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BackOr A-3487\*\*\* | | | | S1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | R3, R21 | 2 | 10uF | Polarized capacitor | | S3 | 1 | B10k | Potentiometer | | | | | D1, D2, D3, D4, D5, D8, D9, D10 100V 0.15A standard switching diode, DO-35"/>