Telephone line burglar alarm circuit diagram

Published:2011/6/30 5:36:00 Author:Lucas | Keyword: Telephone line, burglar alarm | From:SeekIC

The breakover of T2 makes T3 breakover, and then the rear audio oscillation circuit, and LED, DY will emit aural and visual alarm, and it can add the interfere signal on out wire by LED, DY , while the voltage of out wire decreases, so those theft callers are forced to hang up as they can not dial. This alarm can monitor and prevent others from unauthorized using of your telephone line. When someone outside connects to your phone line and makes a free call, the alarm will issue the interference signals to forbid thieves from dialing, then it uses sound and light to inform of the owner somone having used the call.



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