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Back| *(optional) SIP socket, 2.54 mm, 1x4 | | | | | | | | | | | R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7, R30, R31 Switch, dual pole double throw | | | D3, D4, D5, D6, D7, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35"/>