I just realized I've been using the PN4391 too. But I don't think it
should make any difference.
I'm still confused....
Is this module supposed to function as a VCF> and< VCO or is it just
a VCF? Is the VCO only possible with added circuitry?
I'm confused because from Ken Stone's web site it sounds like you
should be able to use this module as a VCO.
This is an excerpt from the bi-n-tic page where he describes the
"excitation" rotary switch.
"Positions 2 to 5 of the rotary switch now provide four signals, one
octave apart, to "excite" the the filter when it is adjusted to be
near resonant, or if the filter is backed off, four octaves of square
wave VCO output."
Thanks!
-pete
www.casperelectronics.com
should make any difference.
I'm still confused....
Is this module supposed to function as a VCF> and< VCO or is it just
a VCF? Is the VCO only possible with added circuitry?
I'm confused because from Ken Stone's web site it sounds like you
should be able to use this module as a VCO.
This is an excerpt from the bi-n-tic page where he describes the
"excitation" rotary switch.
"Positions 2 to 5 of the rotary switch now provide four signals, one
octave apart, to "excite" the the filter when it is adjusted to be
near resonant, or if the filter is backed off, four octaves of square
wave VCO output."
Thanks!
-pete
www.casperelectronics.com
On Apr 5, 2007, at 3:01 PM, Scott Deyo wrote:
> I've been using the PN4391, not 2N4391. Sorry. Same pinout as the FET
> on the PCB.
> Didn't get to play w/ it last night...
>
> Scott Deyo
> The Bridechamber
> contact@...
> www.bridechamber.com
>
> On Apr 3, 2007, at 3:19 PM, casperelectronics wrote:
>
> > Hey scott,
> > Here are all of the part substitutions. I think these should all
> work
> > no prob.
> > LF356 > TL071s,
> > LM394>ssm2010 (Ray Wilson lists this as a good replacement for the
> > LM394)
> > 1Ktempco>standard 1K resistor
> > 1N4148>1N914
> > input "beads">10ohm resistors
> > I used a 2N4091 for my FET (which is what he says he uses in the
> > circuit description).
> > I checked all of the polarities, jumpers and other connections...no
> > prob. Before I wrote I noticed that my diode was in backwards. I was
> > excited thinking
> > that this must be the source of the problem,,,, I flipped it around
> > and their was absolutely no noticeable change in performance :(
> > How do you switch between filter and osc. when this is working
> > correctly?
> > -pete
> >
> > On Apr 3, 2007, at 9:14 AM, <contact@...>
> > <contact@...> wrote:
> >
> > > Any component substitutions?
> > > 99% of the time it's a polarity, wiring or trace problem, at least
> > > with me :)
> > >
> > > Cheers,
> > > Scott
> > >
> > > ----- Original Message -----
> > > From: casperelectronics
> > > To: cgs_synth@yahoogroups.com
> > > Sent: Tuesday, April 03, 2007 12:54 AM
> > > Subject: [cgs_synth] bi-n-tic filter...help!
> > >
> > > I just finished building the bi-n-tic filter and I don't seem
> to be
> > > getting any osc. output. The filter works great, bandwidth and
> > damper
> > > do what they are supposed to do but the frequency controls
> don't do
> > > anything. Anyone have much experience with this circuit?
> > >
> > > [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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