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R8, R10, R12 | 3 | 100R | Resistor | | C3, C4, C5 | 2 | 10k | Resistor | | U1 | 1 | B20k | Potentiometer | | Tayda | A-3588 | \** Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount | | R14 | 1 README.md | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | J3, J4.

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