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U1 | 1 | B20k | Potentiometer | | U2 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Small Signal NPN Transistor, TO-92 | | S2 | 1 | SW_SPDT | Switch, dual pole triple throw, 3 position switch, SP3T K switch normally-closed pushbutton push-button Side push button https://www.e-switch.com/system/asset/product_line/data_sheet/210/800U.pdf momentary / push-push button, h=23mm C&K PVA2 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=23mm C&K PVA1 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=17.5mm C&K.

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