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. . from EPFM (Electronic Projects for Musicians),
Anderton. I made the circuit board for this one by pasting
the component layout and solder tracings on opposite sides
of a piece
The internal trim pot that sets the carrier wave rejection is kind of touchy. Might have been better to mount it externally. If I listen carefully while not playing, I can hear the carrier oscillating very, very faintly.
Still, this is a great sounding ring modulator, with controls just like the very de$irable vintage Maestro Ring Modulator, plus an effects loop.