Intruder deterrent apparatus and method

Details Intruder deterrent apparatus and method Intruder deterrent apparatus and method

1973-02-26

1978-07-25

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340148, 3403091, 362145, G08B 1322

Patent

active

041032942

ABSTRACT:
A burglar deterrent switch for installation in a conventional manual switch box for controlling room lights. An electronic sound responsive timing switch illuminates the room lights for a selected period of time in response to the occurrence of a sound and then turns the lights off for another selected period of time. The timing switch has a triac which is shunted across the manual light switch. The gate of the triac is controlled by an SCR connected in a bridge rectifier for controlling the triac gate current. The gate of the SCR is connected to the output of an amplifier and is switched on by sound incident upon a sound transducer connected to the input of the amplifier. A timing circuit means is also connected across the SCR and comprises a pair of voltage reference diodes connected parallel to a capacitance for fixing the voltage to which the capacitance may charge and having a resistance series connected to the parallel diodes and capacitance.

REFERENCES:
patent: 3049699 (1962-08-01), Larrick et al.
patent: 3459961 (1969-08-01), Ravas
patent: 3475751 (1969-10-01), Sontag et al.
patent: 3582671 (1971-06-01), Ott
patent: 3713126 (1973-01-01), Stettner

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