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1x4 Pin header, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x2 (see [build notes](build.md)) | | | | J3 | 1 | B20k | Potentiometer | | R114 | 1 | SW_Push | Push button switch, generic, two pins | | | | | D 2 pin Molex connector 2.54 mm spacing D Switch, single pole double throw Precision Timers, 555 compatible.