Odp: [sdiy] Call for opinions: Walsh Module

[Tim Ressel]

Harry,

I'm having trouble visualizing your idea. Could do a
sketch??

--TR

--- harrybissell <harrybissell at prodigy.net> wrote:
> How about one DAC, with a S/H demultiplexer (a la
> your favorite analog
> polysynths, ProV etc).  Then take an inverting
> opamp, and have the Walsh
> 
> output toggle two transmission gates (4016 ?).  You
> could do with just
> ONE
> voltage source if symmetry around 0V is not needed.
> 
> I call it 1/2 quad opamp, 1/2 quad transmission
> gate, two resistors...
> should
> come in under $1 for sure !
> 
> H^) harry
> 
> Roman wrote:
> 
> > How about common multiplying DACs?
> > Feed reference input with audio sugnal and you
> have
> > digitally controlled fader.
> >
> > R.
> >
> > ----- Original Message -----
> > From: Tim Ressel <madhun2001 at yahoo.com>
> > To: Seb Francis <seb at is-uk.com>
> > Cc: <synth-diy at dropmix.xs4all.nl>
> > Sent: Wednesday, September 11, 2002 12:49 AM
> > Subject: Re: [sdiy] Call for opinions: Walsh
> Module
> >
> > > Seb,
> > >
> > > Thanks, but I need digital potentiometers, not
> rotary
> > > encoders. Think programmable fader.
> > >
> > > --TR
> > >
> > > --- Seb Francis <seb at is-uk.com> wrote:
> > > > Tim Ressel wrote:
> > > >
> > > > > Ouch! I just looked at the prices of digital
> pots.
> > > > Oy!
> > > > >
> > > >
> > > > ALPS STEC16B 16mm rotary enoders 24 sine pulse
> per
> > > > revolution
> > > > CPC 87p each for 5+
> > > > (SW01640 / SW01641 / SW01642 / SW01643)
> > > >
> > > > Just get a PIC + Mux to read them and your
> away ...
> > > >
> > > > Seb
> > > >
> > > >
> > >
> > >
> > >
> __________________________________________________
> > > Yahoo! - We Remember
> > > 9-11: A tribute to the more than 3,000 lives
> lost
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> 


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