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BackMm 3.5 mm jack 3 mm LED 5 mm Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm vertical board mount OR: | | | C7, C12, C13 | 3 pin Molex header 2.54 mm spacing D 3 pin Molex header 2.54 mm spacing | | | J5, J12, J13 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>