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| 2N3904 | Small Signal NPN Transistor, TO-92 Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | | R4, R12, R13 | 3 | 10 uF | Polarized capacitor | | R14 | 1 | SW_Push | Push button switch, generic, separate symbols, four pins D Push button switch, generic, two pins K switch single-pole double-throw.

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