CV/audio mixer for modular idea

[List, Christopher]

I built something like this long ago and use it all the time, it's a _great_
utility module. I've got LEDs for both the + and - halves of the output, so
it works almost like a little o-scope!
Note that I wanted to be able to easily turn a cv all the way off, so I
didn't use  inverting / scaling inputs - because you never know if the pot
is right in the middle. I used an inverted output instead.

Check the rightmost module in this picture;

http://www.mindspring.com/~clist/synths/Spunky/closeup.html

- CList 

> -----Original Message-----
> From:	Jim Patchell [SMTP:patchell at teletrac.com]
> Sent:	Tuesday, April 27, 1999 4:04 PM
> To:	blacet at metro.net
> Cc:	analogue at hyperreal.org; synth-diy at mailhost.bpa.nl
> Subject:	Re: CV/audio mixer for modular idea
> 
>     It sounds useful.  Is it unique enough to be commercially viable?  It
> would be a great D.I.Y. project.  It would probably be a kit I would
> purchase, depending on price.
> 
>     -Jim
> 
> John Blacet wrote:
> 
> > Here is an idea for a CV or audio mixer for modular application and I
> > would appreciate any feedback!
> >
> > Serge seems to have the most amazing variety of these modules, while
> > Doepfer has very little....
> >
> > The mixer has two sections. The top section is 3 in, 1 out with +/-
> > control of each input (center off), so that the level and polarity (or
> > phase in the case of audio signals) can be controlled. A variable +/-5V
> > bias control is also present to add to the mix.
> >
> > This is all DC coupled, of course.
> >
> > The second section is a 1 in, 1 out version of the above.
> >
> > LEDs would be present on all inputs to show levels.
> >
> > I can see this in a 3U high by 1.5" W Blacet panel. Power supplies could
> > be in the +/-12 to +/-15V range.
> >
> > Whatdyathink?
> >
> > Regards.
> > -------------------------
> > John Blacet
> > Blacet Research Music Electronics
> > -------------------------
> > blacet at metro.net
> > http://metro.net/blacet/music.html