SynthModules

Thanks, Larry! (Says me, jumping onto Andrew's train. :-)

I also want this, although I'd like negative voltages, too. +/-5 or 10
volts. (Yet I always try to stay positive...) Is that just as simple?

Maybe the following spiral circuit will work. Note the 4-spiral ladder
design:
(Must view with monospaced font)

   o--^^^---||--<!--@----@-\
                     \-@----@-->|--~*&$%#!~--;-)


This should be on the synth DIY list, which was begging for on-topic stuff!
--
john



> --- Andrew Scheidler <xpandrew@ph.k12.in.us> wrote:
> > Yeah, this is something I've asked for on the Blacet list.  Seems like
> > it would be super easy to make a half-size module with 4 pots and 4
> > output jacks that could spit out 0-5 volts (or 0-10).
> >
> > Stepped voltage would be extremely useful as well.  Would it be any
> > easier/cheaper to have 4 on/off switches that would each turn on 1v, 2v,
> > 3v, etc and could be summed for a total of 10v.  That might be kind of
> > neat.
> > [snip]
> > I wish I had even basic electronics skills to make some of this
> > stuff :\
>

Larry Hendry wrote:
> No need to be just wishing.  The idea is to start with something
> simple is a good one.  What you are talking about it indeed something
> simple.
>
> Let's start with the most simple.  A control with a single output
> that is ranged from 0-10 volts.
>
> You could build a module with 4 of these circuits:
> Total parts:
> 4 pots, 4 knobs, 1 nice quad op amp (TL074), 12 resistors and 4
> capacitors.
>
> The most expensive part is the pots and knobs.  So, there is no need
> to try to cheapen it even furthur by leaving out the buffers.
>
> If you are interested, I can help.  You can lay it out on a $2
> protoboard from radio shack. total cost of the electronic parts about
> $2-$3 plus the pots and knobs.
>
> Larry H