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Back| *(optional) SIP socket, 2.54 mm, 1x7 Pin socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | J3, J4, J5 | 3 pin Molex connector 2.54 mm spacing 3 pin Molex connector 2.54 mm 2x5 | | | R23, R24, R25, R27 Switch, triple pole double throw Precision Timers, 555 compatible, PDIP-8"/>