ELECTRONIC SWITCH FOR TIMED LOAD ENERGIZATION AFTER TRIGGER SIGNAL

A burglar deterrent having a timing switch connected to the lights of a room or building for actuating these lights for a selected period of time in response to a sound made by an intruder. The timing switch has an SCR connected to the switch terminals. The gate of the SCR is connected to a timing c...

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Bibliographic Details
Main Author STETTNER J,US
Format Patent
LanguageEnglish
Published 09.10.1973
Subjects
ALARM SYSTEMS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
ORDER TELEGRAPHS
PHYSICS
PULSE TECHNIQUE
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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Summary:A burglar deterrent having a timing switch connected to the lights of a room or building for actuating these lights for a selected period of time in response to a sound made by an intruder. The timing switch has an SCR connected to the switch terminals. The gate of the SCR is connected to a timing circuit which comprises a series connected capacitance and diode connected from the gate to the anode of the SCR. A second SCR has its main terminals connected across the capacitance for, at times, discharging the capacitance in response to a trigger signal at the gate of the second SCR. A zener diode is connected for limiting the charging voltage applied to the capacitance. A variable resistance is connected from the gate of the first SCR to its cathode to permit selection and control of the delay time.
Bibliography:Application Number: USD3764832