[sdiy] CV inputs with bipolar "amount" knobs

[BrightBoy]

The circuit is in the Op-Amp Cookbook by Walt Jung.

Cheers,

Jeff

-----Original Message-----
>From: Tom Wiltshire <tom at electricdruid.net>
>Sent: Jul 19, 2010 9:24 AM
>To: Synth DIY <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] CV inputs with bipolar "amount" knobs
>
>Hi All,
>
>I know various people have built various devices with CV inputs that have bipolar "amount" knobs so that you can easily invert a CV input - particularly useful for envelopes and such like.
>
>How many different ways of doing this are there? Can anyone provide a reference to a schematic online?
>
>I just had a big hunt around thinking I'd find loads, but mostly they must be parts of other circuits 'cos I couldn't find any.
>
>Any pointers appreciated.
>
>Thanks,
>Tom
>
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