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TELEPHONE_VISUAL_RING_INDICATOR

2014-11-08 09:48  
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TELEPHONE_VISUAL_RING_INDICATOR
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