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BackHttps://www.ckswitches.com/media/2779/pts636.pdf switch tactile SPST 1P1T straight NO SMTR C&K E-Switch sub miniature slide switch, OS series, SPDT, https://www.ckswitches.com/media/1428/os.pdf tactile switch SPST right angle, http://spec_sheets.e-switch.com/specs/P040170.pdf Switch, single pole double throw, separate symbols | | J1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | R21, R22, R23 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>