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Back** Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | Tayda | A-1672 | | | Tayda | A-1955 | | Tayda | A-804 | | S3 | 1 | 10nF | Ceramic capacitor | Tayda | A-3545, A-3489, or A-3499\*\*\* | | | R4, R6, R7 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 KK254 Molex header Operational amplifier, DIP-8 | | D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35"/>