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Https://www.thingiverse.com/thing:32122 //knurled_cyl( clf_partHeight, clf_handle_diameter, 2, 2, 2, true, 10 ); // the larger diameter of the knob is stopped by something mounted to the base of the board, cross at 90° to minimize capacitance between traces - .3mm for non-power lines, .6mm if carrying power MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules f80e4975fb checkpoint.

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