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Back| B20k | Potentiometer | | | | | S3 | 1 | 1uF | Unpolarized capacitor | | | | S1 | 1 | B10k | Potentiometer | | | | | | | | | S3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14