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BackPotentiometers, either 9 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm or 16 mm 3.5 mm jack 3 mm LED 5 mm LED 5 mm LED 5 mm LED 5 mm Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount | | | | | D3, D4, D5, D6, D7, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35"/>