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BackQ2, Q3 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x7 Pin socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x2 (see [build notes](build.md | | R24, R26, R28 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>