summing
> node. It is a basic op-amp feedback loop. Yhe opamp devotes its
entire time
> truing to keep pins 2 and 3 at exactly the same voltage. As pin 3
is 0v, pin
> 2 will be 0v. The current through the point will of course vary as
the
> output of the op-amp fights the current drawn through the LM394
(through the
> integrating capacitor and through the FET during reset).
>
> Ken
>
> >hello,
> >no luck so far, I've replaced the 2N4391 fet, but still no
voltage
> >on pin 2 of the ca3140. I've also measured with a scope to see
what
> >is exactly the output on pin 6 of the ca3140, and it shows only a
dc
> >voltage ( 0.86 V )
> >
> >any more clues ?
> >many thanks in advance !
> >steven
> >
> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@> wrote:
> >>
> >> hey,
> >>
> >> I used a 2n4391, I have no clue how I can check if it still is
> >> working properly, so I'll try to replace this compontent to see
if
> >it
> >> makes a difference.
> >>
> >> thanks,
> >> steven
> >>
> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
wrote:
> >> >
> >> > Hi
> >> > look at the FET, what kind are you using? right way around etc
> >> > some FETS wont work in these ccts.
> >> > Andrew
> >> >
> >> >
> >> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> >wrote:
> >> > >
> >> > > unfortunately my bintic filter is still not working...
> >> > > I've replaced the tl072, ca3140 and the lm394, but still
the
> >> > > oscillator part is not working as expected.
> >> > > I've noticed that depending on the setting of the frequency
> >> coarse
> >> > > pot, I have different readings on the circuit.
> >> > > I've added here a link to a part of the circuit diagram
where
> >> I've
> >> > > indicated some measurements done in both minimum and
maximum
> >> > > position of the frequency coarse potmeter. I hope somebody
can
> >> give
> >> > > me clue where more or less the problem should be with this
> >data.
> >> > > Thanks a lot in advance, you can find the drawing here :
> >> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> >> > >
> >> > > steven
> >> > >
> >> > >
> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@> wrote:
> >> > > >
> >> > > > one thing to keep in mind is that CA3140s are super
delicate
> >> ICs.
> >> > > > They are very sensitive to static, but it wouldn't
surprise
> >me
> >> if
> >> > > > hooking up power in reverse was too much for it to handle.
> >> > > >
> >> > > > Romeo
> >> > > >
> >> > > >
> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> >> > > >
> >> > > > > No chips are hot ( and nothing smells burned )
> >> > > > > The TL072 seems to working fine, output 7 follows the
> >> frequency
> >> > > > > settings, but on the CA3140 I always measure 0.56 V on
pin
> >2
> >> and
> >> > > 1.1
> >> > > > > V on pin 6 regardless of the frequency setting. Would
this
> >> > > indicate
> >> > > > > a faillure on the CA3140 or the LM394 ?
> >> > > > > thanks !
> >> > > > > steven
> >> > > > >
> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >> > > > > >
> >> > > > > > Test #1 - feel if any chip is getting hot. If it is,
> >> replace
> >> > > it.
> >> > > > > >
> >> > > > > > Ken
> >> > > > > >
> >> > > > > > >when i wanted to test my bin-n-tic, i incidently
> >switched
> >> +
> >> > > and -
> >> > > > > > >power supply. after i fixed the problem, I have no
sound
> >> > > > > whatsoever.
> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> >> > > > > > >Is there any part(s) that is the most likely to be
> >> damaged ?
> >> > > > > > >thx,
> >> > > > > > >steven
> >> > > > > > >
> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> ><6079smith@>
> >> > > wrote:
> >> > > > > > >>
> >> > > > > > >> yes, i noticed the diode and put in a jumper...
but
> >> still no
> >> > > > > joy. i
> >> > > > > > >> don't have a scope (yet) but the voltage on pin
six
> >of
> >> the
> >> > > > > ca3140
> >> > > > > > >is
> >> > > > > > >> just under 1 volt. with an audio probe i can
(barely)
> >> hear
> >> > > a cv
> >> > > > > > >click.
> >> > > > > > >> so the vco is not oscillating. i can't figure out
why
> >> the
> >> > > 2n2
> >> > > > > > >> capacitor seems to be shorted... there's no
> >resistance
> >> > > between
> >> > > > > the
> >> > > > > > >> source and drain of the fet. nothing is physically
> >> shorted.
> >> > > a
> >> > > > > dead
> >> > > > > > >> fet? any ideas?
> >> > > > > > >> andrew.
> >> > > > > > >>
> >> > > > > > >
> >> > > > > > >
> >> > > > > > >
> >> > > > > > >
> >> > > > > > >
> >> > > > > > >The CGS Modular Synth home page:
> >http://www.cgs.synth.net/
> >> > > > > > >
> >> > > > > > >Yahoo! Groups Links
> >> > > > > > >
> >> > > > > > >
> >> > > > > > >
> >> > > > > > >
> >> > > > > > >
> >> > > > > >
> >> > > > >
__________________________________________________________
> >> > > > > __
> >> > > > > > Ken Stone sasami@
> >> > > > > > Modular Synth PCBs for sale
> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> >> > > > > > Australian Miniature Horses & Ponies
> >> > > > > <http://www.blaze.net.au/~sasami/>
> >> > > > > >
> >> > > > >
> >> > > > >
> >> > > > >
> >> > > >
> >> > > >
> >> > > >
> >> > > > [Non-text portions of this message have been removed]
> >> > > >
> >> > >
> >> >
> >>
> >
> >
> >
> >
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
>
_____________________________________________________________________
__
> Ken Stone sasami@...
> Modular Synth PCBs for sale
<http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>
>

>So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
>powersupply, it should create some AC voltage on pin 6 ?
>I have only a DC voltage that varies between 0 & 0.86 VDC (depending
>on the position of the coarse frequency pot )
>
>thanks again for your help !
>steven
>
>--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>>
>> You should never see any voltage on pin 2 of the 3140 - it is a
>summing
>> node. It is a basic op-amp feedback loop. Yhe opamp devotes its
>entire time
>> truing to keep pins 2 and 3 at exactly the same voltage. As pin 3
>is 0v, pin
>> 2 will be 0v. The current through the point will of course vary as
>the
>> output of the op-amp fights the current drawn through the LM394
>(through the
>> integrating capacitor and through the FET during reset).
>>
>> Ken
>>
>> >hello,
>> >no luck so far, I've replaced the 2N4391 fet, but still no
>voltage
>> >on pin 2 of the ca3140. I've also measured with a scope to see
>what
>> >is exactly the output on pin 6 of the ca3140, and it shows only a
>dc
>> >voltage ( 0.86 V )
>> >
>> >any more clues ?
>> >many thanks in advance !
>> >steven
>> >
>> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@> wrote:
>> >>
>> >> hey,
>> >>
>> >> I used a 2n4391, I have no clue how I can check if it still is
>> >> working properly, so I'll try to replace this compontent to see
>if
>> >it
>> >> makes a difference.
>> >>
>> >> thanks,
>> >> steven
>> >>
>> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
>wrote:
>> >> >
>> >> > Hi
>> >> > look at the FET, what kind are you using? right way around etc
>> >> > some FETS wont work in these ccts.
>> >> > Andrew
>> >> >
>> >> >
>> >> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
>> >wrote:
>> >> > >
>> >> > > unfortunately my bintic filter is still not working...
>> >> > > I've replaced the tl072, ca3140 and the lm394, but still
>the
>> >> > > oscillator part is not working as expected.
>> >> > > I've noticed that depending on the setting of the frequency
>> >> coarse
>> >> > > pot, I have different readings on the circuit.
>> >> > > I've added here a link to a part of the circuit diagram
>where
>> >> I've
>> >> > > indicated some measurements done in both minimum and
>maximum
>> >> > > position of the frequency coarse potmeter. I hope somebody
>can
>> >> give
>> >> > > me clue where more or less the problem should be with this
>> >data.
>> >> > > Thanks a lot in advance, you can find the drawing here :
>> >> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
>> >> > >
>> >> > > steven
>> >> > >
>> >> > >
>> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@> wrote:
>> >> > > >
>> >> > > > one thing to keep in mind is that CA3140s are super
>delicate
>> >> ICs.
>> >> > > > They are very sensitive to static, but it wouldn't
>surprise
>> >me
>> >> if
>> >> > > > hooking up power in reverse was too much for it to handle.
>> >> > > >
>> >> > > > Romeo
>> >> > > >
>> >> > > >
>> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
>> >> > > >
>> >> > > > > No chips are hot ( and nothing smells burned )
>> >> > > > > The TL072 seems to working fine, output 7 follows the
>> >> frequency
>> >> > > > > settings, but on the CA3140 I always measure 0.56 V on
>pin
>> >2
>> >> and
>> >> > > 1.1
>> >> > > > > V on pin 6 regardless of the frequency setting. Would
>this
>> >> > > indicate
>> >> > > > > a faillure on the CA3140 or the LM394 ?
>> >> > > > > thanks !
>> >> > > > > steven
>> >> > > > >
>> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
>> >> > > > > >
>> >> > > > > > Test #1 - feel if any chip is getting hot. If it is,
>> >> replace
>> >> > > it.
>> >> > > > > >
>> >> > > > > > Ken
>> >> > > > > >
>> >> > > > > > >when i wanted to test my bin-n-tic, i incidently
>> >switched
>> >> +
>> >> > > and -
>> >> > > > > > >power supply. after i fixed the problem, I have no
>sound
>> >> > > > > whatsoever.
>> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
>> >> > > > > > >Is there any part(s) that is the most likely to be
>> >> damaged ?
>> >> > > > > > >thx,
>> >> > > > > > >steven
>> >> > > > > > >
>> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
>> ><6079smith@>
>> >> > > wrote:
>> >> > > > > > >>
>> >> > > > > > >> yes, i noticed the diode and put in a jumper...
>but
>> >> still no
>> >> > > > > joy. i
>> >> > > > > > >> don't have a scope (yet) but the voltage on pin
>six
>> >of
>> >> the
>> >> > > > > ca3140
>> >> > > > > > >is
>> >> > > > > > >> just under 1 volt. with an audio probe i can
>(barely)
>> >> hear
>> >> > > a cv
>> >> > > > > > >click.
>> >> > > > > > >> so the vco is not oscillating. i can't figure out
>why
>> >> the
>> >> > > 2n2
>> >> > > > > > >> capacitor seems to be shorted... there's no
>> >resistance
>> >> > > between
>> >> > > > > the
>> >> > > > > > >> source and drain of the fet. nothing is physically
>> >> shorted.
>> >> > > a
>> >> > > > > dead
>> >> > > > > > >> fet? any ideas?
>> >> > > > > > >> andrew.
>> >> > > > > > >>
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > > >The CGS Modular Synth home page:
>> >http://www.cgs.synth.net/
>> >> > > > > > >
>> >> > > > > > >Yahoo! Groups Links
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > > >
>> >> > > > > >
>> >> > > > >
>__________________________________________________________
>> >> > > > > __
>> >> > > > > > Ken Stone sasami@
>> >> > > > > > Modular Synth PCBs for sale
>> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
>> >> > > > > > Australian Miniature Horses & Ponies
>> >> > > > > <http://www.blaze.net.au/~sasami/>
>> >> > > > > >
>> >> > > > >
>> >> > > > >
>> >> > > > >
>> >> > > >
>> >> > > >
>> >> > > >
>> >> > > > [Non-text portions of this message have been removed]
>> >> > > >
>> >> > >
>> >> >
>> >>
>> >
>> >
>> >
>> >
>> >
>> >The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >
>> >Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> >
>>
>_____________________________________________________________________
>__
>> Ken Stone sasami@...
>> Modular Synth PCBs for sale
><http://www.blaze.net.au/~sasami/synth/>
>> Australian Miniature Horses & Ponies
><http://www.blaze.net.au/~sasami/>
>>
>
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>

--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Check your capacitor too. Make sure it is the right size. Make sure
it is
> actually soldered in - no bad joints, or not between the wrong
holes. there
> is a spare hole there to allow for different sizes. If you have the cap
> between two the holes that are joined by the trackwork, it isn't
going to work.
>
> Also note that the pin-outs of different FETs varies. If I use the
2n4091, I
> need to install it "backwards" to the marking on the PCB.
>
> Ken
>
> >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> >powersupply, it should create some AC voltage on pin 6 ?
> >I have only a DC voltage that varies between 0 & 0.86 VDC (depending
> >on the position of the coarse frequency pot )
> >
> >thanks again for your help !
> >steven
> >
> >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >>
> >> You should never see any voltage on pin 2 of the 3140 - it is a
> >summing
> >> node. It is a basic op-amp feedback loop. Yhe opamp devotes its
> >entire time
> >> truing to keep pins 2 and 3 at exactly the same voltage. As pin 3
> >is 0v, pin
> >> 2 will be 0v. The current through the point will of course vary as
> >the
> >> output of the op-amp fights the current drawn through the LM394
> >(through the
> >> integrating capacitor and through the FET during reset).
> >>
> >> Ken
> >>
> >> >hello,
> >> >no luck so far, I've replaced the 2N4391 fet, but still no
> >voltage
> >> >on pin 2 of the ca3140. I've also measured with a scope to see
> >what
> >> >is exactly the output on pin 6 of the ca3140, and it shows only a
> >dc
> >> >voltage ( 0.86 V )
> >> >
> >> >any more clues ?
> >> >many thanks in advance !
> >> >steven
> >> >
> >> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@> wrote:
> >> >>
> >> >> hey,
> >> >>
> >> >> I used a 2n4391, I have no clue how I can check if it still is
> >> >> working properly, so I'll try to replace this compontent to see
> >if
> >> >it
> >> >> makes a difference.
> >> >>
> >> >> thanks,
> >> >> steven
> >> >>
> >> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
> >wrote:
> >> >> >
> >> >> > Hi
> >> >> > look at the FET, what kind are you using? right way around etc
> >> >> > some FETS wont work in these ccts.
> >> >> > Andrew
> >> >> >
> >> >> >
> >> >> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> >> >wrote:
> >> >> > >
> >> >> > > unfortunately my bintic filter is still not working...
> >> >> > > I've replaced the tl072, ca3140 and the lm394, but still
> >the
> >> >> > > oscillator part is not working as expected.
> >> >> > > I've noticed that depending on the setting of the frequency
> >> >> coarse
> >> >> > > pot, I have different readings on the circuit.
> >> >> > > I've added here a link to a part of the circuit diagram
> >where
> >> >> I've
> >> >> > > indicated some measurements done in both minimum and
> >maximum
> >> >> > > position of the frequency coarse potmeter. I hope somebody
> >can
> >> >> give
> >> >> > > me clue where more or less the problem should be with this
> >> >data.
> >> >> > > Thanks a lot in advance, you can find the drawing here :
> >> >> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> >> >> > >
> >> >> > > steven
> >> >> > >
> >> >> > >
> >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@> wrote:
> >> >> > > >
> >> >> > > > one thing to keep in mind is that CA3140s are super
> >delicate
> >> >> ICs.
> >> >> > > > They are very sensitive to static, but it wouldn't
> >surprise
> >> >me
> >> >> if
> >> >> > > > hooking up power in reverse was too much for it to handle.
> >> >> > > >
> >> >> > > > Romeo
> >> >> > > >
> >> >> > > >
> >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> >> >> > > >
> >> >> > > > > No chips are hot ( and nothing smells burned )
> >> >> > > > > The TL072 seems to working fine, output 7 follows the
> >> >> frequency
> >> >> > > > > settings, but on the CA3140 I always measure 0.56 V on
> >pin
> >> >2
> >> >> and
> >> >> > > 1.1
> >> >> > > > > V on pin 6 regardless of the frequency setting. Would
> >this
> >> >> > > indicate
> >> >> > > > > a faillure on the CA3140 or the LM394 ?
> >> >> > > > > thanks !
> >> >> > > > > steven
> >> >> > > > >
> >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >> >> > > > > >
> >> >> > > > > > Test #1 - feel if any chip is getting hot. If it is,
> >> >> replace
> >> >> > > it.
> >> >> > > > > >
> >> >> > > > > > Ken
> >> >> > > > > >
> >> >> > > > > > >when i wanted to test my bin-n-tic, i incidently
> >> >switched
> >> >> +
> >> >> > > and -
> >> >> > > > > > >power supply. after i fixed the problem, I have no
> >sound
> >> >> > > > > whatsoever.
> >> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> >> >> > > > > > >Is there any part(s) that is the most likely to be
> >> >> damaged ?
> >> >> > > > > > >thx,
> >> >> > > > > > >steven
> >> >> > > > > > >
> >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> >> ><6079smith@>
> >> >> > > wrote:
> >> >> > > > > > >>
> >> >> > > > > > >> yes, i noticed the diode and put in a jumper...
> >but
> >> >> still no
> >> >> > > > > joy. i
> >> >> > > > > > >> don't have a scope (yet) but the voltage on pin
> >six
> >> >of
> >> >> the
> >> >> > > > > ca3140
> >> >> > > > > > >is
> >> >> > > > > > >> just under 1 volt. with an audio probe i can
> >(barely)
> >> >> hear
> >> >> > > a cv
> >> >> > > > > > >click.
> >> >> > > > > > >> so the vco is not oscillating. i can't figure out
> >why
> >> >> the
> >> >> > > 2n2
> >> >> > > > > > >> capacitor seems to be shorted... there's no
> >> >resistance
> >> >> > > between
> >> >> > > > > the
> >> >> > > > > > >> source and drain of the fet. nothing is physically
> >> >> shorted.
> >> >> > > a
> >> >> > > > > dead
> >> >> > > > > > >> fet? any ideas?
> >> >> > > > > > >> andrew.
> >> >> > > > > > >>
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > > >The CGS Modular Synth home page:
> >> >http://www.cgs.synth.net/
> >> >> > > > > > >
> >> >> > > > > > >Yahoo! Groups Links
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > > >
> >> >> > > > > >
> >> >> > > > >
> >__________________________________________________________
> >> >> > > > > __
> >> >> > > > > > Ken Stone sasami@
> >> >> > > > > > Modular Synth PCBs for sale
> >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> >> >> > > > > > Australian Miniature Horses & Ponies
> >> >> > > > > <http://www.blaze.net.au/~sasami/>
> >> >> > > > > >
> >> >> > > > >
> >> >> > > > >
> >> >> > > > >
> >> >> > > >
> >> >> > > >
> >> >> > > >
> >> >> > > > [Non-text portions of this message have been removed]
> >> >> > > >
> >> >> > >
> >> >> >
> >> >>
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >> >
> >> >Yahoo! Groups Links
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >_____________________________________________________________________
> >__
> >> Ken Stone sasami@
> >> Modular Synth PCBs for sale
> ><http://www.blaze.net.au/~sasami/synth/>
> >> Australian Miniature Horses & Ponies
> ><http://www.blaze.net.au/~sasami/>
> >>
> >
> >
> >
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>

On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:

> I just read through this old thread because I have a similar problem
> with my Bi-n-Tic. I can get a filter sweep out of the last 20% or so
> of the bandwidth knob, but the tuning knobs do nothing. This leads me
> to believe that the center frequency is stuck somewhere below the
> audio range. So, I check the oscillator section. I also have a slight
> amount of DC on pin6 of CA3140, so it isn't oscillating. I also have
> voltage on pin 2, which is supposed to be at 0. Then, I start at the
> beginning and try to figure out what is wrong. I can find no faults in
> the CV summing section, yet I only get between -.8 and barely above 0v
> depending on the coarse tune pot. Is this correct? Also, I am not
> getting +15 on pin 1 of the LM311 like it shows on the schematic. The
> datasheet tells me this is a ground pin, so I'm not sure how important
> this is. I'm using a PN4391 fet and I matched the G, S and D on the
> PCB with the pinout on the fairchild datasheet. One last thing to note
> is that I'm using the bridechamber PCB. I didn't know what to do about
> the 100k resistor marked with a star, so I installed, then removed it
> afterwards.
>
> I'm stumped at this point, so any hints would be greatly appreciated.
>
> --- In cgs_synth@yahoogroups.com, sasami@... wrote:
> >
> > Check your capacitor too. Make sure it is the right size. Make sure
> it is
> > actually soldered in - no bad joints, or not between the wrong
> holes. there
> > is a spare hole there to allow for different sizes. If you have the
> cap
> > between two the holes that are joined by the trackwork, it isn't
> going to work.
> >
> > Also note that the pin-outs of different FETs varies. If I use the
> 2n4091, I
> > need to install it "backwards" to the marking on the PCB.
> >
> > Ken
> >
> > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> > >powersupply, it should create some AC voltage on pin 6 ?
> > >I have only a DC voltage that varies between 0 & 0.86 VDC
> (depending
> > >on the position of the coarse frequency pot )
> > >
> > >thanks again for your help !
> > >steven
> > >
> > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > >>
> > >> You should never see any voltage on pin 2 of the 3140 - it is a
> > >summing
> > >> node. It is a basic op-amp feedback loop. Yhe opamp devotes its
> > >entire time
> > >> truing to keep pins 2 and 3 at exactly the same voltage. As pin 3
> > >is 0v, pin
> > >> 2 will be 0v. The current through the point will of course vary
> as
> > >the
> > >> output of the op-amp fights the current drawn through the LM394
> > >(through the
> > >> integrating capacitor and through the FET during reset).
> > >>
> > >> Ken
> > >>
> > >> >hello,
> > >> >no luck so far, I've replaced the 2N4391 fet, but still no
> > >voltage
> > >> >on pin 2 of the ca3140. I've also measured with a scope to see
> > >what
> > >> >is exactly the output on pin 6 of the ca3140, and it shows only
> a
> > >dc
> > >> >voltage ( 0.86 V )
> > >> >
> > >> >any more clues ?
> > >> >many thanks in advance !
> > >> >steven
> > >> >
> > >> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> wrote:
> > >> >>
> > >> >> hey,
> > >> >>
> > >> >> I used a 2n4391, I have no clue how I can check if it still is
> > >> >> working properly, so I'll try to replace this compontent to
> see
> > >if
> > >> >it
> > >> >> makes a difference.
> > >> >>
> > >> >> thanks,
> > >> >> steven
> > >> >>
> > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
> > >wrote:
> > >> >> >
> > >> >> > Hi
> > >> >> > look at the FET, what kind are you using? right way around
> etc
> > >> >> > some FETS wont work in these ccts.
> > >> >> > Andrew
> > >> >> >
> > >> >> >
> > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> > >> >wrote:
> > >> >> > >
> > >> >> > > unfortunately my bintic filter is still not working...
> > >> >> > > I've replaced the tl072, ca3140 and the lm394, but still
> > >the
> > >> >> > > oscillator part is not working as expected.
> > >> >> > > I've noticed that depending on the setting of the
> frequency
> > >> >> coarse
> > >> >> > > pot, I have different readings on the circuit.
> > >> >> > > I've added here a link to a part of the circuit diagram
> > >where
> > >> >> I've
> > >> >> > > indicated some measurements done in both minimum and
> > >maximum
> > >> >> > > position of the frequency coarse potmeter. I hope somebody
> > >can
> > >> >> give
> > >> >> > > me clue where more or less the problem should be with this
> > >> >data.
> > >> >> > > Thanks a lot in advance, you can find the drawing here :
> > >> >> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > >> >> > >
> > >> >> > > steven
> > >> >> > >
> > >> >> > >
> > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@>
> wrote:
> > >> >> > > >
> > >> >> > > > one thing to keep in mind is that CA3140s are super
> > >delicate
> > >> >> ICs.
> > >> >> > > > They are very sensitive to static, but it wouldn't
> > >surprise
> > >> >me
> > >> >> if
> > >> >> > > > hooking up power in reverse was too much for it to
> handle.
> > >> >> > > >
> > >> >> > > > Romeo
> > >> >> > > >
> > >> >> > > >
> > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > >> >> > > >
> > >> >> > > > > No chips are hot ( and nothing smells burned )
> > >> >> > > > > The TL072 seems to working fine, output 7 follows the
> > >> >> frequency
> > >> >> > > > > settings, but on the CA3140 I always measure 0.56 V on
> > >pin
> > >> >2
> > >> >> and
> > >> >> > > 1.1
> > >> >> > > > > V on pin 6 regardless of the frequency setting. Would
> > >this
> > >> >> > > indicate
> > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > >> >> > > > > thanks !
> > >> >> > > > > steven
> > >> >> > > > >
> > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > >> >> > > > > >
> > >> >> > > > > > Test #1 - feel if any chip is getting hot. If it is,
> > >> >> replace
> > >> >> > > it.
> > >> >> > > > > >
> > >> >> > > > > > Ken
> > >> >> > > > > >
> > >> >> > > > > > >when i wanted to test my bin-n-tic, i incidently
> > >> >switched
> > >> >> +
> > >> >> > > and -
> > >> >> > > > > > >power supply. after i fixed the problem, I have no
> > >sound
> > >> >> > > > > whatsoever.
> > >> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> > >> >> > > > > > >Is there any part(s) that is the most likely to be
> > >> >> damaged ?
> > >> >> > > > > > >thx,
> > >> >> > > > > > >steven
> > >> >> > > > > > >
> > >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> > >> ><6079smith@>
> > >> >> > > wrote:
> > >> >> > > > > > >>
> > >> >> > > > > > >> yes, i noticed the diode and put in a jumper...
> > >but
> > >> >> still no
> > >> >> > > > > joy. i
> > >> >> > > > > > >> don't have a scope (yet) but the voltage on pin
> > >six
> > >> >of
> > >> >> the
> > >> >> > > > > ca3140
> > >> >> > > > > > >is
> > >> >> > > > > > >> just under 1 volt. with an audio probe i can
> > >(barely)
> > >> >> hear
> > >> >> > > a cv
> > >> >> > > > > > >click.
> > >> >> > > > > > >> so the vco is not oscillating. i can't figure out
> > >why
> > >> >> the
> > >> >> > > 2n2
> > >> >> > > > > > >> capacitor seems to be shorted... there's no
> > >> >resistance
> > >> >> > > between
> > >> >> > > > > the
> > >> >> > > > > > >> source and drain of the fet. nothing is
> physically
> > >> >> shorted.
> > >> >> > > a
> > >> >> > > > > dead
> > >> >> > > > > > >> fet? any ideas?
> > >> >> > > > > > >> andrew.
> > >> >> > > > > > >>
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > > >The CGS Modular Synth home page:
> > >> >http://www.cgs.synth.net/
> > >> >> > > > > > >
> > >> >> > > > > > >Yahoo! Groups Links
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > > >
> > >> >> > > > > >
> > >> >> > > > >
> > >__________________________________________________________
> > >> >> > > > > __
> > >> >> > > > > > Ken Stone sasami@
> > >> >> > > > > > Modular Synth PCBs for sale
> > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > >> >> > > > > > Australian Miniature Horses & Ponies
> > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > >> >> > > > > >
> > >> >> > > > >
> > >> >> > > > >
> > >> >> > > > >
> > >> >> > > >
> > >> >> > > >
> > >> >> > > >
> > >> >> > > > [Non-text portions of this message have been removed]
> > >> >> > > >
> > >> >> > >
> > >> >> >
> > >> >>
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > >> >
> > >> >Yahoo! Groups Links
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >>
> > >__________________________________________________________
> > >__
> > >> Ken Stone sasami@
> > >> Modular Synth PCBs for sale
> > ><http://www.blaze.net.au/~sasami/synth/>
> > >> Australian Miniature Horses & Ponies
> > ><http://www.blaze.net.au/~sasami/>
> > >>
> > >
> > >
> > >
> > >
> > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > >
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > __________________________________________________________
> > Ken Stone sasami@...
> > Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> > Australian Miniature Horses & Ponies
> <http://www.blaze.net.au/~sasami/>
> >
>
>
>

[Non-text portions of this message have been removed]

--- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
>
> Dang! I forgot about a little boo-boo on the PCB. Link +15V to pin 1 of
> the LM311 and you should be good to go.
> It's not connected to anything right now... sorry!
>
> Cheers,
> Scott Deyo
> The Bridechamber
> contact@...
> http://www.bridechamber.com
> Jealous Edison Record Kompany
> http://www.jealousedison.com
>
>
> On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
>
> > I just read through this old thread because I have a similar problem
> > with my Bi-n-Tic. I can get a filter sweep out of the last 20% or so
> > of the bandwidth knob, but the tuning knobs do nothing. This leads me
> > to believe that the center frequency is stuck somewhere below the
> > audio range. So, I check the oscillator section. I also have a slight
> > amount of DC on pin6 of CA3140, so it isn't oscillating. I also have
> > voltage on pin 2, which is supposed to be at 0. Then, I start at the
> > beginning and try to figure out what is wrong. I can find no
faults in
> > the CV summing section, yet I only get between -.8 and barely
above 0v
> > depending on the coarse tune pot. Is this correct? Also, I am not
> > getting +15 on pin 1 of the LM311 like it shows on the schematic. The
> > datasheet tells me this is a ground pin, so I'm not sure how
important
> > this is. I'm using a PN4391 fet and I matched the G, S and D on the
> > PCB with the pinout on the fairchild datasheet. One last thing to
note
> > is that I'm using the bridechamber PCB. I didn't know what to do
about
> > the 100k resistor marked with a star, so I installed, then removed it
> > afterwards.
> >
> > I'm stumped at this point, so any hints would be greatly appreciated.
> >
> > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > >
> > > Check your capacitor too. Make sure it is the right size. Make sure
> > it is
> > > actually soldered in - no bad joints, or not between the wrong
> > holes. there
> > > is a spare hole there to allow for different sizes. If you have
the
> > cap
> > > between two the holes that are joined by the trackwork, it isn't
> > going to work.
> > >
> > > Also note that the pin-outs of different FETs varies. If I use the
> > 2n4091, I
> > > need to install it "backwards" to the marking on the PCB.
> > >
> > > Ken
> > >
> > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> > > >powersupply, it should create some AC voltage on pin 6 ?
> > > >I have only a DC voltage that varies between 0 & 0.86 VDC
> > (depending
> > > >on the position of the coarse frequency pot )
> > > >
> > > >thanks again for your help !
> > > >steven
> > > >
> > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > >>
> > > >> You should never see any voltage on pin 2 of the 3140 - it is a
> > > >summing
> > > >> node. It is a basic op-amp feedback loop. Yhe opamp devotes its
> > > >entire time
> > > >> truing to keep pins 2 and 3 at exactly the same voltage. As
pin 3
> > > >is 0v, pin
> > > >> 2 will be 0v. The current through the point will of course vary
> > as
> > > >the
> > > >> output of the op-amp fights the current drawn through the LM394
> > > >(through the
> > > >> integrating capacitor and through the FET during reset).
> > > >>
> > > >> Ken
> > > >>
> > > >> >hello,
> > > >> >no luck so far, I've replaced the 2N4391 fet, but still no
> > > >voltage
> > > >> >on pin 2 of the ca3140. I've also measured with a scope to see
> > > >what
> > > >> >is exactly the output on pin 6 of the ca3140, and it shows
only
> > a
> > > >dc
> > > >> >voltage ( 0.86 V )
> > > >> >
> > > >> >any more clues ?
> > > >> >many thanks in advance !
> > > >> >steven
> > > >> >
> > > >> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> > wrote:
> > > >> >>
> > > >> >> hey,
> > > >> >>
> > > >> >> I used a 2n4391, I have no clue how I can check if it
still is
> > > >> >> working properly, so I'll try to replace this compontent to
> > see
> > > >if
> > > >> >it
> > > >> >> makes a difference.
> > > >> >>
> > > >> >> thanks,
> > > >> >> steven
> > > >> >>
> > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
> > > >wrote:
> > > >> >> >
> > > >> >> > Hi
> > > >> >> > look at the FET, what kind are you using? right way around
> > etc
> > > >> >> > some FETS wont work in these ccts.
> > > >> >> > Andrew
> > > >> >> >
> > > >> >> >
> > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> > > >> >wrote:
> > > >> >> > >
> > > >> >> > > unfortunately my bintic filter is still not working...
> > > >> >> > > I've replaced the tl072, ca3140 and the lm394, but still
> > > >the
> > > >> >> > > oscillator part is not working as expected.
> > > >> >> > > I've noticed that depending on the setting of the
> > frequency
> > > >> >> coarse
> > > >> >> > > pot, I have different readings on the circuit.
> > > >> >> > > I've added here a link to a part of the circuit diagram
> > > >where
> > > >> >> I've
> > > >> >> > > indicated some measurements done in both minimum and
> > > >maximum
> > > >> >> > > position of the frequency coarse potmeter. I hope
somebody
> > > >can
> > > >> >> give
> > > >> >> > > me clue where more or less the problem should be with
this
> > > >> >data.
> > > >> >> > > Thanks a lot in advance, you can find the drawing here :
> > > >> >> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > >> >> > >
> > > >> >> > > steven
> > > >> >> > >
> > > >> >> > >
> > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@>
> > wrote:
> > > >> >> > > >
> > > >> >> > > > one thing to keep in mind is that CA3140s are super
> > > >delicate
> > > >> >> ICs.
> > > >> >> > > > They are very sensitive to static, but it wouldn't
> > > >surprise
> > > >> >me
> > > >> >> if
> > > >> >> > > > hooking up power in reverse was too much for it to
> > handle.
> > > >> >> > > >
> > > >> >> > > > Romeo
> > > >> >> > > >
> > > >> >> > > >
> > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > >> >> > > >
> > > >> >> > > > > No chips are hot ( and nothing smells burned )
> > > >> >> > > > > The TL072 seems to working fine, output 7 follows the
> > > >> >> frequency
> > > >> >> > > > > settings, but on the CA3140 I always measure 0.56
V on
> > > >pin
> > > >> >2
> > > >> >> and
> > > >> >> > > 1.1
> > > >> >> > > > > V on pin 6 regardless of the frequency setting. Would
> > > >this
> > > >> >> > > indicate
> > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > >> >> > > > > thanks !
> > > >> >> > > > > steven
> > > >> >> > > > >
> > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > >> >> > > > > >
> > > >> >> > > > > > Test #1 - feel if any chip is getting hot. If
it is,
> > > >> >> replace
> > > >> >> > > it.
> > > >> >> > > > > >
> > > >> >> > > > > > Ken
> > > >> >> > > > > >
> > > >> >> > > > > > >when i wanted to test my bin-n-tic, i incidently
> > > >> >switched
> > > >> >> +
> > > >> >> > > and -
> > > >> >> > > > > > >power supply. after i fixed the problem, I have no
> > > >sound
> > > >> >> > > > > whatsoever.
> > > >> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> > > >> >> > > > > > >Is there any part(s) that is the most likely to be
> > > >> >> damaged ?
> > > >> >> > > > > > >thx,
> > > >> >> > > > > > >steven
> > > >> >> > > > > > >
> > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> > > >> ><6079smith@>
> > > >> >> > > wrote:
> > > >> >> > > > > > >>
> > > >> >> > > > > > >> yes, i noticed the diode and put in a jumper...
> > > >but
> > > >> >> still no
> > > >> >> > > > > joy. i
> > > >> >> > > > > > >> don't have a scope (yet) but the voltage on pin
> > > >six
> > > >> >of
> > > >> >> the
> > > >> >> > > > > ca3140
> > > >> >> > > > > > >is
> > > >> >> > > > > > >> just under 1 volt. with an audio probe i can
> > > >(barely)
> > > >> >> hear
> > > >> >> > > a cv
> > > >> >> > > > > > >click.
> > > >> >> > > > > > >> so the vco is not oscillating. i can't
figure out
> > > >why
> > > >> >> the
> > > >> >> > > 2n2
> > > >> >> > > > > > >> capacitor seems to be shorted... there's no
> > > >> >resistance
> > > >> >> > > between
> > > >> >> > > > > the
> > > >> >> > > > > > >> source and drain of the fet. nothing is
> > physically
> > > >> >> shorted.
> > > >> >> > > a
> > > >> >> > > > > dead
> > > >> >> > > > > > >> fet? any ideas?
> > > >> >> > > > > > >> andrew.
> > > >> >> > > > > > >>
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >The CGS Modular Synth home page:
> > > >> >http://www.cgs.synth.net/
> > > >> >> > > > > > >
> > > >> >> > > > > > >Yahoo! Groups Links
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > >
> > > >> >> > > > >
> > > >__________________________________________________________
> > > >> >> > > > > __
> > > >> >> > > > > > Ken Stone sasami@
> > > >> >> > > > > > Modular Synth PCBs for sale
> > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > >> >> > > > > >
> > > >> >> > > > >
> > > >> >> > > > >
> > > >> >> > > > >
> > > >> >> > > >
> > > >> >> > > >
> > > >> >> > > >
> > > >> >> > > > [Non-text portions of this message have been removed]
> > > >> >> > > >
> > > >> >> > >
> > > >> >> >
> > > >> >>
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > >> >
> > > >> >Yahoo! Groups Links
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >>
> > > >__________________________________________________________
> > > >__
> > > >> Ken Stone sasami@
> > > >> Modular Synth PCBs for sale
> > > ><http://www.blaze.net.au/~sasami/synth/>
> > > >> Australian Miniature Horses & Ponies
> > > ><http://www.blaze.net.au/~sasami/>
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > >
> > > >Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > __________________________________________________________
> > > Ken Stone sasami@
> > > Modular Synth PCBs for sale
<http://www.blaze.net.au/~sasami/synth/>
> > > Australian Miniature Horses & Ponies
> > <http://www.blaze.net.au/~sasami/>
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>

>
> Ahh, thanks. Now it's oscillating alright, but really high pitched and
> not affecting the filter section. I guess this means I have a
> 4024-based problem. I'll look into it and collect some more data in
> case I still need help.
>
> --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> >
> > Dang! I forgot about a little boo-boo on the PCB. Link +15V to pin

> > the LM311 and you should be good to go.
> > It's not connected to anything right now... sorry!
> >
> > Cheers,
> > Scott Deyo
> > The Bridechamber
> > contact@
> > http://www.bridechamber.com
> > Jealous Edison Record Kompany
> > http://www.jealousedison.com
> >
> >
> > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> >
> > > I just read through this old thread because I have a similar problem
> > > with my Bi-n-Tic. I can get a filter sweep out of the last 20%

> > > of the bandwidth knob, but the tuning knobs do nothing. This

> > > to believe that the center frequency is stuck somewhere below the
> > > audio range. So, I check the oscillator section. I also have a

> > > amount of DC on pin6 of CA3140, so it isn't oscillating. I also

> > > voltage on pin 2, which is supposed to be at 0. Then, I start

> > > beginning and try to figure out what is wrong. I can find no
> faults in
> > > the CV summing section, yet I only get between -.8 and barely
> above 0v
> > > depending on the coarse tune pot. Is this correct? Also, I am not
> > > getting +15 on pin 1 of the LM311 like it shows on the

> > > datasheet tells me this is a ground pin, so I'm not sure how
> important
> > > this is. I'm using a PN4391 fet and I matched the G, S and D on the
> > > PCB with the pinout on the fairchild datasheet. One last thing to
> note
> > > is that I'm using the bridechamber PCB. I didn't know what to do
> about
> > > the 100k resistor marked with a star, so I installed, then

> > > afterwards.
> > >
> > > I'm stumped at this point, so any hints would be greatly

> > >
> > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > >
> > > > Check your capacitor too. Make sure it is the right size.

> > > it is
> > > > actually soldered in - no bad joints, or not between the wrong
> > > holes. there
> > > > is a spare hole there to allow for different sizes. If you have
> the
> > > cap
> > > > between two the holes that are joined by the trackwork, it isn't
> > > going to work.
> > > >
> > > > Also note that the pin-outs of different FETs varies. If I

> > > 2n4091, I
> > > > need to install it "backwards" to the marking on the PCB.
> > > >
> > > > Ken
> > > >
> > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> > > > >powersupply, it should create some AC voltage on pin 6 ?
> > > > >I have only a DC voltage that varies between 0 & 0.86 VDC
> > > (depending
> > > > >on the position of the coarse frequency pot )
> > > > >
> > > > >thanks again for your help !
> > > > >steven
> > > > >
> > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > >>
> > > > >> You should never see any voltage on pin 2 of the 3140 - it

> > > > >summing
> > > > >> node. It is a basic op-amp feedback loop. Yhe opamp

> > > > >entire time
> > > > >> truing to keep pins 2 and 3 at exactly the same voltage. As
> pin 3
> > > > >is 0v, pin
> > > > >> 2 will be 0v. The current through the point will of course

> > > as
> > > > >the
> > > > >> output of the op-amp fights the current drawn through the

> > > > >(through the
> > > > >> integrating capacitor and through the FET during reset).
> > > > >>
> > > > >> Ken
> > > > >>
> > > > >> >hello,
> > > > >> >no luck so far, I've replaced the 2N4391 fet, but still no
> > > > >voltage
> > > > >> >on pin 2 of the ca3140. I've also measured with a scope

> > > > >what
> > > > >> >is exactly the output on pin 6 of the ca3140, and it shows
> only
> > > a
> > > > >dc
> > > > >> >voltage ( 0.86 V )
> > > > >> >
> > > > >> >any more clues ?
> > > > >> >many thanks in advance !
> > > > >> >steven
> > > > >> >
> > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> > > wrote:
> > > > >> >>
> > > > >> >> hey,
> > > > >> >>
> > > > >> >> I used a 2n4391, I have no clue how I can check if it
> still is
> > > > >> >> working properly, so I'll try to replace this

> > > see
> > > > >if
> > > > >> >it
> > > > >> >> makes a difference.
> > > > >> >>
> > > > >> >> thanks,
> > > > >> >> steven
> > > > >> >>
> > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
> > > > >wrote:
> > > > >> >> >
> > > > >> >> > Hi
> > > > >> >> > look at the FET, what kind are you using? right way

> > > etc
> > > > >> >> > some FETS wont work in these ccts.
> > > > >> >> > Andrew
> > > > >> >> >
> > > > >> >> >
> > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"

> > > > >> >wrote:
> > > > >> >> > >
> > > > >> >> > > unfortunately my bintic filter is still not working...
> > > > >> >> > > I've replaced the tl072, ca3140 and the lm394, but

> > > > >the
> > > > >> >> > > oscillator part is not working as expected.
> > > > >> >> > > I've noticed that depending on the setting of the
> > > frequency
> > > > >> >> coarse
> > > > >> >> > > pot, I have different readings on the circuit.
> > > > >> >> > > I've added here a link to a part of the circuit diagram
> > > > >where
> > > > >> >> I've
> > > > >> >> > > indicated some measurements done in both minimum and
> > > > >maximum
> > > > >> >> > > position of the frequency coarse potmeter. I hope
> somebody
> > > > >can
> > > > >> >> give
> > > > >> >> > > me clue where more or less the problem should be with
> this
> > > > >> >data.
> > > > >> >> > > Thanks a lot in advance, you can find the drawing

> > > > >> >> > >

> > > > >> >> > >
> > > > >> >> > > steven
> > > > >> >> > >
> > > > >> >> > >
> > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@>
> > > wrote:
> > > > >> >> > > >
> > > > >> >> > > > one thing to keep in mind is that CA3140s are super
> > > > >delicate
> > > > >> >> ICs.
> > > > >> >> > > > They are very sensitive to static, but it wouldn't
> > > > >surprise
> > > > >> >me
> > > > >> >> if
> > > > >> >> > > > hooking up power in reverse was too much for it to
> > > handle.
> > > > >> >> > > >
> > > > >> >> > > > Romeo
> > > > >> >> > > >
> > > > >> >> > > >
> > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > >> >> > > >
> > > > >> >> > > > > No chips are hot ( and nothing smells burned )
> > > > >> >> > > > > The TL072 seems to working fine, output 7

> > > > >> >> frequency
> > > > >> >> > > > > settings, but on the CA3140 I always measure 0.56
> V on
> > > > >pin
> > > > >> >2
> > > > >> >> and
> > > > >> >> > > 1.1
> > > > >> >> > > > > V on pin 6 regardless of the frequency setting.

> > > > >this
> > > > >> >> > > indicate
> > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > >> >> > > > > thanks !
> > > > >> >> > > > > steven
> > > > >> >> > > > >
> > > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > >> >> > > > > >
> > > > >> >> > > > > > Test #1 - feel if any chip is getting hot. If
> it is,
> > > > >> >> replace
> > > > >> >> > > it.
> > > > >> >> > > > > >
> > > > >> >> > > > > > Ken
> > > > >> >> > > > > >
> > > > >> >> > > > > > >when i wanted to test my bin-n-tic, i incidently
> > > > >> >switched
> > > > >> >> +
> > > > >> >> > > and -
> > > > >> >> > > > > > >power supply. after i fixed the problem, I

> > > > >sound
> > > > >> >> > > > > whatsoever.
> > > > >> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> > > > >> >> > > > > > >Is there any part(s) that is the most likely

> > > > >> >> damaged ?
> > > > >> >> > > > > > >thx,
> > > > >> >> > > > > > >steven
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> > > > >> ><6079smith@>
> > > > >> >> > > wrote:
> > > > >> >> > > > > > >>
> > > > >> >> > > > > > >> yes, i noticed the diode and put in a

> > > > >but
> > > > >> >> still no
> > > > >> >> > > > > joy. i
> > > > >> >> > > > > > >> don't have a scope (yet) but the voltage

> > > > >six
> > > > >> >of
> > > > >> >> the
> > > > >> >> > > > > ca3140
> > > > >> >> > > > > > >is
> > > > >> >> > > > > > >> just under 1 volt. with an audio probe i can
> > > > >(barely)
> > > > >> >> hear
> > > > >> >> > > a cv
> > > > >> >> > > > > > >click.
> > > > >> >> > > > > > >> so the vco is not oscillating. i can't
> figure out
> > > > >why
> > > > >> >> the
> > > > >> >> > > 2n2
> > > > >> >> > > > > > >> capacitor seems to be shorted... there's no
> > > > >> >resistance
> > > > >> >> > > between
> > > > >> >> > > > > the
> > > > >> >> > > > > > >> source and drain of the fet. nothing is
> > > physically
> > > > >> >> shorted.
> > > > >> >> > > a
> > > > >> >> > > > > dead
> > > > >> >> > > > > > >> fet? any ideas?
> > > > >> >> > > > > > >> andrew.
> > > > >> >> > > > > > >>
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > >> >http://www.cgs.synth.net/
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >Yahoo! Groups Links
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > >
> > > > >> >> > > > >
> > > > >__________________________________________________________
> > > > >> >> > > > > __
> > > > >> >> > > > > > Ken Stone sasami@
> > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > >> >> > > > > >
> > > > >> >> > > > >
> > > > >> >> > > > >
> > > > >> >> > > > >
> > > > >> >> > > >
> > > > >> >> > > >
> > > > >> >> > > >
> > > > >> >> > > > [Non-text portions of this message have been removed]
> > > > >> >> > > >
> > > > >> >> > >
> > > > >> >> >
> > > > >> >>
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > >> >
> > > > >> >Yahoo! Groups Links
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >>
> > > > >__________________________________________________________
> > > > >__
> > > > >> Ken Stone sasami@
> > > > >> Modular Synth PCBs for sale
> > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > >> Australian Miniature Horses & Ponies
> > > > ><http://www.blaze.net.au/~sasami/>
> > > > >>
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > >
> > > > >Yahoo! Groups Links
> > > > >
> > > > >
> > > > >
> > > > >
> > > > __________________________________________________________
> > > > Ken Stone sasami@
> > > > Modular Synth PCBs for sale
> <http://www.blaze.net.au/~sasami/synth/>
> > > > Australian Miniature Horses & Ponies
> > > <http://www.blaze.net.au/~sasami/>
> > > >
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
>

--- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
>
> Dang! I forgot about a little boo-boo on the PCB. Link +15V to pin 1 of
> the LM311 and you should be good to go.
> It's not connected to anything right now... sorry!
>
> Cheers,
> Scott Deyo
> The Bridechamber
> contact@...
> http://www.bridechamber.com
> Jealous Edison Record Kompany
> http://www.jealousedison.com
>
>
> On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
>
> > I just read through this old thread because I have a similar problem
> > with my Bi-n-Tic. I can get a filter sweep out of the last 20% or so
> > of the bandwidth knob, but the tuning knobs do nothing. This leads me
> > to believe that the center frequency is stuck somewhere below the
> > audio range. So, I check the oscillator section. I also have a slight
> > amount of DC on pin6 of CA3140, so it isn't oscillating. I also have
> > voltage on pin 2, which is supposed to be at 0. Then, I start at the
> > beginning and try to figure out what is wrong. I can find no faults in
> > the CV summing section, yet I only get between -.8 and barely above 0v
> > depending on the coarse tune pot. Is this correct? Also, I am not
> > getting +15 on pin 1 of the LM311 like it shows on the schematic. The
> > datasheet tells me this is a ground pin, so I'm not sure how important
> > this is. I'm using a PN4391 fet and I matched the G, S and D on the
> > PCB with the pinout on the fairchild datasheet. One last thing to note
> > is that I'm using the bridechamber PCB. I didn't know what to do about
> > the 100k resistor marked with a star, so I installed, then removed it
> > afterwards.
> >
> > I'm stumped at this point, so any hints would be greatly appreciated.
> >
> > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > >
> > > Check your capacitor too. Make sure it is the right size. Make sure
> > it is
> > > actually soldered in - no bad joints, or not between the wrong
> > holes. there
> > > is a spare hole there to allow for different sizes. If you have the
> > cap
> > > between two the holes that are joined by the trackwork, it isn't
> > going to work.
> > >
> > > Also note that the pin-outs of different FETs varies. If I use the
> > 2n4091, I
> > > need to install it "backwards" to the marking on the PCB.
> > >
> > > Ken
> > >
> > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> > > >powersupply, it should create some AC voltage on pin 6 ?
> > > >I have only a DC voltage that varies between 0 & 0.86 VDC
> > (depending
> > > >on the position of the coarse frequency pot )
> > > >
> > > >thanks again for your help !
> > > >steven
> > > >
> > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > >>
> > > >> You should never see any voltage on pin 2 of the 3140 - it is a
> > > >summing
> > > >> node. It is a basic op-amp feedback loop. Yhe opamp devotes its
> > > >entire time
> > > >> truing to keep pins 2 and 3 at exactly the same voltage. As pin 3
> > > >is 0v, pin
> > > >> 2 will be 0v. The current through the point will of course vary
> > as
> > > >the
> > > >> output of the op-amp fights the current drawn through the LM394
> > > >(through the
> > > >> integrating capacitor and through the FET during reset).
> > > >>
> > > >> Ken
> > > >>
> > > >> >hello,
> > > >> >no luck so far, I've replaced the 2N4391 fet, but still no
> > > >voltage
> > > >> >on pin 2 of the ca3140. I've also measured with a scope to see
> > > >what
> > > >> >is exactly the output on pin 6 of the ca3140, and it shows only
> > a
> > > >dc
> > > >> >voltage ( 0.86 V )
> > > >> >
> > > >> >any more clues ?
> > > >> >many thanks in advance !
> > > >> >steven
> > > >> >
> > > >> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> > wrote:
> > > >> >>
> > > >> >> hey,
> > > >> >>
> > > >> >> I used a 2n4391, I have no clue how I can check if it still is
> > > >> >> working properly, so I'll try to replace this compontent to
> > see
> > > >if
> > > >> >it
> > > >> >> makes a difference.
> > > >> >>
> > > >> >> thanks,
> > > >> >> steven
> > > >> >>
> > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
> > > >wrote:
> > > >> >> >
> > > >> >> > Hi
> > > >> >> > look at the FET, what kind are you using? right way around
> > etc
> > > >> >> > some FETS wont work in these ccts.
> > > >> >> > Andrew
> > > >> >> >
> > > >> >> >
> > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> > > >> >wrote:
> > > >> >> > >
> > > >> >> > > unfortunately my bintic filter is still not working...
> > > >> >> > > I've replaced the tl072, ca3140 and the lm394, but still
> > > >the
> > > >> >> > > oscillator part is not working as expected.
> > > >> >> > > I've noticed that depending on the setting of the
> > frequency
> > > >> >> coarse
> > > >> >> > > pot, I have different readings on the circuit.
> > > >> >> > > I've added here a link to a part of the circuit diagram
> > > >where
> > > >> >> I've
> > > >> >> > > indicated some measurements done in both minimum and
> > > >maximum
> > > >> >> > > position of the frequency coarse potmeter. I hope somebody
> > > >can
> > > >> >> give
> > > >> >> > > me clue where more or less the problem should be with this
> > > >> >data.
> > > >> >> > > Thanks a lot in advance, you can find the drawing here :
> > > >> >> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > >> >> > >
> > > >> >> > > steven
> > > >> >> > >
> > > >> >> > >
> > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@>
> > wrote:
> > > >> >> > > >
> > > >> >> > > > one thing to keep in mind is that CA3140s are super
> > > >delicate
> > > >> >> ICs.
> > > >> >> > > > They are very sensitive to static, but it wouldn't
> > > >surprise
> > > >> >me
> > > >> >> if
> > > >> >> > > > hooking up power in reverse was too much for it to
> > handle.
> > > >> >> > > >
> > > >> >> > > > Romeo
> > > >> >> > > >
> > > >> >> > > >
> > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > >> >> > > >
> > > >> >> > > > > No chips are hot ( and nothing smells burned )
> > > >> >> > > > > The TL072 seems to working fine, output 7 follows the
> > > >> >> frequency
> > > >> >> > > > > settings, but on the CA3140 I always measure 0.56 V on
> > > >pin
> > > >> >2
> > > >> >> and
> > > >> >> > > 1.1
> > > >> >> > > > > V on pin 6 regardless of the frequency setting. Would
> > > >this
> > > >> >> > > indicate
> > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > >> >> > > > > thanks !
> > > >> >> > > > > steven
> > > >> >> > > > >
> > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > >> >> > > > > >
> > > >> >> > > > > > Test #1 - feel if any chip is getting hot. If it is,
> > > >> >> replace
> > > >> >> > > it.
> > > >> >> > > > > >
> > > >> >> > > > > > Ken
> > > >> >> > > > > >
> > > >> >> > > > > > >when i wanted to test my bin-n-tic, i incidently
> > > >> >switched
> > > >> >> +
> > > >> >> > > and -
> > > >> >> > > > > > >power supply. after i fixed the problem, I have no
> > > >sound
> > > >> >> > > > > whatsoever.
> > > >> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> > > >> >> > > > > > >Is there any part(s) that is the most likely to be
> > > >> >> damaged ?
> > > >> >> > > > > > >thx,
> > > >> >> > > > > > >steven
> > > >> >> > > > > > >
> > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> > > >> ><6079smith@>
> > > >> >> > > wrote:
> > > >> >> > > > > > >>
> > > >> >> > > > > > >> yes, i noticed the diode and put in a jumper...
> > > >but
> > > >> >> still no
> > > >> >> > > > > joy. i
> > > >> >> > > > > > >> don't have a scope (yet) but the voltage on pin
> > > >six
> > > >> >of
> > > >> >> the
> > > >> >> > > > > ca3140
> > > >> >> > > > > > >is
> > > >> >> > > > > > >> just under 1 volt. with an audio probe i can
> > > >(barely)
> > > >> >> hear
> > > >> >> > > a cv
> > > >> >> > > > > > >click.
> > > >> >> > > > > > >> so the vco is not oscillating. i can't figure out
> > > >why
> > > >> >> the
> > > >> >> > > 2n2
> > > >> >> > > > > > >> capacitor seems to be shorted... there's no
> > > >> >resistance
> > > >> >> > > between
> > > >> >> > > > > the
> > > >> >> > > > > > >> source and drain of the fet. nothing is
> > physically
> > > >> >> shorted.
> > > >> >> > > a
> > > >> >> > > > > dead
> > > >> >> > > > > > >> fet? any ideas?
> > > >> >> > > > > > >> andrew.
> > > >> >> > > > > > >>
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >The CGS Modular Synth home page:
> > > >> >http://www.cgs.synth.net/
> > > >> >> > > > > > >
> > > >> >> > > > > > >Yahoo! Groups Links
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > > >
> > > >> >> > > > > >
> > > >> >> > > > >
> > > >__________________________________________________________
> > > >> >> > > > > __
> > > >> >> > > > > > Ken Stone sasami@
> > > >> >> > > > > > Modular Synth PCBs for sale
> > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > >> >> > > > > >
> > > >> >> > > > >
> > > >> >> > > > >
> > > >> >> > > > >
> > > >> >> > > >
> > > >> >> > > >
> > > >> >> > > >
> > > >> >> > > > [Non-text portions of this message have been removed]
> > > >> >> > > >
> > > >> >> > >
> > > >> >> >
> > > >> >>
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > >> >
> > > >> >Yahoo! Groups Links
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >>
> > > >__________________________________________________________
> > > >__
> > > >> Ken Stone sasami@
> > > >> Modular Synth PCBs for sale
> > > ><http://www.blaze.net.au/~sasami/synth/>
> > > >> Australian Miniature Horses & Ponies
> > > ><http://www.blaze.net.au/~sasami/>
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > >
> > > >Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > __________________________________________________________
> > > Ken Stone sasami@
> > > Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> > > Australian Miniature Horses & Ponies
> > <http://www.blaze.net.au/~sasami/>
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>

On Oct 16, 2008, at 12:15 PM, adaaxs wrote:

> I have a rev 1.2 board. What do do about pin1 and pin 4 of the 311.
>
> --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
> >
> > Dang! I forgot about a little boo-boo on the PCB. Link +15V to pin
> 1 of
> > the LM311 and you should be good to go.
> > It's not connected to anything right now... sorry!
> >
> > Cheers,
> > Scott Deyo
> > The Bridechamber
> > contact@...
> > http://www.bridechamber.com
> > Jealous Edison Record Kompany
> > http://www.jealousedison.com
> >
> >
> > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> >
> > > I just read through this old thread because I have a similar
> problem
> > > with my Bi-n-Tic. I can get a filter sweep out of the last 20% or
> so
> > > of the bandwidth knob, but the tuning knobs do nothing. This
> leads me
> > > to believe that the center frequency is stuck somewhere below the
> > > audio range. So, I check the oscillator section. I also have a
> slight
> > > amount of DC on pin6 of CA3140, so it isn't oscillating. I also
> have
> > > voltage on pin 2, which is supposed to be at 0. Then, I start at
> the
> > > beginning and try to figure out what is wrong. I can find no
> faults in
> > > the CV summing section, yet I only get between -.8 and barely
> above 0v
> > > depending on the coarse tune pot. Is this correct? Also, I am not
> > > getting +15 on pin 1 of the LM311 like it shows on the schematic.
> The
> > > datasheet tells me this is a ground pin, so I'm not sure how
> important
> > > this is. I'm using a PN4391 fet and I matched the G, S and D on
> the
> > > PCB with the pinout on the fairchild datasheet. One last thing to
> note
> > > is that I'm using the bridechamber PCB. I didn't know what to do
> about
> > > the 100k resistor marked with a star, so I installed, then
> removed it
> > > afterwards.
> > >
> > > I'm stumped at this point, so any hints would be greatly
> appreciated.
> > >
> > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > >
> > > > Check your capacitor too. Make sure it is the right size. Make
> sure
> > > it is
> > > > actually soldered in - no bad joints, or not between the wrong
> > > holes. there
> > > > is a spare hole there to allow for different sizes. If you have
> the
> > > cap
> > > > between two the holes that are joined by the trackwork, it isn't
> > > going to work.
> > > >
> > > > Also note that the pin-outs of different FETs varies. If I use
> the
> > > 2n4091, I
> > > > need to install it "backwards" to the marking on the PCB.
> > > >
> > > > Ken
> > > >
> > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> > > > >powersupply, it should create some AC voltage on pin 6 ?
> > > > >I have only a DC voltage that varies between 0 & 0.86 VDC
> > > (depending
> > > > >on the position of the coarse frequency pot )
> > > > >
> > > > >thanks again for your help !
> > > > >steven
> > > > >
> > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > >>
> > > > >> You should never see any voltage on pin 2 of the 3140 - it
> is a
> > > > >summing
> > > > >> node. It is a basic op-amp feedback loop. Yhe opamp devotes
> its
> > > > >entire time
> > > > >> truing to keep pins 2 and 3 at exactly the same voltage. As
> pin 3
> > > > >is 0v, pin
> > > > >> 2 will be 0v. The current through the point will of course
> vary
> > > as
> > > > >the
> > > > >> output of the op-amp fights the current drawn through the
> LM394
> > > > >(through the
> > > > >> integrating capacitor and through the FET during reset).
> > > > >>
> > > > >> Ken
> > > > >>
> > > > >> >hello,
> > > > >> >no luck so far, I've replaced the 2N4391 fet, but still no
> > > > >voltage
> > > > >> >on pin 2 of the ca3140. I've also measured with a scope to
> see
> > > > >what
> > > > >> >is exactly the output on pin 6 of the ca3140, and it shows
> only
> > > a
> > > > >dc
> > > > >> >voltage ( 0.86 V )
> > > > >> >
> > > > >> >any more clues ?
> > > > >> >many thanks in advance !
> > > > >> >steven
> > > > >> >
> > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz" <theevaporizer@>
> > > wrote:
> > > > >> >>
> > > > >> >> hey,
> > > > >> >>
> > > > >> >> I used a 2n4391, I have no clue how I can check if it
> still is
> > > > >> >> working properly, so I'll try to replace this compontent
> to
> > > see
> > > > >if
> > > > >> >it
> > > > >> >> makes a difference.
> > > > >> >>
> > > > >> >> thanks,
> > > > >> >> steven
> > > > >> >>
> > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@>
> > > > >wrote:
> > > > >> >> >
> > > > >> >> > Hi
> > > > >> >> > look at the FET, what kind are you using? right way
> around
> > > etc
> > > > >> >> > some FETS wont work in these ccts.
> > > > >> >> > Andrew
> > > > >> >> >
> > > > >> >> >
> > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"
> <theevaporizer@>
> > > > >> >wrote:
> > > > >> >> > >
> > > > >> >> > > unfortunately my bintic filter is still not working...
> > > > >> >> > > I've replaced the tl072, ca3140 and the lm394, but
> still
> > > > >the
> > > > >> >> > > oscillator part is not working as expected.
> > > > >> >> > > I've noticed that depending on the setting of the
> > > frequency
> > > > >> >> coarse
> > > > >> >> > > pot, I have different readings on the circuit.
> > > > >> >> > > I've added here a link to a part of the circuit
> diagram
> > > > >where
> > > > >> >> I've
> > > > >> >> > > indicated some measurements done in both minimum and
> > > > >maximum
> > > > >> >> > > position of the frequency coarse potmeter. I hope
> somebody
> > > > >can
> > > > >> >> give
> > > > >> >> > > me clue where more or less the problem should be with
> this
> > > > >> >data.
> > > > >> >> > > Thanks a lot in advance, you can find the drawing
> here :
> > > > >> >> > >
> http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > > >> >> > >
> > > > >> >> > > steven
> > > > >> >> > >
> > > > >> >> > >
> > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl <rfahl@>
> > > wrote:
> > > > >> >> > > >
> > > > >> >> > > > one thing to keep in mind is that CA3140s are super
> > > > >delicate
> > > > >> >> ICs.
> > > > >> >> > > > They are very sensitive to static, but it wouldn't
> > > > >surprise
> > > > >> >me
> > > > >> >> if
> > > > >> >> > > > hooking up power in reverse was too much for it to
> > > handle.
> > > > >> >> > > >
> > > > >> >> > > > Romeo
> > > > >> >> > > >
> > > > >> >> > > >
> > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > >> >> > > >
> > > > >> >> > > > > No chips are hot ( and nothing smells burned )
> > > > >> >> > > > > The TL072 seems to working fine, output 7 follows
> the
> > > > >> >> frequency
> > > > >> >> > > > > settings, but on the CA3140 I always measure 0.56
> V on
> > > > >pin
> > > > >> >2
> > > > >> >> and
> > > > >> >> > > 1.1
> > > > >> >> > > > > V on pin 6 regardless of the frequency setting.
> Would
> > > > >this
> > > > >> >> > > indicate
> > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > >> >> > > > > thanks !
> > > > >> >> > > > > steven
> > > > >> >> > > > >
> > > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > >> >> > > > > >
> > > > >> >> > > > > > Test #1 - feel if any chip is getting hot. If
> it is,
> > > > >> >> replace
> > > > >> >> > > it.
> > > > >> >> > > > > >
> > > > >> >> > > > > > Ken
> > > > >> >> > > > > >
> > > > >> >> > > > > > >when i wanted to test my bin-n-tic, i
> incidently
> > > > >> >switched
> > > > >> >> +
> > > > >> >> > > and -
> > > > >> >> > > > > > >power supply. after i fixed the problem, I
> have no
> > > > >sound
> > > > >> >> > > > > whatsoever.
> > > > >> >> > > > > > >I measured 1.1 volt between pin6 of the ca3140.
> > > > >> >> > > > > > >Is there any part(s) that is the most likely
> to be
> > > > >> >> damaged ?
> > > > >> >> > > > > > >thx,
> > > > >> >> > > > > > >steven
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> > > > >> ><6079smith@>
> > > > >> >> > > wrote:
> > > > >> >> > > > > > >>
> > > > >> >> > > > > > >> yes, i noticed the diode and put in a
> jumper...
> > > > >but
> > > > >> >> still no
> > > > >> >> > > > > joy. i
> > > > >> >> > > > > > >> don't have a scope (yet) but the voltage on
> pin
> > > > >six
> > > > >> >of
> > > > >> >> the
> > > > >> >> > > > > ca3140
> > > > >> >> > > > > > >is
> > > > >> >> > > > > > >> just under 1 volt. with an audio probe i can
> > > > >(barely)
> > > > >> >> hear
> > > > >> >> > > a cv
> > > > >> >> > > > > > >click.
> > > > >> >> > > > > > >> so the vco is not oscillating. i can't
> figure out
> > > > >why
> > > > >> >> the
> > > > >> >> > > 2n2
> > > > >> >> > > > > > >> capacitor seems to be shorted... there's no
> > > > >> >resistance
> > > > >> >> > > between
> > > > >> >> > > > > the
> > > > >> >> > > > > > >> source and drain of the fet. nothing is
> > > physically
> > > > >> >> shorted.
> > > > >> >> > > a
> > > > >> >> > > > > dead
> > > > >> >> > > > > > >> fet? any ideas?
> > > > >> >> > > > > > >> andrew.
> > > > >> >> > > > > > >>
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > >> >http://www.cgs.synth.net/
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >Yahoo! Groups Links
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > > >
> > > > >> >> > > > > >
> > > > >> >> > > > >
> > > > >__________________________________________________________
> > > > >> >> > > > > __
> > > > >> >> > > > > > Ken Stone sasami@
> > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > >> >> > > > > >
> > > > >> >> > > > >
> > > > >> >> > > > >
> > > > >> >> > > > >
> > > > >> >> > > >
> > > > >> >> > > >
> > > > >> >> > > >
> > > > >> >> > > > [Non-text portions of this message have been
> removed]
> > > > >> >> > > >
> > > > >> >> > >
> > > > >> >> >
> > > > >> >>
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > >> >
> > > > >> >Yahoo! Groups Links
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >>
> > > > >__________________________________________________________
> > > > >__
> > > > >> Ken Stone sasami@
> > > > >> Modular Synth PCBs for sale
> > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > >> Australian Miniature Horses & Ponies
> > > > ><http://www.blaze.net.au/~sasami/>
> > > > >>
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > >
> > > > >Yahoo! Groups Links
> > > > >
> > > > >
> > > > >
> > > > >
> > > > __________________________________________________________
> > > > Ken Stone sasami@
> > > > Modular Synth PCBs for sale
> <http://www.blaze.net.au/~sasami/synth/>
> > > > Australian Miniature Horses & Ponies
> > > <http://www.blaze.net.au/~sasami/>
> > > >
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>

[Non-text portions of this message have been removed]

On Oct 16, 2008, at 2:06 AM, andrewlistmayer wrote:

> Doh! I just had to re-install that pesky resistor to get the filter
> clocking, but the minimum pitch of the oscillator is still very high,
> even after turning the zero trimmer all the way down.
>
> --- In cgs_synth@yahoogroups.com, "andrewlistmayer"
> <andrewlistmayer@...> wrote:
> >
> > Ahh, thanks. Now it's oscillating alright, but really high pitched
> and
> > not affecting the filter section. I guess this means I have a
> > 4024-based problem. I'll look into it and collect some more data in
> > case I still need help.
> >
> > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > >
> > > Dang! I forgot about a little boo-boo on the PCB. Link +15V to pin
> 1 of
> > > the LM311 and you should be good to go.
> > > It's not connected to anything right now... sorry!
> > >
> > > Cheers,
> > > Scott Deyo
> > > The Bridechamber
> > > contact@
> > > http://www.bridechamber.com
> > > Jealous Edison Record Kompany
> > > http://www.jealousedison.com
> > >
> > >
> > > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> > >
> > > > I just read through this old thread because I have a similar
> problem
> > > > with my Bi-n-Tic. I can get a filter sweep out of the last 20%
> or so
> > > > of the bandwidth knob, but the tuning knobs do nothing. This
> leads me
> > > > to believe that the center frequency is stuck somewhere below
> the
> > > > audio range. So, I check the oscillator section. I also have a
> slight
> > > > amount of DC on pin6 of CA3140, so it isn't oscillating. I also
> have
> > > > voltage on pin 2, which is supposed to be at 0. Then, I start
> at the
> > > > beginning and try to figure out what is wrong. I can find no
> > faults in
> > > > the CV summing section, yet I only get between -.8 and barely
> > above 0v
> > > > depending on the coarse tune pot. Is this correct? Also, I am
> not
> > > > getting +15 on pin 1 of the LM311 like it shows on the
> schematic. The
> > > > datasheet tells me this is a ground pin, so I'm not sure how
> > important
> > > > this is. I'm using a PN4391 fet and I matched the G, S and D on
> the
> > > > PCB with the pinout on the fairchild datasheet. One last thing
> to
> > note
> > > > is that I'm using the bridechamber PCB. I didn't know what to do
> > about
> > > > the 100k resistor marked with a star, so I installed, then
> removed it
> > > > afterwards.
> > > >
> > > > I'm stumped at this point, so any hints would be greatly
> appreciated.
> > > >
> > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > >
> > > > > Check your capacitor too. Make sure it is the right size.
> Make sure
> > > > it is
> > > > > actually soldered in - no bad joints, or not between the wrong
> > > > holes. there
> > > > > is a spare hole there to allow for different sizes. If you
> have
> > the
> > > > cap
> > > > > between two the holes that are joined by the trackwork, it
> isn't
> > > > going to work.
> > > > >
> > > > > Also note that the pin-outs of different FETs varies. If I
> use the
> > > > 2n4091, I
> > > > > need to install it "backwards" to the marking on the PCB.
> > > > >
> > > > > Ken
> > > > >
> > > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> > > > > >powersupply, it should create some AC voltage on pin 6 ?
> > > > > >I have only a DC voltage that varies between 0 & 0.86 VDC
> > > > (depending
> > > > > >on the position of the coarse frequency pot )
> > > > > >
> > > > > >thanks again for your help !
> > > > > >steven
> > > > > >
> > > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > >>
> > > > > >> You should never see any voltage on pin 2 of the 3140 - it
> is a
> > > > > >summing
> > > > > >> node. It is a basic op-amp feedback loop. Yhe opamp
> devotes its
> > > > > >entire time
> > > > > >> truing to keep pins 2 and 3 at exactly the same voltage. As
> > pin 3
> > > > > >is 0v, pin
> > > > > >> 2 will be 0v. The current through the point will of course
> vary
> > > > as
> > > > > >the
> > > > > >> output of the op-amp fights the current drawn through the
> LM394
> > > > > >(through the
> > > > > >> integrating capacitor and through the FET during reset).
> > > > > >>
> > > > > >> Ken
> > > > > >>
> > > > > >> >hello,
> > > > > >> >no luck so far, I've replaced the 2N4391 fet, but still no
> > > > > >voltage
> > > > > >> >on pin 2 of the ca3140. I've also measured with a scope
> to see
> > > > > >what
> > > > > >> >is exactly the output on pin 6 of the ca3140, and it shows
> > only
> > > > a
> > > > > >dc
> > > > > >> >voltage ( 0.86 V )
> > > > > >> >
> > > > > >> >any more clues ?
> > > > > >> >many thanks in advance !
> > > > > >> >steven
> > > > > >> >
> > > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz"
> <theevaporizer@>
> > > > wrote:
> > > > > >> >>
> > > > > >> >> hey,
> > > > > >> >>
> > > > > >> >> I used a 2n4391, I have no clue how I can check if it
> > still is
> > > > > >> >> working properly, so I'll try to replace this
> compontent to
> > > > see
> > > > > >if
> > > > > >> >it
> > > > > >> >> makes a difference.
> > > > > >> >>
> > > > > >> >> thanks,
> > > > > >> >> steven
> > > > > >> >>
> > > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang"
> <jumpswine@>
> > > > > >wrote:
> > > > > >> >> >
> > > > > >> >> > Hi
> > > > > >> >> > look at the FET, what kind are you using? right way
> around
> > > > etc
> > > > > >> >> > some FETS wont work in these ccts.
> > > > > >> >> > Andrew
> > > > > >> >> >
> > > > > >> >> >
> > > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"
> <theevaporizer@>
> > > > > >> >wrote:
> > > > > >> >> > >
> > > > > >> >> > > unfortunately my bintic filter is still not
> working...
> > > > > >> >> > > I've replaced the tl072, ca3140 and the lm394, but
> still
> > > > > >the
> > > > > >> >> > > oscillator part is not working as expected.
> > > > > >> >> > > I've noticed that depending on the setting of the
> > > > frequency
> > > > > >> >> coarse
> > > > > >> >> > > pot, I have different readings on the circuit.
> > > > > >> >> > > I've added here a link to a part of the circuit
> diagram
> > > > > >where
> > > > > >> >> I've
> > > > > >> >> > > indicated some measurements done in both minimum and
> > > > > >maximum
> > > > > >> >> > > position of the frequency coarse potmeter. I hope
> > somebody
> > > > > >can
> > > > > >> >> give
> > > > > >> >> > > me clue where more or less the problem should be
> with
> > this
> > > > > >> >data.
> > > > > >> >> > > Thanks a lot in advance, you can find the drawing
> here :
> > > > > >> >> > >
> http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > > > >> >> > >
> > > > > >> >> > > steven
> > > > > >> >> > >
> > > > > >> >> > >
> > > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl
> <rfahl@>
> > > > wrote:
> > > > > >> >> > > >
> > > > > >> >> > > > one thing to keep in mind is that CA3140s are
> super
> > > > > >delicate
> > > > > >> >> ICs.
> > > > > >> >> > > > They are very sensitive to static, but it wouldn't
> > > > > >surprise
> > > > > >> >me
> > > > > >> >> if
> > > > > >> >> > > > hooking up power in reverse was too much for it to
> > > > handle.
> > > > > >> >> > > >
> > > > > >> >> > > > Romeo
> > > > > >> >> > > >
> > > > > >> >> > > >
> > > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > > >> >> > > >
> > > > > >> >> > > > > No chips are hot ( and nothing smells burned )
> > > > > >> >> > > > > The TL072 seems to working fine, output 7
> follows the
> > > > > >> >> frequency
> > > > > >> >> > > > > settings, but on the CA3140 I always measure
> 0.56
> > V on
> > > > > >pin
> > > > > >> >2
> > > > > >> >> and
> > > > > >> >> > > 1.1
> > > > > >> >> > > > > V on pin 6 regardless of the frequency setting.
> Would
> > > > > >this
> > > > > >> >> > > indicate
> > > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > > >> >> > > > > thanks !
> > > > > >> >> > > > > steven
> > > > > >> >> > > > >
> > > > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > >> >> > > > > >
> > > > > >> >> > > > > > Test #1 - feel if any chip is getting hot. If
> > it is,
> > > > > >> >> replace
> > > > > >> >> > > it.
> > > > > >> >> > > > > >
> > > > > >> >> > > > > > Ken
> > > > > >> >> > > > > >
> > > > > >> >> > > > > > >when i wanted to test my bin-n-tic, i
> incidently
> > > > > >> >switched
> > > > > >> >> +
> > > > > >> >> > > and -
> > > > > >> >> > > > > > >power supply. after i fixed the problem, I
> have no
> > > > > >sound
> > > > > >> >> > > > > whatsoever.
> > > > > >> >> > > > > > >I measured 1.1 volt between pin6 of the
> ca3140.
> > > > > >> >> > > > > > >Is there any part(s) that is the most likely
> to be
> > > > > >> >> damaged ?
> > > > > >> >> > > > > > >thx,
> > > > > >> >> > > > > > >steven
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> > > > > >> ><6079smith@>
> > > > > >> >> > > wrote:
> > > > > >> >> > > > > > >>
> > > > > >> >> > > > > > >> yes, i noticed the diode and put in a
> jumper...
> > > > > >but
> > > > > >> >> still no
> > > > > >> >> > > > > joy. i
> > > > > >> >> > > > > > >> don't have a scope (yet) but the voltage
> on pin
> > > > > >six
> > > > > >> >of
> > > > > >> >> the
> > > > > >> >> > > > > ca3140
> > > > > >> >> > > > > > >is
> > > > > >> >> > > > > > >> just under 1 volt. with an audio probe i
> can
> > > > > >(barely)
> > > > > >> >> hear
> > > > > >> >> > > a cv
> > > > > >> >> > > > > > >click.
> > > > > >> >> > > > > > >> so the vco is not oscillating. i can't
> > figure out
> > > > > >why
> > > > > >> >> the
> > > > > >> >> > > 2n2
> > > > > >> >> > > > > > >> capacitor seems to be shorted... there's no
> > > > > >> >resistance
> > > > > >> >> > > between
> > > > > >> >> > > > > the
> > > > > >> >> > > > > > >> source and drain of the fet. nothing is
> > > > physically
> > > > > >> >> shorted.
> > > > > >> >> > > a
> > > > > >> >> > > > > dead
> > > > > >> >> > > > > > >> fet? any ideas?
> > > > > >> >> > > > > > >> andrew.
> > > > > >> >> > > > > > >>
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > > >> >http://www.cgs.synth.net/
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >Yahoo! Groups Links
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > > >
> > > > > >> >> > > > > >
> > > > > >> >> > > > >
> > > > > >__________________________________________________________
> > > > > >> >> > > > > __
> > > > > >> >> > > > > > Ken Stone sasami@
> > > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > >> >> > > > > >
> > > > > >> >> > > > >
> > > > > >> >> > > > >
> > > > > >> >> > > > >
> > > > > >> >> > > >
> > > > > >> >> > > >
> > > > > >> >> > > >
> > > > > >> >> > > > [Non-text portions of this message have been
> removed]
> > > > > >> >> > > >
> > > > > >> >> > >
> > > > > >> >> >
> > > > > >> >>
> > > > > >> >
> > > > > >> >
> > > > > >> >
> > > > > >> >
> > > > > >> >
> > > > > >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > > >> >
> > > > > >> >Yahoo! Groups Links
> > > > > >> >
> > > > > >> >
> > > > > >> >
> > > > > >> >
> > > > > >> >
> > > > > >>
> > > > > >__________________________________________________________
> > > > > >__
> > > > > >> Ken Stone sasami@
> > > > > >> Modular Synth PCBs for sale
> > > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > > >> Australian Miniature Horses & Ponies
> > > > > ><http://www.blaze.net.au/~sasami/>
> > > > > >>
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > > >
> > > > > >Yahoo! Groups Links
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > __________________________________________________________
> > > > > Ken Stone sasami@
> > > > > Modular Synth PCBs for sale
> > <http://www.blaze.net.au/~sasami/synth/>
> > > > > Australian Miniature Horses & Ponies
> > > > <http://www.blaze.net.au/~sasami/>
> > > > >
> > > >
> > > >
> > > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>
>
>

[Non-text portions of this message have been removed]

--- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
>
> That is strange.
> How does the filter section sound?
>
> Scott Deyo
> The Bridechamber
> contact@...
> http://www.bridechamber.com
> Jealous Edison Record Kompany
> http://www.jealousedison.com
>
>
> On Oct 16, 2008, at 2:06 AM, andrewlistmayer wrote:
>
> > Doh! I just had to re-install that pesky resistor to get the filter
> > clocking, but the minimum pitch of the oscillator is still very high,
> > even after turning the zero trimmer all the way down.
> >
> > --- In cgs_synth@yahoogroups.com, "andrewlistmayer"
> > <andrewlistmayer@> wrote:
> > >
> > > Ahh, thanks. Now it's oscillating alright, but really high pitched
> > and
> > > not affecting the filter section. I guess this means I have a
> > > 4024-based problem. I'll look into it and collect some more data in
> > > case I still need help.
> > >
> > > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > > >
> > > > Dang! I forgot about a little boo-boo on the PCB. Link +15V
to pin
> > 1 of
> > > > the LM311 and you should be good to go.
> > > > It's not connected to anything right now... sorry!
> > > >
> > > > Cheers,
> > > > Scott Deyo
> > > > The Bridechamber
> > > > contact@
> > > > http://www.bridechamber.com
> > > > Jealous Edison Record Kompany
> > > > http://www.jealousedison.com
> > > >
> > > >
> > > > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> > > >
> > > > > I just read through this old thread because I have a similar
> > problem
> > > > > with my Bi-n-Tic. I can get a filter sweep out of the last 20%
> > or so
> > > > > of the bandwidth knob, but the tuning knobs do nothing. This
> > leads me
> > > > > to believe that the center frequency is stuck somewhere below
> > the
> > > > > audio range. So, I check the oscillator section. I also have a
> > slight
> > > > > amount of DC on pin6 of CA3140, so it isn't oscillating. I also
> > have
> > > > > voltage on pin 2, which is supposed to be at 0. Then, I start
> > at the
> > > > > beginning and try to figure out what is wrong. I can find no
> > > faults in
> > > > > the CV summing section, yet I only get between -.8 and barely
> > > above 0v
> > > > > depending on the coarse tune pot. Is this correct? Also, I am
> > not
> > > > > getting +15 on pin 1 of the LM311 like it shows on the
> > schematic. The
> > > > > datasheet tells me this is a ground pin, so I'm not sure how
> > > important
> > > > > this is. I'm using a PN4391 fet and I matched the G, S and
D on
> > the
> > > > > PCB with the pinout on the fairchild datasheet. One last thing
> > to
> > > note
> > > > > is that I'm using the bridechamber PCB. I didn't know what
to do
> > > about
> > > > > the 100k resistor marked with a star, so I installed, then
> > removed it
> > > > > afterwards.
> > > > >
> > > > > I'm stumped at this point, so any hints would be greatly
> > appreciated.
> > > > >
> > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > >
> > > > > > Check your capacitor too. Make sure it is the right size.
> > Make sure
> > > > > it is
> > > > > > actually soldered in - no bad joints, or not between the
wrong
> > > > > holes. there
> > > > > > is a spare hole there to allow for different sizes. If you
> > have
> > > the
> > > > > cap
> > > > > > between two the holes that are joined by the trackwork, it
> > isn't
> > > > > going to work.
> > > > > >
> > > > > > Also note that the pin-outs of different FETs varies. If I
> > use the
> > > > > 2n4091, I
> > > > > > need to install it "backwards" to the marking on the PCB.
> > > > > >
> > > > > > Ken
> > > > > >
> > > > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets it's
> > > > > > >powersupply, it should create some AC voltage on pin 6 ?
> > > > > > >I have only a DC voltage that varies between 0 & 0.86 VDC
> > > > > (depending
> > > > > > >on the position of the coarse frequency pot )
> > > > > > >
> > > > > > >thanks again for your help !
> > > > > > >steven
> > > > > > >
> > > > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > >>
> > > > > > >> You should never see any voltage on pin 2 of the 3140 - it
> > is a
> > > > > > >summing
> > > > > > >> node. It is a basic op-amp feedback loop. Yhe opamp
> > devotes its
> > > > > > >entire time
> > > > > > >> truing to keep pins 2 and 3 at exactly the same
voltage. As
> > > pin 3
> > > > > > >is 0v, pin
> > > > > > >> 2 will be 0v. The current through the point will of course
> > vary
> > > > > as
> > > > > > >the
> > > > > > >> output of the op-amp fights the current drawn through the
> > LM394
> > > > > > >(through the
> > > > > > >> integrating capacitor and through the FET during reset).
> > > > > > >>
> > > > > > >> Ken
> > > > > > >>
> > > > > > >> >hello,
> > > > > > >> >no luck so far, I've replaced the 2N4391 fet, but
still no
> > > > > > >voltage
> > > > > > >> >on pin 2 of the ca3140. I've also measured with a scope
> > to see
> > > > > > >what
> > > > > > >> >is exactly the output on pin 6 of the ca3140, and it
shows
> > > only
> > > > > a
> > > > > > >dc
> > > > > > >> >voltage ( 0.86 V )
> > > > > > >> >
> > > > > > >> >any more clues ?
> > > > > > >> >many thanks in advance !
> > > > > > >> >steven
> > > > > > >> >
> > > > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz"
> > <theevaporizer@>
> > > > > wrote:
> > > > > > >> >>
> > > > > > >> >> hey,
> > > > > > >> >>
> > > > > > >> >> I used a 2n4391, I have no clue how I can check if it
> > > still is
> > > > > > >> >> working properly, so I'll try to replace this
> > compontent to
> > > > > see
> > > > > > >if
> > > > > > >> >it
> > > > > > >> >> makes a difference.
> > > > > > >> >>
> > > > > > >> >> thanks,
> > > > > > >> >> steven
> > > > > > >> >>
> > > > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang"
> > <jumpswine@>
> > > > > > >wrote:
> > > > > > >> >> >
> > > > > > >> >> > Hi
> > > > > > >> >> > look at the FET, what kind are you using? right way
> > around
> > > > > etc
> > > > > > >> >> > some FETS wont work in these ccts.
> > > > > > >> >> > Andrew
> > > > > > >> >> >
> > > > > > >> >> >
> > > > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"
> > <theevaporizer@>
> > > > > > >> >wrote:
> > > > > > >> >> > >
> > > > > > >> >> > > unfortunately my bintic filter is still not
> > working...
> > > > > > >> >> > > I've replaced the tl072, ca3140 and the lm394, but
> > still
> > > > > > >the
> > > > > > >> >> > > oscillator part is not working as expected.
> > > > > > >> >> > > I've noticed that depending on the setting of the
> > > > > frequency
> > > > > > >> >> coarse
> > > > > > >> >> > > pot, I have different readings on the circuit.
> > > > > > >> >> > > I've added here a link to a part of the circuit
> > diagram
> > > > > > >where
> > > > > > >> >> I've
> > > > > > >> >> > > indicated some measurements done in both
minimum and
> > > > > > >maximum
> > > > > > >> >> > > position of the frequency coarse potmeter. I hope
> > > somebody
> > > > > > >can
> > > > > > >> >> give
> > > > > > >> >> > > me clue where more or less the problem should be
> > with
> > > this
> > > > > > >> >data.
> > > > > > >> >> > > Thanks a lot in advance, you can find the drawing
> > here :
> > > > > > >> >> > >
> > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > > > > >> >> > >
> > > > > > >> >> > > steven
> > > > > > >> >> > >
> > > > > > >> >> > >
> > > > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl
> > <rfahl@>
> > > > > wrote:
> > > > > > >> >> > > >
> > > > > > >> >> > > > one thing to keep in mind is that CA3140s are
> > super
> > > > > > >delicate
> > > > > > >> >> ICs.
> > > > > > >> >> > > > They are very sensitive to static, but it
wouldn't
> > > > > > >surprise
> > > > > > >> >me
> > > > > > >> >> if
> > > > > > >> >> > > > hooking up power in reverse was too much for
it to
> > > > > handle.
> > > > > > >> >> > > >
> > > > > > >> >> > > > Romeo
> > > > > > >> >> > > >
> > > > > > >> >> > > >
> > > > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > > > >> >> > > >
> > > > > > >> >> > > > > No chips are hot ( and nothing smells burned )
> > > > > > >> >> > > > > The TL072 seems to working fine, output 7
> > follows the
> > > > > > >> >> frequency
> > > > > > >> >> > > > > settings, but on the CA3140 I always measure
> > 0.56
> > > V on
> > > > > > >pin
> > > > > > >> >2
> > > > > > >> >> and
> > > > > > >> >> > > 1.1
> > > > > > >> >> > > > > V on pin 6 regardless of the frequency setting.
> > Would
> > > > > > >this
> > > > > > >> >> > > indicate
> > > > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > > > >> >> > > > > thanks !
> > > > > > >> >> > > > > steven
> > > > > > >> >> > > > >
> > > > > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@
wrote:
> > > > > > >> >> > > > > >
> > > > > > >> >> > > > > > Test #1 - feel if any chip is getting hot. If
> > > it is,
> > > > > > >> >> replace
> > > > > > >> >> > > it.
> > > > > > >> >> > > > > >
> > > > > > >> >> > > > > > Ken
> > > > > > >> >> > > > > >
> > > > > > >> >> > > > > > >when i wanted to test my bin-n-tic, i
> > incidently
> > > > > > >> >switched
> > > > > > >> >> +
> > > > > > >> >> > > and -
> > > > > > >> >> > > > > > >power supply. after i fixed the problem, I
> > have no
> > > > > > >sound
> > > > > > >> >> > > > > whatsoever.
> > > > > > >> >> > > > > > >I measured 1.1 volt between pin6 of the
> > ca3140.
> > > > > > >> >> > > > > > >Is there any part(s) that is the most likely
> > to be
> > > > > > >> >> damaged ?
> > > > > > >> >> > > > > > >thx,
> > > > > > >> >> > > > > > >steven
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com, "kopernig"
> > > > > > >> ><6079smith@>
> > > > > > >> >> > > wrote:
> > > > > > >> >> > > > > > >>
> > > > > > >> >> > > > > > >> yes, i noticed the diode and put in a
> > jumper...
> > > > > > >but
> > > > > > >> >> still no
> > > > > > >> >> > > > > joy. i
> > > > > > >> >> > > > > > >> don't have a scope (yet) but the voltage
> > on pin
> > > > > > >six
> > > > > > >> >of
> > > > > > >> >> the
> > > > > > >> >> > > > > ca3140
> > > > > > >> >> > > > > > >is
> > > > > > >> >> > > > > > >> just under 1 volt. with an audio probe i
> > can
> > > > > > >(barely)
> > > > > > >> >> hear
> > > > > > >> >> > > a cv
> > > > > > >> >> > > > > > >click.
> > > > > > >> >> > > > > > >> so the vco is not oscillating. i can't
> > > figure out
> > > > > > >why
> > > > > > >> >> the
> > > > > > >> >> > > 2n2
> > > > > > >> >> > > > > > >> capacitor seems to be shorted...
there's no
> > > > > > >> >resistance
> > > > > > >> >> > > between
> > > > > > >> >> > > > > the
> > > > > > >> >> > > > > > >> source and drain of the fet. nothing is
> > > > > physically
> > > > > > >> >> shorted.
> > > > > > >> >> > > a
> > > > > > >> >> > > > > dead
> > > > > > >> >> > > > > > >> fet? any ideas?
> > > > > > >> >> > > > > > >> andrew.
> > > > > > >> >> > > > > > >>
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > > > >> >http://www.cgs.synth.net/
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >Yahoo! Groups Links
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > > >
> > > > > > >> >> > > > > >
> > > > > > >> >> > > > >
> > > > > > >__________________________________________________________
> > > > > > >> >> > > > > __
> > > > > > >> >> > > > > > Ken Stone sasami@
> > > > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > >> >> > > > > >
> > > > > > >> >> > > > >
> > > > > > >> >> > > > >
> > > > > > >> >> > > > >
> > > > > > >> >> > > >
> > > > > > >> >> > > >
> > > > > > >> >> > > >
> > > > > > >> >> > > > [Non-text portions of this message have been
> > removed]
> > > > > > >> >> > > >
> > > > > > >> >> > >
> > > > > > >> >> >
> > > > > > >> >>
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >The CGS Modular Synth home page:
http://www.cgs.synth.net/
> > > > > > >> >
> > > > > > >> >Yahoo! Groups Links
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >>
> > > > > > >__________________________________________________________
> > > > > > >__
> > > > > > >> Ken Stone sasami@
> > > > > > >> Modular Synth PCBs for sale
> > > > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > > > >> Australian Miniature Horses & Ponies
> > > > > > ><http://www.blaze.net.au/~sasami/>
> > > > > > >>
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > > > > >
> > > > > > >Yahoo! Groups Links
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > __________________________________________________________
> > > > > > Ken Stone sasami@
> > > > > > Modular Synth PCBs for sale
> > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > Australian Miniature Horses & Ponies
> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>

On Oct 18, 2008, at 1:02 AM, andrewlistmayer wrote:

> The filter sounds wild and wacky! Like a cross between hard sync and
> phasing, but it doesn't do much until the bandwidth is turned up
> pretty high, so I think it is supposed to be clocked slower. I turned
> the zero trimmer all the way down and that just increases the dead
> area at the beginning of the knob turn, before the frequency starts
> getting higher. I also tried applying negative CV; no dice. It doesn't
> want to go any slower :S
>
> --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
> >
> > That is strange.
> > How does the filter section sound?
> >
> > Scott Deyo
> > The Bridechamber
> > contact@...
> > http://www.bridechamber.com
> > Jealous Edison Record Kompany
> > http://www.jealousedison.com
> >
> >
> > On Oct 16, 2008, at 2:06 AM, andrewlistmayer wrote:
> >
> > > Doh! I just had to re-install that pesky resistor to get the
> filter
> > > clocking, but the minimum pitch of the oscillator is still very
> high,
> > > even after turning the zero trimmer all the way down.
> > >
> > > --- In cgs_synth@yahoogroups.com, "andrewlistmayer"
> > > <andrewlistmayer@> wrote:
> > > >
> > > > Ahh, thanks. Now it's oscillating alright, but really high
> pitched
> > > and
> > > > not affecting the filter section. I guess this means I have a
> > > > 4024-based problem. I'll look into it and collect some more
> data in
> > > > case I still need help.
> > > >
> > > > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > > > >
> > > > > Dang! I forgot about a little boo-boo on the PCB. Link +15V
> to pin
> > > 1 of
> > > > > the LM311 and you should be good to go.
> > > > > It's not connected to anything right now... sorry!
> > > > >
> > > > > Cheers,
> > > > > Scott Deyo
> > > > > The Bridechamber
> > > > > contact@
> > > > > http://www.bridechamber.com
> > > > > Jealous Edison Record Kompany
> > > > > http://www.jealousedison.com
> > > > >
> > > > >
> > > > > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> > > > >
> > > > > > I just read through this old thread because I have a similar
> > > problem
> > > > > > with my Bi-n-Tic. I can get a filter sweep out of the last
> 20%
> > > or so
> > > > > > of the bandwidth knob, but the tuning knobs do nothing. This
> > > leads me
> > > > > > to believe that the center frequency is stuck somewhere
> below
> > > the
> > > > > > audio range. So, I check the oscillator section. I also
> have a
> > > slight
> > > > > > amount of DC on pin6 of CA3140, so it isn't oscillating. I
> also
> > > have
> > > > > > voltage on pin 2, which is supposed to be at 0. Then, I
> start
> > > at the
> > > > > > beginning and try to figure out what is wrong. I can find no
> > > > faults in
> > > > > > the CV summing section, yet I only get between -.8 and
> barely
> > > > above 0v
> > > > > > depending on the coarse tune pot. Is this correct? Also, I
> am
> > > not
> > > > > > getting +15 on pin 1 of the LM311 like it shows on the
> > > schematic. The
> > > > > > datasheet tells me this is a ground pin, so I'm not sure how
> > > > important
> > > > > > this is. I'm using a PN4391 fet and I matched the G, S and
> D on
> > > the
> > > > > > PCB with the pinout on the fairchild datasheet. One last
> thing
> > > to
> > > > note
> > > > > > is that I'm using the bridechamber PCB. I didn't know what
> to do
> > > > about
> > > > > > the 100k resistor marked with a star, so I installed, then
> > > removed it
> > > > > > afterwards.
> > > > > >
> > > > > > I'm stumped at this point, so any hints would be greatly
> > > appreciated.
> > > > > >
> > > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > >
> > > > > > > Check your capacitor too. Make sure it is the right size.
> > > Make sure
> > > > > > it is
> > > > > > > actually soldered in - no bad joints, or not between the
> wrong
> > > > > > holes. there
> > > > > > > is a spare hole there to allow for different sizes. If you
> > > have
> > > > the
> > > > > > cap
> > > > > > > between two the holes that are joined by the trackwork, it
> > > isn't
> > > > > > going to work.
> > > > > > >
> > > > > > > Also note that the pin-outs of different FETs varies. If I
> > > use the
> > > > > > 2n4091, I
> > > > > > > need to install it "backwards" to the marking on the PCB.
> > > > > > >
> > > > > > > Ken
> > > > > > >
> > > > > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets
> it's
> > > > > > > >powersupply, it should create some AC voltage on pin 6 ?
> > > > > > > >I have only a DC voltage that varies between 0 & 0.86 VDC
> > > > > > (depending
> > > > > > > >on the position of the coarse frequency pot )
> > > > > > > >
> > > > > > > >thanks again for your help !
> > > > > > > >steven
> > > > > > > >
> > > > > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > > >>
> > > > > > > >> You should never see any voltage on pin 2 of the 3140
> - it
> > > is a
> > > > > > > >summing
> > > > > > > >> node. It is a basic op-amp feedback loop. Yhe opamp
> > > devotes its
> > > > > > > >entire time
> > > > > > > >> truing to keep pins 2 and 3 at exactly the same
> voltage. As
> > > > pin 3
> > > > > > > >is 0v, pin
> > > > > > > >> 2 will be 0v. The current through the point will of
> course
> > > vary
> > > > > > as
> > > > > > > >the
> > > > > > > >> output of the op-amp fights the current drawn through
> the
> > > LM394
> > > > > > > >(through the
> > > > > > > >> integrating capacitor and through the FET during
> reset).
> > > > > > > >>
> > > > > > > >> Ken
> > > > > > > >>
> > > > > > > >> >hello,
> > > > > > > >> >no luck so far, I've replaced the 2N4391 fet, but
> still no
> > > > > > > >voltage
> > > > > > > >> >on pin 2 of the ca3140. I've also measured with a
> scope
> > > to see
> > > > > > > >what
> > > > > > > >> >is exactly the output on pin 6 of the ca3140, and it
> shows
> > > > only
> > > > > > a
> > > > > > > >dc
> > > > > > > >> >voltage ( 0.86 V )
> > > > > > > >> >
> > > > > > > >> >any more clues ?
> > > > > > > >> >many thanks in advance !
> > > > > > > >> >steven
> > > > > > > >> >
> > > > > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz"
> > > <theevaporizer@>
> > > > > > wrote:
> > > > > > > >> >>
> > > > > > > >> >> hey,
> > > > > > > >> >>
> > > > > > > >> >> I used a 2n4391, I have no clue how I can check if
> it
> > > > still is
> > > > > > > >> >> working properly, so I'll try to replace this
> > > compontent to
> > > > > > see
> > > > > > > >if
> > > > > > > >> >it
> > > > > > > >> >> makes a difference.
> > > > > > > >> >>
> > > > > > > >> >> thanks,
> > > > > > > >> >> steven
> > > > > > > >> >>
> > > > > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang"
> > > <jumpswine@>
> > > > > > > >wrote:
> > > > > > > >> >> >
> > > > > > > >> >> > Hi
> > > > > > > >> >> > look at the FET, what kind are you using? right
> way
> > > around
> > > > > > etc
> > > > > > > >> >> > some FETS wont work in these ccts.
> > > > > > > >> >> > Andrew
> > > > > > > >> >> >
> > > > > > > >> >> >
> > > > > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"
> > > <theevaporizer@>
> > > > > > > >> >wrote:
> > > > > > > >> >> > >
> > > > > > > >> >> > > unfortunately my bintic filter is still not
> > > working...
> > > > > > > >> >> > > I've replaced the tl072, ca3140 and the lm394,
> but
> > > still
> > > > > > > >the
> > > > > > > >> >> > > oscillator part is not working as expected.
> > > > > > > >> >> > > I've noticed that depending on the setting of
> the
> > > > > > frequency
> > > > > > > >> >> coarse
> > > > > > > >> >> > > pot, I have different readings on the circuit.
> > > > > > > >> >> > > I've added here a link to a part of the circuit
> > > diagram
> > > > > > > >where
> > > > > > > >> >> I've
> > > > > > > >> >> > > indicated some measurements done in both
> minimum and
> > > > > > > >maximum
> > > > > > > >> >> > > position of the frequency coarse potmeter. I
> hope
> > > > somebody
> > > > > > > >can
> > > > > > > >> >> give
> > > > > > > >> >> > > me clue where more or less the problem should be
> > > with
> > > > this
> > > > > > > >> >data.
> > > > > > > >> >> > > Thanks a lot in advance, you can find the
> drawing
> > > here :
> > > > > > > >> >> > >
> > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > > > > > >> >> > >
> > > > > > > >> >> > > steven
> > > > > > > >> >> > >
> > > > > > > >> >> > >
> > > > > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl
> > > <rfahl@>
> > > > > > wrote:
> > > > > > > >> >> > > >
> > > > > > > >> >> > > > one thing to keep in mind is that CA3140s are
> > > super
> > > > > > > >delicate
> > > > > > > >> >> ICs.
> > > > > > > >> >> > > > They are very sensitive to static, but it
> wouldn't
> > > > > > > >surprise
> > > > > > > >> >me
> > > > > > > >> >> if
> > > > > > > >> >> > > > hooking up power in reverse was too much for
> it to
> > > > > > handle.
> > > > > > > >> >> > > >
> > > > > > > >> >> > > > Romeo
> > > > > > > >> >> > > >
> > > > > > > >> >> > > >
> > > > > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > > > > >> >> > > >
> > > > > > > >> >> > > > > No chips are hot ( and nothing smells
> burned )
> > > > > > > >> >> > > > > The TL072 seems to working fine, output 7
> > > follows the
> > > > > > > >> >> frequency
> > > > > > > >> >> > > > > settings, but on the CA3140 I always measure
> > > 0.56
> > > > V on
> > > > > > > >pin
> > > > > > > >> >2
> > > > > > > >> >> and
> > > > > > > >> >> > > 1.1
> > > > > > > >> >> > > > > V on pin 6 regardless of the frequency
> setting.
> > > Would
> > > > > > > >this
> > > > > > > >> >> > > indicate
> > > > > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > > > > >> >> > > > > thanks !
> > > > > > > >> >> > > > > steven
> > > > > > > >> >> > > > >
> > > > > > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@
> wrote:
> > > > > > > >> >> > > > > >
> > > > > > > >> >> > > > > > Test #1 - feel if any chip is getting
> hot. If
> > > > it is,
> > > > > > > >> >> replace
> > > > > > > >> >> > > it.
> > > > > > > >> >> > > > > >
> > > > > > > >> >> > > > > > Ken
> > > > > > > >> >> > > > > >
> > > > > > > >> >> > > > > > >when i wanted to test my bin-n-tic, i
> > > incidently
> > > > > > > >> >switched
> > > > > > > >> >> +
> > > > > > > >> >> > > and -
> > > > > > > >> >> > > > > > >power supply. after i fixed the problem,
> I
> > > have no
> > > > > > > >sound
> > > > > > > >> >> > > > > whatsoever.
> > > > > > > >> >> > > > > > >I measured 1.1 volt between pin6 of the
> > > ca3140.
> > > > > > > >> >> > > > > > >Is there any part(s) that is the most
> likely
> > > to be
> > > > > > > >> >> damaged ?
> > > > > > > >> >> > > > > > >thx,
> > > > > > > >> >> > > > > > >steven
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com,
> "kopernig"
> > > > > > > >> ><6079smith@>
> > > > > > > >> >> > > wrote:
> > > > > > > >> >> > > > > > >>
> > > > > > > >> >> > > > > > >> yes, i noticed the diode and put in a
> > > jumper...
> > > > > > > >but
> > > > > > > >> >> still no
> > > > > > > >> >> > > > > joy. i
> > > > > > > >> >> > > > > > >> don't have a scope (yet) but the
> voltage
> > > on pin
> > > > > > > >six
> > > > > > > >> >of
> > > > > > > >> >> the
> > > > > > > >> >> > > > > ca3140
> > > > > > > >> >> > > > > > >is
> > > > > > > >> >> > > > > > >> just under 1 volt. with an audio probe
> i
> > > can
> > > > > > > >(barely)
> > > > > > > >> >> hear
> > > > > > > >> >> > > a cv
> > > > > > > >> >> > > > > > >click.
> > > > > > > >> >> > > > > > >> so the vco is not oscillating. i can't
> > > > figure out
> > > > > > > >why
> > > > > > > >> >> the
> > > > > > > >> >> > > 2n2
> > > > > > > >> >> > > > > > >> capacitor seems to be shorted...
> there's no
> > > > > > > >> >resistance
> > > > > > > >> >> > > between
> > > > > > > >> >> > > > > the
> > > > > > > >> >> > > > > > >> source and drain of the fet. nothing is
> > > > > > physically
> > > > > > > >> >> shorted.
> > > > > > > >> >> > > a
> > > > > > > >> >> > > > > dead
> > > > > > > >> >> > > > > > >> fet? any ideas?
> > > > > > > >> >> > > > > > >> andrew.
> > > > > > > >> >> > > > > > >>
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > > > > >> >http://www.cgs.synth.net/
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >Yahoo! Groups Links
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > > >
> > > > > > > >> >> > > > > >
> > > > > > > >> >> > > > >
> > > > > > >
> >__________________________________________________________
> > > > > > > >> >> > > > > __
> > > > > > > >> >> > > > > > Ken Stone sasami@
> > > > > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > > >> >> > > > > >
> > > > > > > >> >> > > > >
> > > > > > > >> >> > > > >
> > > > > > > >> >> > > > >
> > > > > > > >> >> > > >
> > > > > > > >> >> > > >
> > > > > > > >> >> > > >
> > > > > > > >> >> > > > [Non-text portions of this message have been
> > > removed]
> > > > > > > >> >> > > >
> > > > > > > >> >> > >
> > > > > > > >> >> >
> > > > > > > >> >>
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >The CGS Modular Synth home page:
> http://www.cgs.synth.net/
> > > > > > > >> >
> > > > > > > >> >Yahoo! Groups Links
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >>
> > > > > > >
> >__________________________________________________________
> > > > > > > >__
> > > > > > > >> Ken Stone sasami@
> > > > > > > >> Modular Synth PCBs for sale
> > > > > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > > > > >> Australian Miniature Horses & Ponies
> > > > > > > ><http://www.blaze.net.au/~sasami/>
> > > > > > > >>
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >The CGS Modular Synth home page:
> http://www.cgs.synth.net/
> > > > > > > >
> > > > > > > >Yahoo! Groups Links
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > __________________________________________________________
> > > > > > > Ken Stone sasami@
> > > > > > > Modular Synth PCBs for sale
> > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > > Australian Miniature Horses & Ponies
> > > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > > [Non-text portions of this message have been removed]
> > > > >
> > > >
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>

[Non-text portions of this message have been removed]

--- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
>
> So the frequency of the oscillator outputs is high, right?
> I'm not sure what would cause that.
> Any wiring mistakes? I usually try to make at least one on each Bintic
> : )
>
> Scott Deyo
> The Bridechamber
> contact@...
> http://www.bridechamber.com
> Jealous Edison Record Kompany
> http://www.jealousedison.com
>
>
> On Oct 18, 2008, at 1:02 AM, andrewlistmayer wrote:
>
> > The filter sounds wild and wacky! Like a cross between hard sync and
> > phasing, but it doesn't do much until the bandwidth is turned up
> > pretty high, so I think it is supposed to be clocked slower. I turned
> > the zero trimmer all the way down and that just increases the dead
> > area at the beginning of the knob turn, before the frequency starts
> > getting higher. I also tried applying negative CV; no dice. It
doesn't
> > want to go any slower :S
> >
> > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > >
> > > That is strange.
> > > How does the filter section sound?
> > >
> > > Scott Deyo
> > > The Bridechamber
> > > contact@
> > > http://www.bridechamber.com
> > > Jealous Edison Record Kompany
> > > http://www.jealousedison.com
> > >
> > >
> > > On Oct 16, 2008, at 2:06 AM, andrewlistmayer wrote:
> > >
> > > > Doh! I just had to re-install that pesky resistor to get the
> > filter
> > > > clocking, but the minimum pitch of the oscillator is still very
> > high,
> > > > even after turning the zero trimmer all the way down.
> > > >
> > > > --- In cgs_synth@yahoogroups.com, "andrewlistmayer"
> > > > <andrewlistmayer@> wrote:
> > > > >
> > > > > Ahh, thanks. Now it's oscillating alright, but really high
> > pitched
> > > > and
> > > > > not affecting the filter section. I guess this means I have a
> > > > > 4024-based problem. I'll look into it and collect some more
> > data in
> > > > > case I still need help.
> > > > >
> > > > > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > > > > >
> > > > > > Dang! I forgot about a little boo-boo on the PCB. Link +15V
> > to pin
> > > > 1 of
> > > > > > the LM311 and you should be good to go.
> > > > > > It's not connected to anything right now... sorry!
> > > > > >
> > > > > > Cheers,
> > > > > > Scott Deyo
> > > > > > The Bridechamber
> > > > > > contact@
> > > > > > http://www.bridechamber.com
> > > > > > Jealous Edison Record Kompany
> > > > > > http://www.jealousedison.com
> > > > > >
> > > > > >
> > > > > > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> > > > > >
> > > > > > > I just read through this old thread because I have a
similar
> > > > problem
> > > > > > > with my Bi-n-Tic. I can get a filter sweep out of the last
> > 20%
> > > > or so
> > > > > > > of the bandwidth knob, but the tuning knobs do nothing.
This
> > > > leads me
> > > > > > > to believe that the center frequency is stuck somewhere
> > below
> > > > the
> > > > > > > audio range. So, I check the oscillator section. I also
> > have a
> > > > slight
> > > > > > > amount of DC on pin6 of CA3140, so it isn't oscillating. I
> > also
> > > > have
> > > > > > > voltage on pin 2, which is supposed to be at 0. Then, I
> > start
> > > > at the
> > > > > > > beginning and try to figure out what is wrong. I can
find no
> > > > > faults in
> > > > > > > the CV summing section, yet I only get between -.8 and
> > barely
> > > > > above 0v
> > > > > > > depending on the coarse tune pot. Is this correct? Also, I
> > am
> > > > not
> > > > > > > getting +15 on pin 1 of the LM311 like it shows on the
> > > > schematic. The
> > > > > > > datasheet tells me this is a ground pin, so I'm not
sure how
> > > > > important
> > > > > > > this is. I'm using a PN4391 fet and I matched the G, S and
> > D on
> > > > the
> > > > > > > PCB with the pinout on the fairchild datasheet. One last
> > thing
> > > > to
> > > > > note
> > > > > > > is that I'm using the bridechamber PCB. I didn't know what
> > to do
> > > > > about
> > > > > > > the 100k resistor marked with a star, so I installed, then
> > > > removed it
> > > > > > > afterwards.
> > > > > > >
> > > > > > > I'm stumped at this point, so any hints would be greatly
> > > > appreciated.
> > > > > > >
> > > > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > > >
> > > > > > > > Check your capacitor too. Make sure it is the right size.
> > > > Make sure
> > > > > > > it is
> > > > > > > > actually soldered in - no bad joints, or not between the
> > wrong
> > > > > > > holes. there
> > > > > > > > is a spare hole there to allow for different sizes.
If you
> > > > have
> > > > > the
> > > > > > > cap
> > > > > > > > between two the holes that are joined by the
trackwork, it
> > > > isn't
> > > > > > > going to work.
> > > > > > > >
> > > > > > > > Also note that the pin-outs of different FETs varies.
If I
> > > > use the
> > > > > > > 2n4091, I
> > > > > > > > need to install it "backwards" to the marking on the PCB.
> > > > > > > >
> > > > > > > > Ken
> > > > > > > >
> > > > > > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140 gets
> > it's
> > > > > > > > >powersupply, it should create some AC voltage on pin 6 ?
> > > > > > > > >I have only a DC voltage that varies between 0 &
0.86 VDC
> > > > > > > (depending
> > > > > > > > >on the position of the coarse frequency pot )
> > > > > > > > >
> > > > > > > > >thanks again for your help !
> > > > > > > > >steven
> > > > > > > > >
> > > > > > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > > > >>
> > > > > > > > >> You should never see any voltage on pin 2 of the 3140
> > - it
> > > > is a
> > > > > > > > >summing
> > > > > > > > >> node. It is a basic op-amp feedback loop. Yhe opamp
> > > > devotes its
> > > > > > > > >entire time
> > > > > > > > >> truing to keep pins 2 and 3 at exactly the same
> > voltage. As
> > > > > pin 3
> > > > > > > > >is 0v, pin
> > > > > > > > >> 2 will be 0v. The current through the point will of
> > course
> > > > vary
> > > > > > > as
> > > > > > > > >the
> > > > > > > > >> output of the op-amp fights the current drawn through
> > the
> > > > LM394
> > > > > > > > >(through the
> > > > > > > > >> integrating capacitor and through the FET during
> > reset).
> > > > > > > > >>
> > > > > > > > >> Ken
> > > > > > > > >>
> > > > > > > > >> >hello,
> > > > > > > > >> >no luck so far, I've replaced the 2N4391 fet, but
> > still no
> > > > > > > > >voltage
> > > > > > > > >> >on pin 2 of the ca3140. I've also measured with a
> > scope
> > > > to see
> > > > > > > > >what
> > > > > > > > >> >is exactly the output on pin 6 of the ca3140, and it
> > shows
> > > > > only
> > > > > > > a
> > > > > > > > >dc
> > > > > > > > >> >voltage ( 0.86 V )
> > > > > > > > >> >
> > > > > > > > >> >any more clues ?
> > > > > > > > >> >many thanks in advance !
> > > > > > > > >> >steven
> > > > > > > > >> >
> > > > > > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz"
> > > > <theevaporizer@>
> > > > > > > wrote:
> > > > > > > > >> >>
> > > > > > > > >> >> hey,
> > > > > > > > >> >>
> > > > > > > > >> >> I used a 2n4391, I have no clue how I can check if
> > it
> > > > > still is
> > > > > > > > >> >> working properly, so I'll try to replace this
> > > > compontent to
> > > > > > > see
> > > > > > > > >if
> > > > > > > > >> >it
> > > > > > > > >> >> makes a difference.
> > > > > > > > >> >>
> > > > > > > > >> >> thanks,
> > > > > > > > >> >> steven
> > > > > > > > >> >>
> > > > > > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang"
> > > > <jumpswine@>
> > > > > > > > >wrote:
> > > > > > > > >> >> >
> > > > > > > > >> >> > Hi
> > > > > > > > >> >> > look at the FET, what kind are you using? right
> > way
> > > > around
> > > > > > > etc
> > > > > > > > >> >> > some FETS wont work in these ccts.
> > > > > > > > >> >> > Andrew
> > > > > > > > >> >> >
> > > > > > > > >> >> >
> > > > > > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"
> > > > <theevaporizer@>
> > > > > > > > >> >wrote:
> > > > > > > > >> >> > >
> > > > > > > > >> >> > > unfortunately my bintic filter is still not
> > > > working...
> > > > > > > > >> >> > > I've replaced the tl072, ca3140 and the lm394,
> > but
> > > > still
> > > > > > > > >the
> > > > > > > > >> >> > > oscillator part is not working as expected.
> > > > > > > > >> >> > > I've noticed that depending on the setting of
> > the
> > > > > > > frequency
> > > > > > > > >> >> coarse
> > > > > > > > >> >> > > pot, I have different readings on the circuit.
> > > > > > > > >> >> > > I've added here a link to a part of the circuit
> > > > diagram
> > > > > > > > >where
> > > > > > > > >> >> I've
> > > > > > > > >> >> > > indicated some measurements done in both
> > minimum and
> > > > > > > > >maximum
> > > > > > > > >> >> > > position of the frequency coarse potmeter. I
> > hope
> > > > > somebody
> > > > > > > > >can
> > > > > > > > >> >> give
> > > > > > > > >> >> > > me clue where more or less the problem
should be
> > > > with
> > > > > this
> > > > > > > > >> >data.
> > > > > > > > >> >> > > Thanks a lot in advance, you can find the
> > drawing
> > > > here :
> > > > > > > > >> >> > >
> > > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > > > > > > >> >> > >
> > > > > > > > >> >> > > steven
> > > > > > > > >> >> > >
> > > > > > > > >> >> > >
> > > > > > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl
> > > > <rfahl@>
> > > > > > > wrote:
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > > one thing to keep in mind is that CA3140s are
> > > > super
> > > > > > > > >delicate
> > > > > > > > >> >> ICs.
> > > > > > > > >> >> > > > They are very sensitive to static, but it
> > wouldn't
> > > > > > > > >surprise
> > > > > > > > >> >me
> > > > > > > > >> >> if
> > > > > > > > >> >> > > > hooking up power in reverse was too much for
> > it to
> > > > > > > handle.
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > > Romeo
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > > > No chips are hot ( and nothing smells
> > burned )
> > > > > > > > >> >> > > > > The TL072 seems to working fine, output 7
> > > > follows the
> > > > > > > > >> >> frequency
> > > > > > > > >> >> > > > > settings, but on the CA3140 I always
measure
> > > > 0.56
> > > > > V on
> > > > > > > > >pin
> > > > > > > > >> >2
> > > > > > > > >> >> and
> > > > > > > > >> >> > > 1.1
> > > > > > > > >> >> > > > > V on pin 6 regardless of the frequency
> > setting.
> > > > Would
> > > > > > > > >this
> > > > > > > > >> >> > > indicate
> > > > > > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > > > > > >> >> > > > > thanks !
> > > > > > > > >> >> > > > > steven
> > > > > > > > >> >> > > > >
> > > > > > > > >> >> > > > > --- In cgs_synth@yahoogroups.com, sasami@
> > wrote:
> > > > > > > > >> >> > > > > >
> > > > > > > > >> >> > > > > > Test #1 - feel if any chip is getting
> > hot. If
> > > > > it is,
> > > > > > > > >> >> replace
> > > > > > > > >> >> > > it.
> > > > > > > > >> >> > > > > >
> > > > > > > > >> >> > > > > > Ken
> > > > > > > > >> >> > > > > >
> > > > > > > > >> >> > > > > > >when i wanted to test my bin-n-tic, i
> > > > incidently
> > > > > > > > >> >switched
> > > > > > > > >> >> +
> > > > > > > > >> >> > > and -
> > > > > > > > >> >> > > > > > >power supply. after i fixed the
problem,
> > I
> > > > have no
> > > > > > > > >sound
> > > > > > > > >> >> > > > > whatsoever.
> > > > > > > > >> >> > > > > > >I measured 1.1 volt between pin6 of the
> > > > ca3140.
> > > > > > > > >> >> > > > > > >Is there any part(s) that is the most
> > likely
> > > > to be
> > > > > > > > >> >> damaged ?
> > > > > > > > >> >> > > > > > >thx,
> > > > > > > > >> >> > > > > > >steven
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com,
> > "kopernig"
> > > > > > > > >> ><6079smith@>
> > > > > > > > >> >> > > wrote:
> > > > > > > > >> >> > > > > > >>
> > > > > > > > >> >> > > > > > >> yes, i noticed the diode and put in a
> > > > jumper...
> > > > > > > > >but
> > > > > > > > >> >> still no
> > > > > > > > >> >> > > > > joy. i
> > > > > > > > >> >> > > > > > >> don't have a scope (yet) but the
> > voltage
> > > > on pin
> > > > > > > > >six
> > > > > > > > >> >of
> > > > > > > > >> >> the
> > > > > > > > >> >> > > > > ca3140
> > > > > > > > >> >> > > > > > >is
> > > > > > > > >> >> > > > > > >> just under 1 volt. with an audio
probe
> > i
> > > > can
> > > > > > > > >(barely)
> > > > > > > > >> >> hear
> > > > > > > > >> >> > > a cv
> > > > > > > > >> >> > > > > > >click.
> > > > > > > > >> >> > > > > > >> so the vco is not oscillating. i can't
> > > > > figure out
> > > > > > > > >why
> > > > > > > > >> >> the
> > > > > > > > >> >> > > 2n2
> > > > > > > > >> >> > > > > > >> capacitor seems to be shorted...
> > there's no
> > > > > > > > >> >resistance
> > > > > > > > >> >> > > between
> > > > > > > > >> >> > > > > the
> > > > > > > > >> >> > > > > > >> source and drain of the fet.
nothing is
> > > > > > > physically
> > > > > > > > >> >> shorted.
> > > > > > > > >> >> > > a
> > > > > > > > >> >> > > > > dead
> > > > > > > > >> >> > > > > > >> fet? any ideas?
> > > > > > > > >> >> > > > > > >> andrew.
> > > > > > > > >> >> > > > > > >>
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > > > > > >> >http://www.cgs.synth.net/
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >Yahoo! Groups Links
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > > >
> > > > > > > > >> >> > > > > >
> > > > > > > > >> >> > > > >
> > > > > > > >
> > >__________________________________________________________
> > > > > > > > >> >> > > > > __
> > > > > > > > >> >> > > > > > Ken Stone sasami@
> > > > > > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > > > >> >> > > > > >
> > > > > > > > >> >> > > > >
> > > > > > > > >> >> > > > >
> > > > > > > > >> >> > > > >
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > > > [Non-text portions of this message have been
> > > > removed]
> > > > > > > > >> >> > > >
> > > > > > > > >> >> > >
> > > > > > > > >> >> >
> > > > > > > > >> >>
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >The CGS Modular Synth home page:
> > http://www.cgs.synth.net/
> > > > > > > > >> >
> > > > > > > > >> >Yahoo! Groups Links
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >>
> > > > > > > >
> > >__________________________________________________________
> > > > > > > > >__
> > > > > > > > >> Ken Stone sasami@
> > > > > > > > >> Modular Synth PCBs for sale
> > > > > > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > >> Australian Miniature Horses & Ponies
> > > > > > > > ><http://www.blaze.net.au/~sasami/>
> > > > > > > > >>
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >The CGS Modular Synth home page:
> > http://www.cgs.synth.net/
> > > > > > > > >
> > > > > > > > >Yahoo! Groups Links
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
__________________________________________________________
> > > > > > > > Ken Stone sasami@
> > > > > > > > Modular Synth PCBs for sale
> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > Australian Miniature Horses & Ponies
> > > > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > [Non-text portions of this message have been removed]
> > > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>

On Oct 19, 2008, at 4:18 AM, andrewlistmayer wrote:

> Yes, at the low end of the coarse knob, the oscillator is already in
> the mid to high range. It does nothing til about 9 oclock then it gets
> higher, eventually getting so high around 1 oclock that it stops
> clocking the filter. The only wiring mistake I could see affecting
> this would be with the tune knobs, but they both have +/- 15 on either
> end and go to the coarse and fine tune pads on the PCB :S I've already
> checked the CV summing sections for continuity and values(though I
> didn't unsolder any of the resistors before measuring them) and didn't
> find any shorts. I tried adding bigger capacitors in parallel with the
> 2n2, but before I could get as low as what you might call a bass sound
> it stopped clocking the filter >_<
>
> --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
> >
> > So the frequency of the oscillator outputs is high, right?
> > I'm not sure what would cause that.
> > Any wiring mistakes? I usually try to make at least one on each
> Bintic
> > : )
> >
> > Scott Deyo
> > The Bridechamber
> > contact@...
> > http://www.bridechamber.com
> > Jealous Edison Record Kompany
> > http://www.jealousedison.com
> >
> >
> > On Oct 18, 2008, at 1:02 AM, andrewlistmayer wrote:
> >
> > > The filter sounds wild and wacky! Like a cross between hard sync
> and
> > > phasing, but it doesn't do much until the bandwidth is turned up
> > > pretty high, so I think it is supposed to be clocked slower. I
> turned
> > > the zero trimmer all the way down and that just increases the dead
> > > area at the beginning of the knob turn, before the frequency
> starts
> > > getting higher. I also tried applying negative CV; no dice. It
> doesn't
> > > want to go any slower :S
> > >
> > > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > > >
> > > > That is strange.
> > > > How does the filter section sound?
> > > >
> > > > Scott Deyo
> > > > The Bridechamber
> > > > contact@
> > > > http://www.bridechamber.com
> > > > Jealous Edison Record Kompany
> > > > http://www.jealousedison.com
> > > >
> > > >
> > > > On Oct 16, 2008, at 2:06 AM, andrewlistmayer wrote:
> > > >
> > > > > Doh! I just had to re-install that pesky resistor to get the
> > > filter
> > > > > clocking, but the minimum pitch of the oscillator is still
> very
> > > high,
> > > > > even after turning the zero trimmer all the way down.
> > > > >
> > > > > --- In cgs_synth@yahoogroups.com, "andrewlistmayer"
> > > > > <andrewlistmayer@> wrote:
> > > > > >
> > > > > > Ahh, thanks. Now it's oscillating alright, but really high
> > > pitched
> > > > > and
> > > > > > not affecting the filter section. I guess this means I have
> a
> > > > > > 4024-based problem. I'll look into it and collect some more
> > > data in
> > > > > > case I still need help.
> > > > > >
> > > > > > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@>
> wrote:
> > > > > > >
> > > > > > > Dang! I forgot about a little boo-boo on the PCB. Link
> +15V
> > > to pin
> > > > > 1 of
> > > > > > > the LM311 and you should be good to go.
> > > > > > > It's not connected to anything right now... sorry!
> > > > > > >
> > > > > > > Cheers,
> > > > > > > Scott Deyo
> > > > > > > The Bridechamber
> > > > > > > contact@
> > > > > > > http://www.bridechamber.com
> > > > > > > Jealous Edison Record Kompany
> > > > > > > http://www.jealousedison.com
> > > > > > >
> > > > > > >
> > > > > > > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> > > > > > >
> > > > > > > > I just read through this old thread because I have a
> similar
> > > > > problem
> > > > > > > > with my Bi-n-Tic. I can get a filter sweep out of the
> last
> > > 20%
> > > > > or so
> > > > > > > > of the bandwidth knob, but the tuning knobs do nothing.
> This
> > > > > leads me
> > > > > > > > to believe that the center frequency is stuck somewhere
> > > below
> > > > > the
> > > > > > > > audio range. So, I check the oscillator section. I also
> > > have a
> > > > > slight
> > > > > > > > amount of DC on pin6 of CA3140, so it isn't
> oscillating. I
> > > also
> > > > > have
> > > > > > > > voltage on pin 2, which is supposed to be at 0. Then, I
> > > start
> > > > > at the
> > > > > > > > beginning and try to figure out what is wrong. I can
> find no
> > > > > > faults in
> > > > > > > > the CV summing section, yet I only get between -.8 and
> > > barely
> > > > > > above 0v
> > > > > > > > depending on the coarse tune pot. Is this correct?
> Also, I
> > > am
> > > > > not
> > > > > > > > getting +15 on pin 1 of the LM311 like it shows on the
> > > > > schematic. The
> > > > > > > > datasheet tells me this is a ground pin, so I'm not
> sure how
> > > > > > important
> > > > > > > > this is. I'm using a PN4391 fet and I matched the G, S
> and
> > > D on
> > > > > the
> > > > > > > > PCB with the pinout on the fairchild datasheet. One last
> > > thing
> > > > > to
> > > > > > note
> > > > > > > > is that I'm using the bridechamber PCB. I didn't know
> what
> > > to do
> > > > > > about
> > > > > > > > the 100k resistor marked with a star, so I installed,
> then
> > > > > removed it
> > > > > > > > afterwards.
> > > > > > > >
> > > > > > > > I'm stumped at this point, so any hints would be greatly
> > > > > appreciated.
> > > > > > > >
> > > > > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > > > >
> > > > > > > > > Check your capacitor too. Make sure it is the right
> size.
> > > > > Make sure
> > > > > > > > it is
> > > > > > > > > actually soldered in - no bad joints, or not between
> the
> > > wrong
> > > > > > > > holes. there
> > > > > > > > > is a spare hole there to allow for different sizes.
> If you
> > > > > have
> > > > > > the
> > > > > > > > cap
> > > > > > > > > between two the holes that are joined by the
> trackwork, it
> > > > > isn't
> > > > > > > > going to work.
> > > > > > > > >
> > > > > > > > > Also note that the pin-outs of different FETs varies.
> If I
> > > > > use the
> > > > > > > > 2n4091, I
> > > > > > > > > need to install it "backwards" to the marking on the
> PCB.
> > > > > > > > >
> > > > > > > > > Ken
> > > > > > > > >
> > > > > > > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140
> gets
> > > it's
> > > > > > > > > >powersupply, it should create some AC voltage on pin
> 6 ?
> > > > > > > > > >I have only a DC voltage that varies between 0 &
> 0.86 VDC
> > > > > > > > (depending
> > > > > > > > > >on the position of the coarse frequency pot )
> > > > > > > > > >
> > > > > > > > > >thanks again for your help !
> > > > > > > > > >steven
> > > > > > > > > >
> > > > > > > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > > > > >>
> > > > > > > > > >> You should never see any voltage on pin 2 of the
> 3140
> > > - it
> > > > > is a
> > > > > > > > > >summing
> > > > > > > > > >> node. It is a basic op-amp feedback loop. Yhe opamp
> > > > > devotes its
> > > > > > > > > >entire time
> > > > > > > > > >> truing to keep pins 2 and 3 at exactly the same
> > > voltage. As
> > > > > > pin 3
> > > > > > > > > >is 0v, pin
> > > > > > > > > >> 2 will be 0v. The current through the point will of
> > > course
> > > > > vary
> > > > > > > > as
> > > > > > > > > >the
> > > > > > > > > >> output of the op-amp fights the current drawn
> through
> > > the
> > > > > LM394
> > > > > > > > > >(through the
> > > > > > > > > >> integrating capacitor and through the FET during
> > > reset).
> > > > > > > > > >>
> > > > > > > > > >> Ken
> > > > > > > > > >>
> > > > > > > > > >> >hello,
> > > > > > > > > >> >no luck so far, I've replaced the 2N4391 fet, but
> > > still no
> > > > > > > > > >voltage
> > > > > > > > > >> >on pin 2 of the ca3140. I've also measured with a
> > > scope
> > > > > to see
> > > > > > > > > >what
> > > > > > > > > >> >is exactly the output on pin 6 of the ca3140, and
> it
> > > shows
> > > > > > only
> > > > > > > > a
> > > > > > > > > >dc
> > > > > > > > > >> >voltage ( 0.86 V )
> > > > > > > > > >> >
> > > > > > > > > >> >any more clues ?
> > > > > > > > > >> >many thanks in advance !
> > > > > > > > > >> >steven
> > > > > > > > > >> >
> > > > > > > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz"
> > > > > <theevaporizer@>
> > > > > > > > wrote:
> > > > > > > > > >> >>
> > > > > > > > > >> >> hey,
> > > > > > > > > >> >>
> > > > > > > > > >> >> I used a 2n4391, I have no clue how I can check
> if
> > > it
> > > > > > still is
> > > > > > > > > >> >> working properly, so I'll try to replace this
> > > > > compontent to
> > > > > > > > see
> > > > > > > > > >if
> > > > > > > > > >> >it
> > > > > > > > > >> >> makes a difference.
> > > > > > > > > >> >>
> > > > > > > > > >> >> thanks,
> > > > > > > > > >> >> steven
> > > > > > > > > >> >>
> > > > > > > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang"
> > > > > <jumpswine@>
> > > > > > > > > >wrote:
> > > > > > > > > >> >> >
> > > > > > > > > >> >> > Hi
> > > > > > > > > >> >> > look at the FET, what kind are you using?
> right
> > > way
> > > > > around
> > > > > > > > etc
> > > > > > > > > >> >> > some FETS wont work in these ccts.
> > > > > > > > > >> >> > Andrew
> > > > > > > > > >> >> >
> > > > > > > > > >> >> >
> > > > > > > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"
> > > > > <theevaporizer@>
> > > > > > > > > >> >wrote:
> > > > > > > > > >> >> > >
> > > > > > > > > >> >> > > unfortunately my bintic filter is still not
> > > > > working...
> > > > > > > > > >> >> > > I've replaced the tl072, ca3140 and the
> lm394,
> > > but
> > > > > still
> > > > > > > > > >the
> > > > > > > > > >> >> > > oscillator part is not working as expected.
> > > > > > > > > >> >> > > I've noticed that depending on the setting
> of
> > > the
> > > > > > > > frequency
> > > > > > > > > >> >> coarse
> > > > > > > > > >> >> > > pot, I have different readings on the
> circuit.
> > > > > > > > > >> >> > > I've added here a link to a part of the
> circuit
> > > > > diagram
> > > > > > > > > >where
> > > > > > > > > >> >> I've
> > > > > > > > > >> >> > > indicated some measurements done in both
> > > minimum and
> > > > > > > > > >maximum
> > > > > > > > > >> >> > > position of the frequency coarse potmeter. I
> > > hope
> > > > > > somebody
> > > > > > > > > >can
> > > > > > > > > >> >> give
> > > > > > > > > >> >> > > me clue where more or less the problem
> should be
> > > > > with
> > > > > > this
> > > > > > > > > >> >data.
> > > > > > > > > >> >> > > Thanks a lot in advance, you can find the
> > > drawing
> > > > > here :
> > > > > > > > > >> >> > >
> > > > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > > > > > > > >> >> > >
> > > > > > > > > >> >> > > steven
> > > > > > > > > >> >> > >
> > > > > > > > > >> >> > >
> > > > > > > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo Fahl
> > > > > <rfahl@>
> > > > > > > > wrote:
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > > one thing to keep in mind is that CA3140s
> are
> > > > > super
> > > > > > > > > >delicate
> > > > > > > > > >> >> ICs.
> > > > > > > > > >> >> > > > They are very sensitive to static, but it
> > > wouldn't
> > > > > > > > > >surprise
> > > > > > > > > >> >me
> > > > > > > > > >> >> if
> > > > > > > > > >> >> > > > hooking up power in reverse was too much
> for
> > > it to
> > > > > > > > handle.
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > > Romeo
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > > > No chips are hot ( and nothing smells
> > > burned )
> > > > > > > > > >> >> > > > > The TL072 seems to working fine, output
> 7
> > > > > follows the
> > > > > > > > > >> >> frequency
> > > > > > > > > >> >> > > > > settings, but on the CA3140 I always
> measure
> > > > > 0.56
> > > > > > V on
> > > > > > > > > >pin
> > > > > > > > > >> >2
> > > > > > > > > >> >> and
> > > > > > > > > >> >> > > 1.1
> > > > > > > > > >> >> > > > > V on pin 6 regardless of the frequency
> > > setting.
> > > > > Would
> > > > > > > > > >this
> > > > > > > > > >> >> > > indicate
> > > > > > > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > > > > > > >> >> > > > > thanks !
> > > > > > > > > >> >> > > > > steven
> > > > > > > > > >> >> > > > >
> > > > > > > > > >> >> > > > > --- In cgs_synth@yahoogroups.com,
> sasami@
> > > wrote:
> > > > > > > > > >> >> > > > > >
> > > > > > > > > >> >> > > > > > Test #1 - feel if any chip is getting
> > > hot. If
> > > > > > it is,
> > > > > > > > > >> >> replace
> > > > > > > > > >> >> > > it.
> > > > > > > > > >> >> > > > > >
> > > > > > > > > >> >> > > > > > Ken
> > > > > > > > > >> >> > > > > >
> > > > > > > > > >> >> > > > > > >when i wanted to test my bin-n-tic, i
> > > > > incidently
> > > > > > > > > >> >switched
> > > > > > > > > >> >> +
> > > > > > > > > >> >> > > and -
> > > > > > > > > >> >> > > > > > >power supply. after i fixed the
> problem,
> > > I
> > > > > have no
> > > > > > > > > >sound
> > > > > > > > > >> >> > > > > whatsoever.
> > > > > > > > > >> >> > > > > > >I measured 1.1 volt between pin6 of
> the
> > > > > ca3140.
> > > > > > > > > >> >> > > > > > >Is there any part(s) that is the most
> > > likely
> > > > > to be
> > > > > > > > > >> >> damaged ?
> > > > > > > > > >> >> > > > > > >thx,
> > > > > > > > > >> >> > > > > > >steven
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com,
> > > "kopernig"
> > > > > > > > > >> ><6079smith@>
> > > > > > > > > >> >> > > wrote:
> > > > > > > > > >> >> > > > > > >>
> > > > > > > > > >> >> > > > > > >> yes, i noticed the diode and put
> in a
> > > > > jumper...
> > > > > > > > > >but
> > > > > > > > > >> >> still no
> > > > > > > > > >> >> > > > > joy. i
> > > > > > > > > >> >> > > > > > >> don't have a scope (yet) but the
> > > voltage
> > > > > on pin
> > > > > > > > > >six
> > > > > > > > > >> >of
> > > > > > > > > >> >> the
> > > > > > > > > >> >> > > > > ca3140
> > > > > > > > > >> >> > > > > > >is
> > > > > > > > > >> >> > > > > > >> just under 1 volt. with an audio
> probe
> > > i
> > > > > can
> > > > > > > > > >(barely)
> > > > > > > > > >> >> hear
> > > > > > > > > >> >> > > a cv
> > > > > > > > > >> >> > > > > > >click.
> > > > > > > > > >> >> > > > > > >> so the vco is not oscillating. i
> can't
> > > > > > figure out
> > > > > > > > > >why
> > > > > > > > > >> >> the
> > > > > > > > > >> >> > > 2n2
> > > > > > > > > >> >> > > > > > >> capacitor seems to be shorted...
> > > there's no
> > > > > > > > > >> >resistance
> > > > > > > > > >> >> > > between
> > > > > > > > > >> >> > > > > the
> > > > > > > > > >> >> > > > > > >> source and drain of the fet.
> nothing is
> > > > > > > > physically
> > > > > > > > > >> >> shorted.
> > > > > > > > > >> >> > > a
> > > > > > > > > >> >> > > > > dead
> > > > > > > > > >> >> > > > > > >> fet? any ideas?
> > > > > > > > > >> >> > > > > > >> andrew.
> > > > > > > > > >> >> > > > > > >>
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > > > > > > >> >http://www.cgs.synth.net/
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >Yahoo! Groups Links
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > > >
> > > > > > > > > >> >> > > > > >
> > > > > > > > > >> >> > > > >
> > > > > > > > >
> > > >__________________________________________________________
> > > > > > > > > >> >> > > > > __
> > > > > > > > > >> >> > > > > > Ken Stone sasami@
> > > > > > > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > > > > >> >> > > > > >
> > > > > > > > > >> >> > > > >
> > > > > > > > > >> >> > > > >
> > > > > > > > > >> >> > > > >
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > > > [Non-text portions of this message have
> been
> > > > > removed]
> > > > > > > > > >> >> > > >
> > > > > > > > > >> >> > >
> > > > > > > > > >> >> >
> > > > > > > > > >> >>
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >The CGS Modular Synth home page:
> > > http://www.cgs.synth.net/
> > > > > > > > > >> >
> > > > > > > > > >> >Yahoo! Groups Links
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >>
> > > > > > > > >
> > > >__________________________________________________________
> > > > > > > > > >__
> > > > > > > > > >> Ken Stone sasami@
> > > > > > > > > >> Modular Synth PCBs for sale
> > > > > > > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > > >> Australian Miniature Horses & Ponies
> > > > > > > > > ><http://www.blaze.net.au/~sasami/>
> > > > > > > > > >>
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >The CGS Modular Synth home page:
> > > http://www.cgs.synth.net/
> > > > > > > > > >
> > > > > > > > > >Yahoo! Groups Links
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> __________________________________________________________
> > > > > > > > > Ken Stone sasami@
> > > > > > > > > Modular Synth PCBs for sale
> > > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > > Australian Miniature Horses & Ponies
> > > > > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > > [Non-text portions of this message have been removed]
> > > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>

[Non-text portions of this message have been removed]

--- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
>
> Are any of the middle pins on your PCB-mounted pots shorting with a
> side pin? Sometimes the thicker upper part of the pin can touch the
> extra pad next to it on the top-side of the board. I've never had it
> happen, but someone else has.
>
> Scott Deyo
> The Bridechamber
> contact@...
> http://www.bridechamber.com
> Jealous Edison Record Kompany
> http://www.jealousedison.com
>
>
> On Oct 19, 2008, at 4:18 AM, andrewlistmayer wrote:
>
> > Yes, at the low end of the coarse knob, the oscillator is already in
> > the mid to high range. It does nothing til about 9 oclock then it
gets
> > higher, eventually getting so high around 1 oclock that it stops
> > clocking the filter. The only wiring mistake I could see affecting
> > this would be with the tune knobs, but they both have +/- 15 on
either
> > end and go to the coarse and fine tune pads on the PCB :S I've
already
> > checked the CV summing sections for continuity and values(though I
> > didn't unsolder any of the resistors before measuring them) and
didn't
> > find any shorts. I tried adding bigger capacitors in parallel
with the
> > 2n2, but before I could get as low as what you might call a bass
sound
> > it stopped clocking the filter >_<
> >
> > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > >
> > > So the frequency of the oscillator outputs is high, right?
> > > I'm not sure what would cause that.
> > > Any wiring mistakes? I usually try to make at least one on each
> > Bintic
> > > : )
> > >
> > > Scott Deyo
> > > The Bridechamber
> > > contact@
> > > http://www.bridechamber.com
> > > Jealous Edison Record Kompany
> > > http://www.jealousedison.com
> > >
> > >
> > > On Oct 18, 2008, at 1:02 AM, andrewlistmayer wrote:
> > >
> > > > The filter sounds wild and wacky! Like a cross between hard sync
> > and
> > > > phasing, but it doesn't do much until the bandwidth is turned up
> > > > pretty high, so I think it is supposed to be clocked slower. I
> > turned
> > > > the zero trimmer all the way down and that just increases the
dead
> > > > area at the beginning of the knob turn, before the frequency
> > starts
> > > > getting higher. I also tried applying negative CV; no dice. It
> > doesn't
> > > > want to go any slower :S
> > > >
> > > > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@> wrote:
> > > > >
> > > > > That is strange.
> > > > > How does the filter section sound?
> > > > >
> > > > > Scott Deyo
> > > > > The Bridechamber
> > > > > contact@
> > > > > http://www.bridechamber.com
> > > > > Jealous Edison Record Kompany
> > > > > http://www.jealousedison.com
> > > > >
> > > > >
> > > > > On Oct 16, 2008, at 2:06 AM, andrewlistmayer wrote:
> > > > >
> > > > > > Doh! I just had to re-install that pesky resistor to get the
> > > > filter
> > > > > > clocking, but the minimum pitch of the oscillator is still
> > very
> > > > high,
> > > > > > even after turning the zero trimmer all the way down.
> > > > > >
> > > > > > --- In cgs_synth@yahoogroups.com, "andrewlistmayer"
> > > > > > <andrewlistmayer@> wrote:
> > > > > > >
> > > > > > > Ahh, thanks. Now it's oscillating alright, but really high
> > > > pitched
> > > > > > and
> > > > > > > not affecting the filter section. I guess this means I
have
> > a
> > > > > > > 4024-based problem. I'll look into it and collect some more
> > > > data in
> > > > > > > case I still need help.
> > > > > > >
> > > > > > > --- In cgs_synth@yahoogroups.com, Scott Deyo <contact@>
> > wrote:
> > > > > > > >
> > > > > > > > Dang! I forgot about a little boo-boo on the PCB. Link
> > +15V
> > > > to pin
> > > > > > 1 of
> > > > > > > > the LM311 and you should be good to go.
> > > > > > > > It's not connected to anything right now... sorry!
> > > > > > > >
> > > > > > > > Cheers,
> > > > > > > > Scott Deyo
> > > > > > > > The Bridechamber
> > > > > > > > contact@
> > > > > > > > http://www.bridechamber.com
> > > > > > > > Jealous Edison Record Kompany
> > > > > > > > http://www.jealousedison.com
> > > > > > > >
> > > > > > > >
> > > > > > > > On Oct 15, 2008, at 2:21 AM, andrewlistmayer wrote:
> > > > > > > >
> > > > > > > > > I just read through this old thread because I have a
> > similar
> > > > > > problem
> > > > > > > > > with my Bi-n-Tic. I can get a filter sweep out of the
> > last
> > > > 20%
> > > > > > or so
> > > > > > > > > of the bandwidth knob, but the tuning knobs do nothing.
> > This
> > > > > > leads me
> > > > > > > > > to believe that the center frequency is stuck somewhere
> > > > below
> > > > > > the
> > > > > > > > > audio range. So, I check the oscillator section. I also
> > > > have a
> > > > > > slight
> > > > > > > > > amount of DC on pin6 of CA3140, so it isn't
> > oscillating. I
> > > > also
> > > > > > have
> > > > > > > > > voltage on pin 2, which is supposed to be at 0. Then, I
> > > > start
> > > > > > at the
> > > > > > > > > beginning and try to figure out what is wrong. I can
> > find no
> > > > > > > faults in
> > > > > > > > > the CV summing section, yet I only get between -.8 and
> > > > barely
> > > > > > > above 0v
> > > > > > > > > depending on the coarse tune pot. Is this correct?
> > Also, I
> > > > am
> > > > > > not
> > > > > > > > > getting +15 on pin 1 of the LM311 like it shows on the
> > > > > > schematic. The
> > > > > > > > > datasheet tells me this is a ground pin, so I'm not
> > sure how
> > > > > > > important
> > > > > > > > > this is. I'm using a PN4391 fet and I matched the G, S
> > and
> > > > D on
> > > > > > the
> > > > > > > > > PCB with the pinout on the fairchild datasheet. One
last
> > > > thing
> > > > > > to
> > > > > > > note
> > > > > > > > > is that I'm using the bridechamber PCB. I didn't know
> > what
> > > > to do
> > > > > > > about
> > > > > > > > > the 100k resistor marked with a star, so I installed,
> > then
> > > > > > removed it
> > > > > > > > > afterwards.
> > > > > > > > >
> > > > > > > > > I'm stumped at this point, so any hints would be
greatly
> > > > > > appreciated.
> > > > > > > > >
> > > > > > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > > > > >
> > > > > > > > > > Check your capacitor too. Make sure it is the right
> > size.
> > > > > > Make sure
> > > > > > > > > it is
> > > > > > > > > > actually soldered in - no bad joints, or not between
> > the
> > > > wrong
> > > > > > > > > holes. there
> > > > > > > > > > is a spare hole there to allow for different sizes.
> > If you
> > > > > > have
> > > > > > > the
> > > > > > > > > cap
> > > > > > > > > > between two the holes that are joined by the
> > trackwork, it
> > > > > > isn't
> > > > > > > > > going to work.
> > > > > > > > > >
> > > > > > > > > > Also note that the pin-outs of different FETs varies.
> > If I
> > > > > > use the
> > > > > > > > > 2n4091, I
> > > > > > > > > > need to install it "backwards" to the marking on the
> > PCB.
> > > > > > > > > >
> > > > > > > > > > Ken
> > > > > > > > > >
> > > > > > > > > > >So, if the voltage on pin 2 & 3 is 0V and the 3140
> > gets
> > > > it's
> > > > > > > > > > >powersupply, it should create some AC voltage on
pin
> > 6 ?
> > > > > > > > > > >I have only a DC voltage that varies between 0 &
> > 0.86 VDC
> > > > > > > > > (depending
> > > > > > > > > > >on the position of the coarse frequency pot )
> > > > > > > > > > >
> > > > > > > > > > >thanks again for your help !
> > > > > > > > > > >steven
> > > > > > > > > > >
> > > > > > > > > > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > > > > > > > > > >>
> > > > > > > > > > >> You should never see any voltage on pin 2 of the
> > 3140
> > > > - it
> > > > > > is a
> > > > > > > > > > >summing
> > > > > > > > > > >> node. It is a basic op-amp feedback loop. Yhe
opamp
> > > > > > devotes its
> > > > > > > > > > >entire time
> > > > > > > > > > >> truing to keep pins 2 and 3 at exactly the same
> > > > voltage. As
> > > > > > > pin 3
> > > > > > > > > > >is 0v, pin
> > > > > > > > > > >> 2 will be 0v. The current through the point
will of
> > > > course
> > > > > > vary
> > > > > > > > > as
> > > > > > > > > > >the
> > > > > > > > > > >> output of the op-amp fights the current drawn
> > through
> > > > the
> > > > > > LM394
> > > > > > > > > > >(through the
> > > > > > > > > > >> integrating capacitor and through the FET during
> > > > reset).
> > > > > > > > > > >>
> > > > > > > > > > >> Ken
> > > > > > > > > > >>
> > > > > > > > > > >> >hello,
> > > > > > > > > > >> >no luck so far, I've replaced the 2N4391 fet, but
> > > > still no
> > > > > > > > > > >voltage
> > > > > > > > > > >> >on pin 2 of the ca3140. I've also measured with a
> > > > scope
> > > > > > to see
> > > > > > > > > > >what
> > > > > > > > > > >> >is exactly the output on pin 6 of the ca3140,
and
> > it
> > > > shows
> > > > > > > only
> > > > > > > > > a
> > > > > > > > > > >dc
> > > > > > > > > > >> >voltage ( 0.86 V )
> > > > > > > > > > >> >
> > > > > > > > > > >> >any more clues ?
> > > > > > > > > > >> >many thanks in advance !
> > > > > > > > > > >> >steven
> > > > > > > > > > >> >
> > > > > > > > > > >> >--- In cgs_synth@yahoogroups.com, "stiebz"
> > > > > > <theevaporizer@>
> > > > > > > > > wrote:
> > > > > > > > > > >> >>
> > > > > > > > > > >> >> hey,
> > > > > > > > > > >> >>
> > > > > > > > > > >> >> I used a 2n4391, I have no clue how I can
check
> > if
> > > > it
> > > > > > > still is
> > > > > > > > > > >> >> working properly, so I'll try to replace this
> > > > > > compontent to
> > > > > > > > > see
> > > > > > > > > > >if
> > > > > > > > > > >> >it
> > > > > > > > > > >> >> makes a difference.
> > > > > > > > > > >> >>
> > > > > > > > > > >> >> thanks,
> > > > > > > > > > >> >> steven
> > > > > > > > > > >> >>
> > > > > > > > > > >> >> --- In cgs_synth@yahoogroups.com, "bbluthang"
> > > > > > <jumpswine@>
> > > > > > > > > > >wrote:
> > > > > > > > > > >> >> >
> > > > > > > > > > >> >> > Hi
> > > > > > > > > > >> >> > look at the FET, what kind are you using?
> > right
> > > > way
> > > > > > around
> > > > > > > > > etc
> > > > > > > > > > >> >> > some FETS wont work in these ccts.
> > > > > > > > > > >> >> > Andrew
> > > > > > > > > > >> >> >
> > > > > > > > > > >> >> >
> > > > > > > > > > >> >> > --- In cgs_synth@yahoogroups.com, "stiebz"
> > > > > > <theevaporizer@>
> > > > > > > > > > >> >wrote:
> > > > > > > > > > >> >> > >
> > > > > > > > > > >> >> > > unfortunately my bintic filter is still not
> > > > > > working...
> > > > > > > > > > >> >> > > I've replaced the tl072, ca3140 and the
> > lm394,
> > > > but
> > > > > > still
> > > > > > > > > > >the
> > > > > > > > > > >> >> > > oscillator part is not working as expected.
> > > > > > > > > > >> >> > > I've noticed that depending on the setting
> > of
> > > > the
> > > > > > > > > frequency
> > > > > > > > > > >> >> coarse
> > > > > > > > > > >> >> > > pot, I have different readings on the
> > circuit.
> > > > > > > > > > >> >> > > I've added here a link to a part of the
> > circuit
> > > > > > diagram
> > > > > > > > > > >where
> > > > > > > > > > >> >> I've
> > > > > > > > > > >> >> > > indicated some measurements done in both
> > > > minimum and
> > > > > > > > > > >maximum
> > > > > > > > > > >> >> > > position of the frequency coarse
potmeter. I
> > > > hope
> > > > > > > somebody
> > > > > > > > > > >can
> > > > > > > > > > >> >> give
> > > > > > > > > > >> >> > > me clue where more or less the problem
> > should be
> > > > > > with
> > > > > > > this
> > > > > > > > > > >> >data.
> > > > > > > > > > >> >> > > Thanks a lot in advance, you can find the
> > > > drawing
> > > > > > here :
> > > > > > > > > > >> >> > >
> > > > > > http://users.telenet.be/theevaporizer/modular/bintic.GIF
> > > > > > > > > > >> >> > >
> > > > > > > > > > >> >> > > steven
> > > > > > > > > > >> >> > >
> > > > > > > > > > >> >> > >
> > > > > > > > > > >> >> > > --- In cgs_synth@yahoogroups.com, Romeo
Fahl
> > > > > > <rfahl@>
> > > > > > > > > wrote:
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > > one thing to keep in mind is that
CA3140s
> > are
> > > > > > super
> > > > > > > > > > >delicate
> > > > > > > > > > >> >> ICs.
> > > > > > > > > > >> >> > > > They are very sensitive to static, but it
> > > > wouldn't
> > > > > > > > > > >surprise
> > > > > > > > > > >> >me
> > > > > > > > > > >> >> if
> > > > > > > > > > >> >> > > > hooking up power in reverse was too much
> > for
> > > > it to
> > > > > > > > > handle.
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > > Romeo
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > > On Nov 4, 2006, at 6:08 AM, stiebz wrote:
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > > > No chips are hot ( and nothing smells
> > > > burned )
> > > > > > > > > > >> >> > > > > The TL072 seems to working fine,
output
> > 7
> > > > > > follows the
> > > > > > > > > > >> >> frequency
> > > > > > > > > > >> >> > > > > settings, but on the CA3140 I always
> > measure
> > > > > > 0.56
> > > > > > > V on
> > > > > > > > > > >pin
> > > > > > > > > > >> >2
> > > > > > > > > > >> >> and
> > > > > > > > > > >> >> > > 1.1
> > > > > > > > > > >> >> > > > > V on pin 6 regardless of the frequency
> > > > setting.
> > > > > > Would
> > > > > > > > > > >this
> > > > > > > > > > >> >> > > indicate
> > > > > > > > > > >> >> > > > > a faillure on the CA3140 or the LM394 ?
> > > > > > > > > > >> >> > > > > thanks !
> > > > > > > > > > >> >> > > > > steven
> > > > > > > > > > >> >> > > > >
> > > > > > > > > > >> >> > > > > --- In cgs_synth@yahoogroups.com,
> > sasami@
> > > > wrote:
> > > > > > > > > > >> >> > > > > >
> > > > > > > > > > >> >> > > > > > Test #1 - feel if any chip is getting
> > > > hot. If
> > > > > > > it is,
> > > > > > > > > > >> >> replace
> > > > > > > > > > >> >> > > it.
> > > > > > > > > > >> >> > > > > >
> > > > > > > > > > >> >> > > > > > Ken
> > > > > > > > > > >> >> > > > > >
> > > > > > > > > > >> >> > > > > > >when i wanted to test my
bin-n-tic, i
> > > > > > incidently
> > > > > > > > > > >> >switched
> > > > > > > > > > >> >> +
> > > > > > > > > > >> >> > > and -
> > > > > > > > > > >> >> > > > > > >power supply. after i fixed the
> > problem,
> > > > I
> > > > > > have no
> > > > > > > > > > >sound
> > > > > > > > > > >> >> > > > > whatsoever.
> > > > > > > > > > >> >> > > > > > >I measured 1.1 volt between pin6 of
> > the
> > > > > > ca3140.
> > > > > > > > > > >> >> > > > > > >Is there any part(s) that is the
most
> > > > likely
> > > > > > to be
> > > > > > > > > > >> >> damaged ?
> > > > > > > > > > >> >> > > > > > >thx,
> > > > > > > > > > >> >> > > > > > >steven
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >--- In cgs_synth@yahoogroups.com,
> > > > "kopernig"
> > > > > > > > > > >> ><6079smith@>
> > > > > > > > > > >> >> > > wrote:
> > > > > > > > > > >> >> > > > > > >>
> > > > > > > > > > >> >> > > > > > >> yes, i noticed the diode and put
> > in a
> > > > > > jumper...
> > > > > > > > > > >but
> > > > > > > > > > >> >> still no
> > > > > > > > > > >> >> > > > > joy. i
> > > > > > > > > > >> >> > > > > > >> don't have a scope (yet) but the
> > > > voltage
> > > > > > on pin
> > > > > > > > > > >six
> > > > > > > > > > >> >of
> > > > > > > > > > >> >> the
> > > > > > > > > > >> >> > > > > ca3140
> > > > > > > > > > >> >> > > > > > >is
> > > > > > > > > > >> >> > > > > > >> just under 1 volt. with an audio
> > probe
> > > > i
> > > > > > can
> > > > > > > > > > >(barely)
> > > > > > > > > > >> >> hear
> > > > > > > > > > >> >> > > a cv
> > > > > > > > > > >> >> > > > > > >click.
> > > > > > > > > > >> >> > > > > > >> so the vco is not oscillating. i
> > can't
> > > > > > > figure out
> > > > > > > > > > >why
> > > > > > > > > > >> >> the
> > > > > > > > > > >> >> > > 2n2
> > > > > > > > > > >> >> > > > > > >> capacitor seems to be shorted...
> > > > there's no
> > > > > > > > > > >> >resistance
> > > > > > > > > > >> >> > > between
> > > > > > > > > > >> >> > > > > the
> > > > > > > > > > >> >> > > > > > >> source and drain of the fet.
> > nothing is
> > > > > > > > > physically
> > > > > > > > > > >> >> shorted.
> > > > > > > > > > >> >> > > a
> > > > > > > > > > >> >> > > > > dead
> > > > > > > > > > >> >> > > > > > >> fet? any ideas?
> > > > > > > > > > >> >> > > > > > >> andrew.
> > > > > > > > > > >> >> > > > > > >>
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >The CGS Modular Synth home page:
> > > > > > > > > > >> >http://www.cgs.synth.net/
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >Yahoo! Groups Links
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > > >
> > > > > > > > > > >> >> > > > > >
> > > > > > > > > > >> >> > > > >
> > > > > > > > > >
> > > > >__________________________________________________________
> > > > > > > > > > >> >> > > > > __
> > > > > > > > > > >> >> > > > > > Ken Stone sasami@
> > > > > > > > > > >> >> > > > > > Modular Synth PCBs for sale
> > > > > > > > > > >> >> > > > >
<http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > > > >> >> > > > > > Australian Miniature Horses & Ponies
> > > > > > > > > > >> >> > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > > > > > >> >> > > > > >
> > > > > > > > > > >> >> > > > >
> > > > > > > > > > >> >> > > > >
> > > > > > > > > > >> >> > > > >
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > > > [Non-text portions of this message have
> > been
> > > > > > removed]
> > > > > > > > > > >> >> > > >
> > > > > > > > > > >> >> > >
> > > > > > > > > > >> >> >
> > > > > > > > > > >> >>
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >> >The CGS Modular Synth home page:
> > > > http://www.cgs.synth.net/
> > > > > > > > > > >> >
> > > > > > > > > > >> >Yahoo! Groups Links
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >> >
> > > > > > > > > > >>
> > > > > > > > > >
> > > > >__________________________________________________________
> > > > > > > > > > >__
> > > > > > > > > > >> Ken Stone sasami@
> > > > > > > > > > >> Modular Synth PCBs for sale
> > > > > > > > > > ><http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > > > >> Australian Miniature Horses & Ponies
> > > > > > > > > > ><http://www.blaze.net.au/~sasami/>
> > > > > > > > > > >>
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >The CGS Modular Synth home page:
> > > > http://www.cgs.synth.net/
> > > > > > > > > > >
> > > > > > > > > > >Yahoo! Groups Links
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > __________________________________________________________
> > > > > > > > > > Ken Stone sasami@
> > > > > > > > > > Modular Synth PCBs for sale
> > > > > > > <http://www.blaze.net.au/~sasami/synth/>
> > > > > > > > > > Australian Miniature Horses & Ponies
> > > > > > > > > <http://www.blaze.net.au/~sasami/>
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > > [Non-text portions of this message have been removed]
> > > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > > [Non-text portions of this message have been removed]
> > > > >
> > > >
> > > >
> > > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>

--- In cgs_synth@yahoogroups.com, Tom Adam <tom.adam@...> wrote:
>
> I'm about to build my bi-n-tic and I came across this link.
> Check the clock driver mod. Is this what you're seeing?
>
> http://modularsynthesis.com/cgs/bi-n-tic/bi-n-tic.htm
>
> Cheers,
> ToAd
>

> My VCO didn't run correctly the first time either. With a scope I
> could see that the ramp output of the VCO (pin 6 of the CA3140) was
> very low amplitude. I replaced the MPF102 with a different FET and
> it worked fine. I have no idea why the original FET didn't work.
>
> The clock mod is for very low frequency response. The clock is
> capacitive coupled and there just isn't enough voltage swing to
> trigger the clock input of the 4024 at VERY low frequencies. I DC
> coupled mine so it wouldn't be an issue.
>
> Richard Brewster later posted something with the PCB trace not
> matching the schematic in this area. I don't know if he had an early
> PCB or what the issue was. Search for message 2164. This only
> affects the output of the 4024, not the VCO output.
>
> Check the VCO output on pin 6 of the CA3140. You can just connect
> this to an amplifier through a suitable capacitor to remove the DC
> bias. This needs to be working correctly before verifying the 4024.
> If it was like mine and only had 1V pk-pk - then the low frequency
> range is quite limited. It also could be an issue with the LM311
> voltage comparator.
>
> Dave
>
> --- In cgs_synth@yahoogroups.com, Tom Adam <tom.adam@...> wrote:
>
>> I'm about to build my bi-n-tic and I came across this link.
>> Check the clock driver mod. Is this what you're seeing?
>>
>> http://modularsynthesis.com/cgs/bi-n-tic/bi-n-tic.htm
>>
>> Cheers,
>> ToAd
>>
>>

--- In cgs_synth@yahoogroups.com, "djbrow54" <davebr@...> wrote:
>
> My VCO didn't run correctly the first time either. With a scope I
> could see that the ramp output of the VCO (pin 6 of the CA3140) was
> very low amplitude. I replaced the MPF102 with a different FET and
> it worked fine. I have no idea why the original FET didn't work.
>
> The clock mod is for very low frequency response. The clock is
> capacitive coupled and there just isn't enough voltage swing to
> trigger the clock input of the 4024 at VERY low frequencies. I DC
> coupled mine so it wouldn't be an issue.
>
> Richard Brewster later posted something with the PCB trace not
> matching the schematic in this area. I don't know if he had an early
> PCB or what the issue was. Search for message 2164. This only
> affects the output of the 4024, not the VCO output.
>
> Check the VCO output on pin 6 of the CA3140. You can just connect
> this to an amplifier through a suitable capacitor to remove the DC
> bias. This needs to be working correctly before verifying the 4024.
> If it was like mine and only had 1V pk-pk - then the low frequency
> range is quite limited. It also could be an issue with the LM311
> voltage comparator.
>
> Dave
>
> --- In cgs_synth@yahoogroups.com, Tom Adam <tom.adam@> wrote:
> >
> > I'm about to build my bi-n-tic and I came across this link.
> > Check the clock driver mod. Is this what you're seeing?
> >
> > http://modularsynthesis.com/cgs/bi-n-tic/bi-n-tic.htm
> >
> > Cheers,
> > ToAd
> >
>