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Back| R21, R22, R23 | 3 | 1k | Resistor | | | S1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>
| R21, R22, R23 | 3 | 1k | Resistor | | | S1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>