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BackLib="Transistor_BJT" part="2N3904" description="0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 KK254 Molex connector 2.54 mm spacing | Tayda | A-2939 | | | Screws and spacers (see [build notes](build.md)) | | R4, R6, R7, R30, R31 Switch, dual pole double throw, separate symbols