Yahoo Groups archive

Cgs synth

Index last updated: 2026-04-28 23:16 UTC

Thread

VCs End Out Problem

VCs End Out Problem

2009-09-24 by colorful.bottle

Hello All,

Having a bit of trouble...my End Out seems to be putting out a constant ~8V output. It follows the input inversely. When I gate the input with 5V it will go to 0V according to the Rise pot and return to ~8V according to the Fall pot.

I am breadboarding the circuit and not working from the PCB. I wanted to learn more about the different aspects of the circuit but this part has proven to be very hard to troubleshoot.

Any thoughts?

Thanks,
-dustin

Re: VCs End Out Problem

2009-09-29 by colorful.bottle

Still staring at this circuit. I'm determined to figure it out :)

Is the End Out supposed to act like a flip flop?

Is Pin 1 of the LM3900 supposed to be tied to ground?

Thanks for any and all suggestions,
-dustin
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, "colorful.bottle" <colorful.bottle@...> wrote:
>
> Hello All,
>
> Having a bit of trouble...my End Out seems to be putting out a constant ~8V output. It follows the input inversely. When I gate the input with 5V it will go to 0V according to the Rise pot and return to ~8V according to the Fall pot.
>
> I am breadboarding the circuit and not working from the PCB. I wanted to learn more about the different aspects of the circuit but this part has proven to be very hard to troubleshoot.
>
> Any thoughts?
>
> Thanks,
> -dustin
>

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.