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BackButton, h=13mm C&K PVA2 https://www.ckswitches.com/media/1343/pva.pdf tact sw push 6mm smd CK components KSC7 tactile switch SPST right angle, http://spec_sheets.e-switch.com/specs/P040170.pdf Switch, single pole double throw | | | | S3 | 1 | TL074 | Quad operational amplifier, DIP-14 A-1135 2 8 pin DIP socket | | R4, R6, R7 | 2 | 1N5817 | Schottky Barrier Rectifier Diode, DO-41