[sdiy] 4051 mux with caps and buffers?

Kyle Stephens lightburnx at yahoo.com
Mon Jul 2 22:56:20 CEST 2012


One mux/S&H application I've been wondering about is using this amateur radio demodulator circuit...:

http://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf

...as a phase splitter (with of course more than merely 180 degrees of shift). Might make a neat LFO utility.


_Kyle

--- On Mon, 7/2/12, Olivier Gillet <ol.gillet at gmail.com> wrote:

> From: Olivier Gillet <ol.gillet at gmail.com>
> Subject: Re: [sdiy] 4051 mux with caps and buffers?
> To: "Tom Wiltshire" <tom at electricdruid.net>
> Cc: "Robin Whittle" <rw at firstpr.com.au>, "Synth DIY" <Synth-diy at dropmix.xs4all.nl>
> Date: Monday, July 2, 2012, 2:00 AM
> Maybe the SMP08 from AD is the one
> you're looking for (pin for pin
> replacement of the SSM2300, used in the ESQ1 for CV
> distribution).
> 
> Olivier
> 
> On Mon, Jul 2, 2012 at 10:43 AM, Tom Wiltshire <tom at electricdruid.net>
> wrote:
> > You're probably thinking of the CEM/PD508:
> >
> >         http://www.synthtech.com/cem/pda508.pdf
> >
> > But Veronica's search gives you things you can get now
> that do the same job.
> >
> > Tom
> >
> >
> > On 2 Jul 2012, at 05:29, Robin Whittle wrote:
> >
> >> I recall in the past there was a 16 pin chip, with
> the same pin-out as a
> >> 4051 8-way multiplexer, except that it contained a
> capacitor for each
> >> mux output, followed by a buffer.  So it replaced
> a 4051, 8 capacitors
> >> and two quad op-amps.
> >>
> >> Can anyone recall what this chip was?  I hope it
> is still available.
> >>
> >>  - Robin
> >>
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