Cgs synth

Hi Scott,

Thanks for the confirmation about the switch wiring :) I'm gonna
rewire the Decay an Damper pots too. I've tried various switch
setting from all off to individual on to all on and they all react the
same to the resonance pot.

Is it possible that the wiring diagram is wrong for the res or freq
pots? The freq pot wiring seems a little strange compared to the rest
with the 3 leg of the pot wired to the ferrite bead.

While I'm at it how do I wire the VCF CV pot? Do I wire from EX to
the middle lug of the pot and then from terminal 1 on the pot to the jack?

Thanks,
Dave

--- In cgs_synth@yahoogroups.com, Scott Deyo <contact@...> wrote:
>
> I think Decay and Damper are backwards on the CGS diagram.
>
> It just occured to me that my panel's envelope pot is labeled wrong!
> Instead of 0 to 10, it should read -5 to +5. It should be at 0 in the
> middle, negative envelope to left, positive to right. Ugh!
> : (
>
> It sounds like you have the switches wired up correctly. Try testing it
> with just lowpass on at first, and checking the resonance again.
>
> Cheers,
> Scott Deyo
> The Bridechamber
> contact@...
> http://www.bridechamber.com
> Jealous Edison Record Kompany
> http://www.jealousedison.com
>
>
> On Sep 14, 2008, at 11:11 PM, Dave wrote:
>
> > Hi all,
> >
> > I just finished building a cynare :) But am having problems with
> > the filter section. I am building a kit supplied by bridechamber
> > which has three separate SPDT switches for the filter types. I have
> > added the 6 pots for the osc and also added the impact gen mod to it
> > too (I subbed in a 100k pot for the 25k for now until I can get the
> > 25k pot). These mods seem to work correctly. I also changed the R
> > gain resistor to 1.5k instead of the 10k.
> >
> > I followed the CGS wiring diagram exactly assuming that the pot
> > shafts are facing away from me and CW is 3 (I am not sure about
this).
> > One strange thing I noticed with this is that the Decay and Damper
> > pots seem wired backwards so that as I turn it from 0 to 10 the decay
> > shortens for both, I would think it should lengthen the decay as you
> > turn the pot towards 10. The tone or balance between noise and
> > shimmer operates correctly.
> >
> > The problem with the filter is that the filter sweep is minimal
> > in effect, the envelope affects the impact sound strangely, when in
> > the middle (5) there is little to no impact sound and when at
either 0
> > or 10 the impact is back (sweeping the impact pot mod changes the
> > character of the impact sound). The resonance pot is also acting very
> > strange. I have wired the three switches as best I
> > knew how which is took the LP, BP, and HP and wired them to the
bottom
> > lugs of three switches then I wired some bus wire across the three
> > middle lugs of the switches and attached the common wire to that. I
> > don't know if that is correct but it makes sense to me. When I switch
> > between the filter types I can hear changes in tone that corresponds
> > to the filter type.
> >
> > Did I wire the three switches correctly, if not how should I do this?
> >
> > The main malfunction seems to come from the resonance pot. It does
> > not increase the resonance and when I turn it all sound going through
> > the filter is silenced for about 1-2 seconds and then comes back
again
> > with no change regardless of whether it is at 0 or 10.
> >
> > I'm new to the DIY so I don't want to mess with things too much
> > while trouble shooting, so I've gone over the board looking for
shorts
> > and poor connections but have not found anything yet, should I try
> > changing some of the wires around on the res pot or maybe the freq
> > pot? I'm confused as to why the decay and damper seem to operate
> > backwards from convention and am wondering if I got these wired
> > backwards maybe I wired the res or freq pots backwards but I've
> > checked over and over again and they match up to kens diagram...
> >
> > Sorry for the long post :) Any help would be greatly appreciated,
> >
> > Thanks,
> > Dave
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>