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Back| J4 | 1 nF | Unpolarized capacitor | | Tayda | A-962 | | C7, C12 | 2 | 10k | Resistor | | | | | | | | | | | Tayda | A-001 | | R16, R18, R26 | 3 | A1M | **Potentiometer, 9 mm or 16 mm vertical board mount | | | | | U1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14"/>