[sdiy] Suitcase synth - analog switches

[Tim Parkhurst]

Hi Mike,

Off the top of my head, I don't' know any schematics for this but I'll look
around. I'd be surprised if somebody hadn't already done this. I don't think
it would be a very difficult circuit. I'm working on a schematic for this,
but it's going to be a while (at least until I revive the two dead Odysseys
and one dead Avatar I'm currently working on). Basically you would have a
4051 8-1 analog multiplexer driven by a 4029 Binary counter. Voltage
selection could be accomplished by using a very simple A/D converter instead
of the 4029 to drive the 4051. An 8-1 switch would take up a fair amount of
panel space, but a 4-1 might be worth it (just tie the 'C' select line on
the 4051 low so that only the first four I/O are active). If you want, I'll
pass on the schematic I come up with but like I said, it's going to take me
a little while. By the way, your sequencer design sounds really neat. I look
forward to hearing some sound samples.

Happy hacking!

Tim Servo

"Imagination is more important than knowledge." Albert Einstien
*****************************************************
> -----Original Message-----
> From: Electronium [mailto:mike at electronium.com]
> Sent: Wednesday, January 08, 2003 8:46 AM
> To: Tim Parkhurst; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Suitcase synth - analog switches
> 
> Hey Tim,
> Great idea!  Do you know of any example schems I can look at for something
> like this?
> 
> Something a little different than what you're talking about, but the
> current
> sequencer design incorporates a 2x1 switch that switches between channel A
> &
> B and creates a center channel (A/B).  When you have both channels set to
> a
> sequence of 8 steps, this creates a 16 step sequence on the 3rd channel,
> since it switches on the reset pulse of either of the two 4017 counters.
> But when you set the two sequences to anything other than equal lengths,
> you
> get all sorts of pseudo-random patterns.  Hopefully, I'll get the
> schematic
> sorted out & post it soon...
> 
> Best regards,
> Mike
> mike at electronium.com
> 
> Tim wrote:
> 
> 
> > Looks great! I love the simplicity of it. One of the few things I might
> add
> > would be some analog switches. Maybe a clocked 4 in - 1 out, kinda like
> a
> 4
> > position analog seq. Or perhaps even have voltage control of the
> selected
> > output. I remember getting a lot of use out of the analog switch on an
> ARP
> > 2600, and that was only a 2 in - 1 out.
> >
> > Tim Servo




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