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A-553 | | | | Tayda | A-1157 or A-2425 | | U2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | J5, J12, J13 | 3 | A1M | **Potentiometer, 9 mm or 16 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR.

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