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Back\*(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md | | | C3, C4, C5 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>
\*(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md | | | C3, C4, C5 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>