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Lib="ao_symbols" part="2N3904"> Small Signal NPN Transistor, TO-92 | | | | | U3 | 1 | Conn_01x10 | Pin header, 2.54 mm, 1x7 | | | C3, C4, C5 | 3 | 10k | Resistor | | | | | | J2 | 1 | TL071 | Operational amplifier, DIP-8 | | Screws and spacers (see [build notes](build.md | | | | J12 | 1 | SW_Push | Push button switch, generic, two pins | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-4349 | | Q1, Q2, Q3 | 3 .

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