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Back- Current design uses six IDC 2×8 connectors with 4 positions D Switch, dual pole triple throw, 3 position switch, SP3T K switch SPST angled PTS645VL83-2 LFS C&K Button tactile switch https://www.ckswitches.com/media/1973/ksc7.pdf C&K Switches 1P1T SMD PTS125 Series 12mm Tact Switch with LCD screen K switch sp3t ON-ON-ON D Switch, single pole triple throw, 3 position switch, SP3T K switch normally-closed pushbutton push-button LCD D MEC 5E single pole double throw | | C12 | 1 | 1uF | Film capacitor | | | R31 | 1 | TL071 | Operational amplifier, DIP-8 | | | | | | R8, R10, R12 | 3 | 4.7k | Resistor | | Knobs | | | Tayda | A-4349 | | R6, R8 | 2 | 1N5817 | Schottky Barrier Rectifier Diode, DO-41"/>