[sdiy] polarity switcher

[patchell]

    For a voltage controlled polarity/gain adjust, I have been using
AD633's...however, this is one awful expensive way to do this (in singles,
they cost about $10).  You can also make a fairly decent four quadrant
multiplier out of a CA3280.  For a non voltage controlled aproach, you can
just use a pot, an opamp, and a few resistors to do this...dang if I can
remember where a good circuit diagram is.

markus wrote:

> would anyone like to recommend a variable polarity-switcher circuit to add
> to my modular? perhaps with voltage control ?
>
> tia
> mark

--
 -Jim
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