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DEAN HAZELWANTER'S HT8950 PITCH SHIFTER (experiment) I built Dean Hazelwanter's Holtek HT8950 Pitch Shifter / Robot Voice / Vibrato from the build notes at General Guitar Gadgets. For fun, I used an optoisolator (VTL5C3) to control the 250K freq pot (P3). I connected the LED leads to the LED pads on the PCB, and the LDR leads to the pads for P3. Here's what it sounded like. . . ~
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charlie AT moosapotamus DOT net