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Lamp, generic K switch normally-open pushbutton push-button Lamp D Push button switch, generic, two pins Operational amplifier, DIP-8 Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount | | R5, R29 | 3 | A1M | Potentiometer | | | | | | | | | | | Tayda | A-1531 or A-557 | | | | | J1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | | R8, R10, R12 | 3 | 1k | Resistor | | | | | | | | | | | S3 | 1 | LED | Light emitting diode | | Screws and spacers (see [build notes](build.md | | | | J2.

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