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BackWith 3 positions D 2 pin Molex connector | | | | | L1 | 1 | SW_3PDT_x3 | Switch, single pole double throw | | Tayda | A-1157 or A-2425 | | | Tayda | A-1955 | | | | R16, R17, R19, R20 **Potentiometer, 9 mm vertical board mount. Only 16 mm vertical board mount | | | | 1 | TL071 | Operational amplifier, DIP-8 | | Q1, Q2, Q3 | 3 pin Molex connector 2.54 mm spacing