Cgs synth

>
> >I've just finished wiring my gated comparator and I've got problems.
> >I cant get past stage one--I get leds lit on stage one and the output.
> >
> >1. My board says "rev 1". Is this *not* the rev 1.1? (do i need the
> >mod?)
>
> Current boards say "rev 1". I should make the text clearer. The mod

> needed.
>
> >2. I'm using an LM358n on the board. I'm aware that a tl072 is a
> >better choice and I'll replace it if I need to.
>
> Quite possibly. It sounds like your clock signal is not getting through.
> Also check you have your "sense" input set at an appropriate level.
>
> Ken

>OK--I've finally replaced the LM358 with a TL072...and I still cant
>get past stage one--I get leds lit on stage one and the output only.
>I've tried different threshold level settings with the pot. Any help
>is appreciated--I'm just getting started with DIY and (particularly
>new to) troubleshooting. Thanks!
>

> The first thing you need is a way of seeing what is happening on the various
> pins of the ICs. If you don't have a logic probe, run a cord from your VCO
> pitch input, connecting a 100k resistor to the tip of the cord (use an
> aligator clip), and use the other end of the resistor as your probe. The VCO
> and ther module you are trying to fix need to be running on the same PSU or
> have their 0V rails connected. The pitch of the oscillator will tell you
> what is happening at the pins. Don't think you can use a multimeter instead
> - their response is too slow.
> Now start at one side of the schematic, and work out what that part is meant
> to do. Make sure it is doing it. If not, fix it. When that works, move to
> the next bit!
>
> Ken
>
>
> >OK--I've finally replaced the LM358 with a TL072...and I still cant
> >get past stage one--I get leds lit on stage one and the output only.
> >I've tried different threshold level settings with the pot. Any help
> >is appreciated--I'm just getting started with DIY and (particularly
> >new to) troubleshooting. Thanks!
> >
> _______________________________________________________________________
> Ken Stone sasami@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
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