[sdiy] Xfade

[Steve Lenham]

> I'm having a hard time finding crossfader schematics. Anyone out there
> have any schematics or resource suggestions?
> I want a true RMS crossfade with a -3dB midpoint.I will be fading
> between two synth level signals (around 10V pk-pk).
> The catch is that I would like to achieve this without using a dual
> ganged pot and without making the circuit overly complicated (like
> basing it on two VCAs). I have a feeling these two requirements may be
> mutually exclusive.
> Any ideas??
> Thanks!
> -Pete

If you can relax the "no to two VCAs" requirement, then THAT Corp's 
Design Note 120 has what you need:

http://www.thatcorp.com/datashts/dn120.pdf

(they call it "pan pot" rather than "crossfade")

HTH,

Steve L.