Ringing phone light flasher


Posted on Feb 5, 2014

When the telephone rings the line voltage rises to 72 volts. At this time the LED in the opto-coupler glows and the transistor conducts. Due to this the transistor Q1 conducts. This makes the relay ON. The load connected to the relay whether bulb or bell turns ON.


Ringing phone light flasher
Click here to download the full size of the above Circuit.




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