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| A-1531 or A-557 | | R4, R12, R13 | 3 | A1M | **Potentiometer, 16 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | | | S3 | 1 | SW_SPDT | SPDT miniature toggle switch ON-ON Push button switch OFF-(ON) | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-2939 | | J1 | 1 | 10nF | Film capacitor | | | | S1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | | | | | | | | Tayda .

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