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BackDev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the "aoKicad" and "Kosmo_panel" links on the Env output, its negative will appear on the other was worse. Images/IMG_6753.JPG Normal file Unescape D Rotary switch, 4-bit encoding, 16 positions, Real code K rotary bcd Complementary D Rotary switch, 4-bit encoding D Rotary switch, 4-bit encoding, 16 positions, Complementary code K rotary bcd Gray D 1x DIP Switch, Single Pole Single Throw (SPST) switch, small symbol D Push button switch, generic, two pins | | | | | | | R30 | 1 | 3_pin_Molex_header | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS)