I am using the CGS board... so no 1-4 connection needed. I very well
may have burnt my cap though.
I found after lots of debugging that there was somehow a gap in one
of leads that I had missed and that 2/3 of my ICs weren't connected
to ground.
I powered the module up a bunch of times before realizing the mistake.
I'm not sure if that could have damaged something somehow.
may have burnt my cap though.
I found after lots of debugging that there was somehow a gap in one
of leads that I had missed and that 2/3 of my ICs weren't connected
to ground.
I powered the module up a bunch of times before realizing the mistake.
I'm not sure if that could have damaged something somehow.
On Dec 1, 2008, at 8:57 PM, Scott Deyo wrote:
> Did you connect pins 1 and 4 of the 311? There's a note on the PCB
> page, but if you're like me you may have missed it.
> This only applies to the Bridechamber version of the PCB, by the way.
>
> Neither of you burned out your polystyrene cap, did you? I've done
> that
> twice lately.
>
> Scott Deyo
> The Bridechamber
> contact@...
> http://www.bridechamber.com
> Jealous Edison Record Kompany
> http://www.jealousedison.com
>
> On Dec 1, 2008, at 12:44 PM, casperelectronics wrote:
>
> > Hey,
> > thanks for the response! I discovered a huge problem. Somehow one of
> > the traces on the board was cut and there was no ground
> connection to
> > the 4051s or the 4024. Connecting fixed a few issues but had no
> > noticeable effect on the VCO leak through problem.
> > I checked the outs of the 4024 and I'm getting 3 clean square waves.
> > One strange issue is that the VCO cuts off, just stops running at a
> > high frequency ALMOST out of the audible range.
> > When you turn it up to a certain point it cuts very noisy then just
> > cuts off.
> > Plus As I mentioned a bunch of times, I'm still getting strong bleed
> > through.
> > I've replaced every chip except the CA3140. I don't have a
> > replacement for that. Could that be responsible for my cutoff
> problem?
> > -pete
> >
> > On Dec 1, 2008, at 4:07 AM, andrewlistmayer wrote:
> >
> > > Mine isn`t working properly either, but based on what you said I`m
> > > 99.9999% sure your isn`t either. The VCO is supposed to clock the
> > > filter, so the frequency of the filter changes with it. When the
> > > filter receives no clock from the VCO, it seems to lock to a fixed
> > > frequency which is below the audible range. Mine did this before I
> > > fixed the VCO. The reason you get a filter sweep in the last
> 20% of
> > > the bandwidth knob is because you are simply increasing the band
> > large
> > > enough to let some audio through, while the center point still
> sits
> > in
> > > the sub audio range, so it`s acting like a normal lowpass
> filter. At
> > > least that`s how I interpreted it when my VCO wasn`t working.
> > >
> > > Now, the VCO leaking through into the audio without clocking the
> > > filter, that`s a new one to me. I`m no expert at this, so all I
> can
> > > say is that it`s clear your filter and VCO are working, so your
> > > problem mostly likely lies in the circuitry that is supposed to
> make
> > > them work together. The filter is clocked by 3 outputs of the
> 4024,
> > so
> > > I`d check around there. Good luck.
> > >
> > > --- In cgs_synth@yahoogroups.com, casperelectronics <pete@...>
> > wrote:
> > > >
> > > > Hello everyone.
> > > > Sorry to continue the Bi-N-Tic questions. I know there have
> been a
> > > > lot and I've read them all and I still have a few more.
> > > > I think I got the whole thing working right but I'm not sure,
> > it's a
> > > > weird module (as I'm sure you'll all agree)
> > > > The way it is working now it is really two modules, a filter
> and a
> > > > VCO, but I don't see (or hear) much connection between the two.
> > > >
> > > > If I turn the coarse and fine tune knobs all the way down, there
> > is
> > > > no oscillator.
> > > > Then if I feed a signal in the IN jack i can get some really
> nice
> > > > filter cut sweeps using the BANDWIDTH knob and resonance
> using the
> > > > DAMPER knob. The whole filter sweep is in the last 20% of
> turn of
> > > > the bandwidth knob.
> > > > As I turn UP the coarse tune, a square osc, mixes into the
> signal.
> > > > It doesn't effect the filter, it just mixes into the audio path.
> > > > When I turn it up almost beyond the audio range, the osc
> suddenly
> > > > cuts off.
> > > > Anyway.. maybe this is just how it works? I'd like to talk to
> > > > someone who has built one or two of these so that I know if I
> > should
> > > > work on it some more.
> > > > I really wish there was some kind of CV for filter cut. Am I
> > missing
> > > > something?
> > > > Thanks!!!!
> > > > -pete
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > On Nov 28, 2008, at 9:54 PM, casperelectronics wrote:
> > > >
> > > > > Hey Scott,
> > > > > I want to add the wave outputs on my bintic filter but I can't
> > > find
> > > > > the info.
> > > > > Do you sell daughter boards/ host schematics for that on your
> > > site??
> > > > > Thanks!
> > > > > -pete
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
>
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