Long distance telephone ringing circuit

Published:2011/7/20 2:35:00 Author:zj | Keyword: Long distance, telephone ringing | From:SeekIC

When voltage ofringing circuit is more than 100 V , the two neon light H1 and H2 will be lighted.The output signal will add to VT1、VT2 after rectifiering by VD1~VD4.Then it will add to Optoelectronic coupler IC1,control theconduction of TRIAC.Thus the ac voltage can be added to the socket J, the load will access ac voltagethrough the plug.



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