Cgs synth

On Apr 3, 2009, at 15:36, w1xyzq wrote:

> I'm just getting back to building my synth. I was looking through my
> parts to see what I need to order, and most of my logic chips are
> labeled HC4015, etc. I was kicking myslef, because I want the CD part.
> BUT.. then I was looking at my modules, and most are built w/ the HC
> part. So, I look up the datasheet for the IC, which is a STMicro, and
> it does say 5, 10, 15 volts. (and my modules work)
>
> so, do these just have a different naming convention, or am I missing
> something?
>
>

On Sat, Apr 4, 2009 at 8:47 PM, James Elliott <johans121@...> wrote:

> Hello,
>
> Newbie here....
>
> I just got through building the Burst Generator and everything seems to be
> working fine except for the internal clock. It doesn't seem to be
> oscillating. I've spent the last 3 hours looking it over & honestly I'm too
> much of a newbie to even know how to properly troubleshoot this beyond the
> basics.
>
> -All resistor & capacitor values are correct
> -All diodes are oriented correctly (and are the correct type)
> -Solder connections have been checked for connectivity between pads
> -I am using a 2Meg pot for the internal clock's speed - only two wires
> soldered, one to the middle lug, and another to a side lug. Both wires are
> going to the "pot" pads on the PCB
> -pin 6 of the 106 seems to stay high all the time
>
> I do have a scope, and I've tested everything out with an external clock
> and I can see that the main bulk of the circuit is working.
>
> Can someone give me some tips on where to start looking?
> Also, can someone please explain to me how the clock works so I can make
> sense of it for future applicaions?
>
> Thanks,
> Jim
>
> [Non-text portions of this message have been removed]
>
>
>


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

On Sat, Apr 4, 2009 at 8:47 PM, James Elliott <johans121@yahoo. com> wrote:

> Hello,
>
> Newbie here....
>
> I just got through building the Burst Generator and everything seems to be
> working fine except for the internal clock. It doesn't seem to be
> oscillating. I've spent the last 3 hours looking it over & honestly I'm too
> much of a newbie to even know how to properly troubleshoot this beyond the
> basics.
>
> -All resistor & capacitor values are correct
> -All diodes are oriented correctly (and are the correct type)
> -Solder connections have been checked for connectivity between pads
> -I am using a 2Meg pot for the internal clock's speed - only two wires
> soldered, one to the middle lug, and another to a side lug. Both wires are
> going to the "pot" pads on the PCB
> -pin 6 of the 106 seems to stay high all the time
>
> I do have a scope, and I've tested everything out with an external clock
> and I can see that the main bulk of the circuit is working.
>
> Can someone give me some tips on where to start looking?
> Also, can someone please explain to me how the clock works so I can make
> sense of it for future applicaions?
>
> Thanks,
> Jim
>
> [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 Sun, Apr 5, 2009 at 11:42 AM, James Elliott <johans121@...> wrote:

> Lance, I don't think that is correct. The middle lug is is not soldered
> to ground, it is soldered to the one of the two pot pads (middle to the 47k,
> center to the diode & 22k), if I were to bridge the other lug to center,
> then I would have a constant resistance of 2Meg between those components -
> i.e. CW would be 1.5 and CCW would be .5, or CW = .85 & CCW = 1.25 etc....
> Right?
>
> Does that sound right, or am I doing something wrong? From the looks of the
> schematics, only one side lug and the center are used, and the 3rd is tied
> to anything.
>
> Thanks for the help,
> Jim
>
> ________________________________
> From: lance iden <lance.iden@... <lance.iden%40gmail.com>>
> To: cgs_synth@yahoogroups.com <cgs_synth%40yahoogroups.com>
> Sent: Sunday, April 5, 2009 9:36:59 AM
> Subject: Re: [cgs_synth] Burst Generator; Internal Clock Problem....
>
> James. I think that on your speed pot your open terminal needs to be tied
> to
> the center terminal. Just a thought.Lance
>
> On Sat, Apr 4, 2009 at 8:47 PM, James Elliott <johans121@yahoo. com>
> wrote:
>
> > Hello,
> >
> > Newbie here....
> >
> > I just got through building the Burst Generator and everything seems to
> be
> > working fine except for the internal clock. It doesn't seem to be
> > oscillating. I've spent the last 3 hours looking it over & honestly I'm
> too
> > much of a newbie to even know how to properly troubleshoot this beyond
> the
> > basics.
> >
> > -All resistor & capacitor values are correct
> > -All diodes are oriented correctly (and are the correct type)
> > -Solder connections have been checked for connectivity between pads
> > -I am using a 2Meg pot for the internal clock's speed - only two wires
> > soldered, one to the middle lug, and another to a side lug. Both wires
> are
> > going to the "pot" pads on the PCB
> > -pin 6 of the 106 seems to stay high all the time
> >
> > I do have a scope, and I've tested everything out with an external clock
> > and I can see that the main bulk of the circuit is working.
> >
> > Can someone give me some tips on where to start looking?
> > Also, can someone please explain to me how the clock works so I can make
> > sense of it for future applicaions?
> >
> > Thanks,
> > Jim
> >
> > [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]

>Lance, I don't think that is correct. The middle lug is is not soldered to

>
>Does that sound right, or am I doing something wrong? From the looks of the

>
>Thanks for the help,
>Jim
>
>
>
>
>________________________________
>From: lance iden <lance.iden@...>
>To: cgs_synth@yahoogroups.com
>Sent: Sunday, April 5, 2009 9:36:59 AM
>Subject: Re: [cgs_synth] Burst Generator; Internal Clock Problem....
>
>
>James. I think that on your speed pot your open terminal needs to be tied to
>the center terminal. Just a thought.Lance
>
>On Sat, Apr 4, 2009 at 8:47 PM, James Elliott <johans121@yahoo. com> wrote:
>
>> Hello,
>>
>> Newbie here....
>>
>> I just got through building the Burst Generator and everything seems to be
>> working fine except for the internal clock. It doesn't seem to be
>> oscillating. I've spent the last 3 hours looking it over & honestly I'm too
>> much of a newbie to even know how to properly troubleshoot this beyond the
>> basics.
>>
>> -All resistor & capacitor values are correct
>> -All diodes are oriented correctly (and are the correct type)
>> -Solder connections have been checked for connectivity between pads
>> -I am using a 2Meg pot for the internal clock's speed - only two wires
>> soldered, one to the middle lug, and another to a side lug. Both wires are
>> going to the "pot" pads on the PCB
>> -pin 6 of the 106 seems to stay high all the time
>>
>> I do have a scope, and I've tested everything out with an external clock
>> and I can see that the main bulk of the circuit is working.
>>
>> Can someone give me some tips on where to start looking?
>> Also, can someone please explain to me how the clock works so I can make
>> sense of it for future applicaions?
>>
>> Thanks,
>> Jim
>>
>> [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]
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>

>Lance, I don't think that is correct. The middle lug is is not soldered to

>
>Does that sound right, or am I doing something wrong? From the looks of the

>
>Thanks for the help,
>Jim
>
>
>
>
>___________ _________ _________ ___
>From: lance iden <lance.iden@gmail. com>
>To: cgs_synth@yahoogrou ps.com
>Sent: Sunday, April 5, 2009 9:36:59 AM
>Subject: Re: [cgs_synth] Burst Generator; Internal Clock Problem....
>
>
>James. I think that on your speed pot your open terminal needs to be tied to
>the center terminal. Just a thought.Lance
>
>On Sat, Apr 4, 2009 at 8:47 PM, James Elliott <johans121@yahoo. com> wrote:
>
>> Hello,
>>
>> Newbie here....
>>
>> I just got through building the Burst Generator and everything seems to be
>> working fine except for the internal clock. It doesn't seem to be
>> oscillating. I've spent the last 3 hours looking it over & honestly I'm too
>> much of a newbie to even know how to properly troubleshoot this beyond the
>> basics.
>>
>> -All resistor & capacitor values are correct
>> -All diodes are oriented correctly (and are the correct type)
>> -Solder connections have been checked for connectivity between pads
>> -I am using a 2Meg pot for the internal clock's speed - only two wires
>> soldered, one to the middle lug, and another to a side lug. Both wires are
>> going to the "pot" pads on the PCB
>> -pin 6 of the 106 seems to stay high all the time
>>
>> I do have a scope, and I've tested everything out with an external clock
>> and I can see that the main bulk of the circuit is working.
>>
>> Can someone give me some tips on where to start looking?
>> Also, can someone please explain to me how the clock works so I can make
>> sense of it for future applicaions?
>>
>> Thanks,
>> Jim
>>
>> [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]
>
>
>
>----------- --------- --------- -------
>
>The CGS Modular Synth home page: http://www.cgs synth.net/
>Yahoo! Groups Links
>
>
>
>