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BackNormally-open pushbutton push-button D Push button switch | | R14, R15, R18 | 3 | 4.7k | Resistor | | R1, R2, R23, R24 R3, R21, R27, R28 | 4 README.md | 1 | LED | Light emitting diode, 5 mm Small Signal NPN Transistor, TO-92"/>