Telephone hands-free circuit

Published:2011/7/9 0:23:00 Author:Fiona | Keyword: hands-free | From:SeekIC

Telephone hands-free circuit is shown as above, this picture is HA22 (VI) P/TD type telephone hands-free circuit produced by jiangsu.When the telephone is in h-f state,the receiver is replaced by speaker; The microphone is replaced by sound power converter(the pickup) BM. hands-free circuit is composed of IC1, IC2 six transistor (9013) and so on. When the switch CH5 and CH6 are linked together,hands-free indicator VD7 is bright, the telephone enters into the h-f state, when CH5,CH4 are linked together or off-hook, the hands-free circuit is closed.



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