On Wed, 9 Nov 2011 14:45:13 -0800, DaveC wrote:

I was going to suggest that, since the mixer is going to be external
to the amp, he use a couple of wall-warts to get the dual supplies,
but I like your solution a lot better. :-)

Enough to suggest a nice circuit? ;-)

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Sure, a 555 charge pump.

Got LTspice yet?

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JF