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Screaming Meanie sounds horrible. And, that's kind of the
There's a built-in oscillator that just makes a lot of
noise. The frequency (pitch) of the oscillator can either
be set with
the frequency control or, for even more fun, it can be
a CV pedal, as in the second clip in each pair of clips,
Project files corrected/updated Aug 2012:
PCB transfer (resize to 2.9"x0.9")
If you don't like hearing the oscillator squeal as soon as it is turned on, the 5K trim pot (TR1) can be adjusted to silence the oscillator at the minimum frequency (VR1). That way, if you plug in a CV pedal and leave it positioned all the way back, when you switch the oscillator on, it won't be audible untill you start rocking the CV pedal forward.
SW2 turns the oscillator on/off. In the schematic, it's shown as a SPST switch. But, I used a DPDT switch and included an LED to indicate when it's switched on.
Inside the enclosure, the circuit board sits on top of the pots. In this next photo, you can sort of see how I used some double-sided carpet tape on the backs of the pots, with only one side peeled off, to insulate the traces from shorting out.