Practical Telephone Detector(555,CD4017,CD4518)

Published:2011/9/8 1:33:00 Author:Sue | Keyword: Practical Telephone Detector | From:SeekIC

    The telephone detector which uses this circuit can accurately identify and remove the fault of the telephone ringing circuit, speaking circuit and dial-up circuit. It is very convenient. The figure (a) shows the power circuit, ringing and speaking detection circuit. The power is provided by 220v ac voltage through the voltage transformer T1 and is output in two groups. One group is 9v ac voltage which will output 5v direct current voltage to work as detection power after it is rectified by diode VD3-VD6, filtrated by capacitor C6,C7, voltage stablized by three-terminal voltage stablizing block IC2.



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