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Back- Current design uses six IDC 2×8 connectors with 4 positions D 3 pin Molex connector KK254 Molex connector 2.54 mm spacing | | Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92