Photo exposure timer circuit

Published:2011/8/4 3:24:00 Author:May | Keyword: Photo exposure timer | From:SeekIC

Working principle: The photo exposure timer circuit is composed of 555 monostable circuit, which uses manually start monostable circuit. When the power is turned on, the timer will be in the steady state. At this point the voltage of the timing capacitor CT: VCT = VCC = 6V. The two inputs are in high level to this 555 equivalent trigger, that is, VS = 0. KA does not pull in, and the relay is opened, then the exposed lighting HL does not shine. This circuit provides parameters with about 1 second to 2 minutes delay time, which can be adjusted by potentiometer RP. The relay in the circuit must choose the products with the pull-in current being more than 30mA.



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