TELEPHONE_VISUAL_RING_INDICATOR

Published:2009/7/10 22:58:00 Author:May | From:SeekIC

This circuit will indicate the receipt of a call. When the telephone rings，a 100－ to 120－V ring signal breaks over NE1, and causes SCR1 to trigger. This causes LED1 to light until the SCR1 is turned off by depressing S1



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