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Switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | | | | R3, R21, R27, R28 | 3 | 22k | Resistor | | C12 | 2 | 1N5817 | Schottky diode | Tayda | A-553 | | | Knobs | | R25, R27, R29 | 3 | A1M .

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