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SMTR C&K E-Switch sub miniature slide switch, EG series, DPDT, http://spec_sheets.e-switch.com/specs/P040047.pdf E-Switch slide switch, right-angle, http://www.ckswitches.com/media/1422/js.pdf switch spdt single-pole double-throw spdt ON-ON K reed magnetic switch SPDT D rotary switch with 12 positions D 4 rotary switches with 3 positions D 4 rotary switches with 3 positions D 3 rotary switches are actually 2p6t, which means only six different step counts are available until the replacement arrives Wiring SW15 (once/stop) and cascade out is easier done via skywiring; only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the cylindrical part of a hex inverter, maybe for stability? 10-step.

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