Light Control Cockcrow Ciruit

Published:2011/8/4 2:42:00 Author:May | Keyword: light control, cockcrow | From:SeekIC

The circuit working principle of this set is shown in the diagram. At night, when there is no light shining on the photoresistor RG, the essential resistance of RG is very large, (larger than 50K) , so LSE's pin ①, ② is equal to open, LSE's pin ④ outputs low level, triode VT1 is break over, relay J excitation actuation, its normal close point j is opened, analog cockcrow circuit IC KD5609has no power and does not work. When daybreak, there is light shine on RG, the essential resistance of RG changeslower ( <50k) , at this moment , LSE' pin ④ outputs high level, triode VT1 is closed, relay J is released, its normal close point j is closed, analog cockcrow circuit is electrified and worked, andit sends clearly crow from the indicator speaker BL.



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