Telephone control automatic lighting circuit 2

Published:2011/4/25 4:37:00 Author:May | Keyword: Telephone control, automatic lighting | From:SeekIC

The diagram shows telephone automatic light composed of NE555 time base circuit and optical coupler. At night, when you need to make a telephone call, the light can lighten itself, it can delay 10~40s after on-hook, then the light can die out itself. Moreover, this circuit also set a triggering button. Ordinarily, when you need to lighten, the light can self lighten about 1min only by pressing the button.



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