Cgs synth

Check your wiring. Make sure you haven't got your pot and trigger wires swapped.
Ken

>Not sure if this is the best way to do this ? but figured if someone in the

future searches better to have a few problems in 1 thread.

>
>Anyhow, i have 1 (1/2 of the board) of my dusg's working perfectly and the

other not working at all as expected.

>The problem is no recognition of a trigger input or signal in for that

matter unless i have the fall pot full cw then it seems to go into a slow
self cycling.It needs a trigger to start this but does not sync with the
trigger at all.As soon as i back off to about 2-3 o'clock it stops.

>
>These are the things i have checked/verified against the working half:
>
>-All ic;s getting and sending the same voltages as working half
>-Diode orientations
>-resitor values
>-Transistor orientation,proper part,voltages the same as working half
>-continuity through path of trig in to output
>-checked for solder bridges
>
>I'm out of ideas so i will really appreciate it if someone has some advice !
>
>Thanks, Tony
>
>--- In cgs_synth@yahoogroups.com, richmolindarius@... wrote:
>>
>> Fully agreed. The USG is my fave by far with the SSG following up in a

close 2nd. :D

>>
>> On 2012-10-11, at 12:06 AM, Stephen Richards wrote:
>>
>> > My all time favourite Serge function block , DUSG rocks.
>> >
>> > ________________________________
>> > From: Rico Loverde
>> > To: cgs_synth@yahoogroups.com
>> > Sent: Thursday, October 11, 2012 1:51 PM
>> > Subject: Re: [cgs_synth] Re: CGS114 DUSG problems/troubleshooting
>> >
>> > awesome!!!
>> >
>> > On Wed, Oct 10, 2012 at 7:26 PM, ch1nard wrote:
>> >
>> > > **
>> > >
>> > >
>> > >
>> > > okay awesome, that was totally it
>> > >
>> > > Now other than the fact that i have the pots wired backwards DUSG seems
>> > > functional!
>> > >
>> > > --- In cgs_synth@yahoogroups.com, "ch1nard" wrote:
>> > > >
>> > > > ah yes, you appear to be correct good sir :)
>> > > > this would be reverse orientation for all trannies? (2N3904 and 2N3906)
>> > > >
>> > > > i will switch them around after i get home from work and see if that
>> > > fixes things up.
>> > > >
>> > > > might need to hit up the parts store on the way home in case i pooched
>> > > any of them from being in backwards
>> > > >
>> > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
>> > > > >
>> > > > > Also make sure you are using the right sort of tranny! I had people
>> > > with
>> > > > > this problem on another project - and they had used the wrong sort of
>> > > tranny.
>> > > > >
>> > > > > >Are the trannies situated like the silk screen on the pcb or
>> > > reversed? They
>> > > > > >should be reversed.
>> > > > > >
>> > > > > >
>> > > > > >
>> > > > > >On Tuesday, October 9, 2012, ch1nard wrote:
>> > > > > >
>> > > > > >> **
>> > > > > >>
>> > > > > >>
>> > > > > >> Okay, i have been staring at this for almost a week without making
>> > > any
>> > > > > >> progress so its time to start asking around for help on figuring
>> > > out what
>> > > > > >> might be wrong with my DUSG build
>> > > > > >>
>> > > > > >> I am running this off +/-15v power supply and i have all the
>> > > connections
>> > > > > >> appear to be correct with no magic smoke escaping
>> > > > > >>
>> > > > > >> What is happening is that the output lights are lit up constantly.
>> > > > > >> When i hook it up to a scope it appears that both halves are

cycling

>> > > > > >> (triangle) at about only 300mV p/p
>> > > > > >> -fiddling with the rise/fall gives minor variations but is still a
>> > > > > >> triangle. (never hits saw or ramp)
>> > > > > >> -feeding LFO into VC in shows the same minor variances as fiddling
>> > > with
>> > > > > >> the rise/fall knobs. bipolar control seems to work
>> > > > > >> -feeding a signal IN combines the signal with this triangle
>> > > oscillation
>> > > > > >> -trig and end do nothing
>> > > > > >>
>> > > > > >> now everything 'appears' to be wired up correctly and there were a
>> > > couple
>> > > > > >> of lifted pads that i was able to jumper patch around.
>> > > > > >> building this as part of a 'best of cgs' BOG panel, so the wiring
>> > > is well
>> > > > > >> documented.
>> > > > > >>
>> > > > > >> I have verified +/- voltage being delivered to all the TL072's and
>> > > > > >> verified + voltage for the LM3900's
>> > > > > >> ground appears to be delivered as well.
>> > > > > >> all the trans are correct value and orientation (2N3904 and

2N3906)

>> > > where
>> > > > > >> applicable
>> > > > > >>
>> > > > > >> Anyways, eyes are too tired to look at this anymore tonight...
>> > > > > >> time to smoke a bowl and watch some doctor who.
>> > > > > >>
>> > > > > >>
>> > > > > >>
>> > > > > >
>> > > > > >
>> > > > > >--
>> > > > > >________________
>> > > > > >rico loverde
>> > > > > >415.596.6255
>> > > > > >ricoloverde.com
>> > > > > >
>> > > > > >
>> > > > > >[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@ otherunicorn@
>> > > > > Modular Synth PCBs for sale
>> > > > > Australian Miniature Horses & Ponies
> > > >
>> > > > >
>> > > >
>> > >
>> > >
>> > >
>> >
>> > --
>> > ________________
>> > rico loverde
>> > 415.596.6255
>> > ricoloverde.com
>> >
>> > [Non-text portions of this message have been removed]
>> >
>> > ------------------------------------
>> >
>> > The CGS Modular Synth home page: http://www.cgs.synth.net/
>> > Yahoo! Groups Links
>> >
>> > [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
>
>
>
>

_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>