The releasing interfere and preventing thief dozen circuit

Published:2011/6/30 3:19:00 Author:Fiona | Keyword: The releasing interfere, preventing thief dozen | From:SeekIC

The releasing interfere and preventing thief dozen circuit is shown as below,T,R is the phone into the line side,telephone is connected to the A, B-side.When the user uses the telephone,the burglar alarm does not work. When a theft or fight occurs, the line voltage reduces,transistor V1 is cut-off, base V2 obtains the high potential to be conducted,V3 is conducted too,so that there is output voltage on the stabilivolt VD3,the oscillator has electricity,the oscillator has electricity through the C6 input,the C6 output oscillation voltage to the telephone line,disturbs the pirates caller.



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