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Microcomputer Telephone Cost-Saving Device Circuit Diagram

2014-11-08 01:23  
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Microcomputer Telephone Cost-Saving Device Circuit Diagram
The microcomputer telephone cost-saving device circuit is shown in the above picture. The circuit is made of anti-wiretapping and central processing. PIC16C56 is the central part of the whole circuit. Anti-wiretapping part is composed by VD5-VD8, A4, V4, V5 and HA. The operation of the device is very simple. It has no limitation on the business phones and the phones can be dialed directly; when making business calls, dial the general code first and then dial the telephone number. Then hang up the phone for 4S. The device automatically goes back to the state of limiting the non-business telephone.