Anti-toll-fraud circuit diagram

Published:2011/9/7 5:02:00 Author:Vicky | Keyword: Anti-toll-fraud circuit | From:SeekIC

Anti-toll-fraud circuit is shown in the above picture. The circuit in the picture is a anti-toll-fraud circuit which also performs collinear security feature. It is mainly made up of illegal parallel examine circuit, noise interference circuit, linear privacy-keeping circuit. The circuit is assembled between the telephone device and the exterior line. When there is toll-fraud, the circuit starts working and sends strong noise to the line, which makes the pulse or double audio frequency sent by the toll-fraud unable to be received. Meanwhile, the anti-toll-fraud indication light is lighted, and the host can track the caller.



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