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The timing capacitors. ** Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount OR: | | | Tayda | A-1624 or A-2969 | | | | R8, R10, R12 | 3 | 22k | Resistor | | | | | | | J3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 | | | | J4 | 1 | LED .

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