Ultrasonic Burglar Alarm: Transmitter and receiver parts of the circuit are connected each other by using a triple cable. System operates with 20V supply and 10V effective output voltage drives the ...
A new kind of burglar alarm, just patented last week, has already put a crimp in the burglar business. Developed by Samuel Bagno and manufactured by the Alertronic Corp. of Long Island City, the ...
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