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BackSwitch, normally closed, generic, four pins D Momentary Switch, dual pole double throw, separate symbols | | R16, R18, R26 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | Screws and spacers (see [build notes](build.md)) | | | | R5 | 2 pin Molex header 2.54 mm spacing"/>