Coupled with photoelectric isolation AC load control circuit

Published:2011/6/4 8:33:00 Author:John | Keyword: AC | From:SeekIC

Microprocessor’s decoder output feedback to trigger 7476JK. And the trigger JK goes to trigger triac through the optocoupler. Therefore, the on / off control of a lamp or other AC load can be achieved. The optocoupler formed by an LED and a CdS photocell is placed within the hood. When the light emitted by LED shines on the photocell, the photocell's resistance decreases. So it will have a control voltage with proper size and direction to trigger the control pole of SCR. The SCR is conducted.



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