Hi,
Glad you got #2 working. When you say "removing other PCBs downstream", that could indicate bad grounding practices or a multitude of other issues. Can you elaborate a bit?
I'm not familiar with this particular board but it might be helpful to see clear photos of the board, it's neighbors and the wiring around the area.
Did you use IC sockets? I might try replacing that 3900 with a different one (again).
How good are your soldering skills? Are you comfortable that you can spot a tiny short or bad solder joint. Sorry if that's blunt, but it gives everyone a better idea of your confidence level.
Keep the questions rolling. We're bound to figure it out :-)
Regards,
Doug
Glad you got #2 working. When you say "removing other PCBs downstream", that could indicate bad grounding practices or a multitude of other issues. Can you elaborate a bit?
I'm not familiar with this particular board but it might be helpful to see clear photos of the board, it's neighbors and the wiring around the area.
Did you use IC sockets? I might try replacing that 3900 with a different one (again).
How good are your soldering skills? Are you comfortable that you can spot a tiny short or bad solder joint. Sorry if that's blunt, but it gives everyone a better idea of your confidence level.
Keep the questions rolling. We're bound to figure it out :-)
Regards,
Doug
--- In cgs_synth@yahoogroups.com, "derekatumaticdotnl" <derek@...> wrote:
>
> Second problem of the wobbling voltage fixed by removing some other PCBs further downstream (DC Mixers + Analog Voltage, will be debuggered later), so that VCS works fine. The first one is still kaput however. Suggestions welcome!
>
> D.
>
> --- In cgs_synth@yahoogroups.com, "derekatumaticdotnl" <derek@> wrote:
>
> > The other VCS is even more confusing than the first. Again, input, pots and CV all seem to work, trigger and end out definitely do not. This time, the LED works, but the whole thing seems more like a Source of Uncertainty module! The voltage wobbles all over the place, and seems to be affected by my body resistance/capacitance!
>