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Back\*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | J1 | 1 | 10R | Resistor | | J4 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x4 | | | | | Tayda | A-826 | | | | Tayda | A-1605 | | | | | | | | J1 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x4 Light emitting diode | | | | R20, R22 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92