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To PSU PCB (will affect choice of 9 mm vertical board mount OR: **Potentiometer, 16 mm vertical board mount OR: | | 1 | 1uF | Film capacitor | | R3, R21 | 2 | 1N5817 | Schottky diode | | | Tayda | A-804 | | | C2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | Tayda | A-3588 | \** Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount OR: | | J1 | 1 | TL074 | Quad operational amplifier.

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