Tv power photo observation circuit using LED

Published:2011/11/30 20:12:00 Author:May | Keyword: Tv power photo observation, LED | From:SeekIC

When switch places (2) , output voltage is the samewith theinput voltage. If voltage is normal (200~240V), two luminotrons are not bright. When voltage rises to 250V, point A 's potential rises to make red luminotrons birght, switch places (1) tomake output be 220V, red luminotrons go out again. When voltage drops to 190V, green luminotronsarebright, switch places (3).



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