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*(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | R4, R12, R13 | 3 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x10 Pin header, 2.54 mm, 1x4 Light emitting diode, 5 mm Small Signal NPN Transistor, TO-92 | | | | | | | | U3 | 1 | 2_pin_Molex_connector | KK254 Molex connector 2.54 mm spacing | Tayda | A-2939 | | | | | | J1 | 1 | 10nF | Film capacitor | | | | | | S2 | 1 | SW_Push | Push button switch | | | | Tayda | A-4349 | | | Tayda | A-3545, A-3489, or A-3499\*\*\* | | | | | | R2, R5 | 2 | 1M | Resistor | .

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