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R18, R26 | 3 | A1M | Potentiometer | | | | R31 | 1 uF | Polarized capacitor | | | | | R23, R24, R25, R27 | 4 | 100k | Resistor | | | C2 | 1 | 10nF | Ceramic capacitor | | | | | J1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational.

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