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Description:
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 ultrasonic transducer at its highest value.
Transmitter circuit gives the maximum gain at 40kHz.
Ultrasonic
transducers in the circuit must be placed vis-à-vis and when a barrier
passes between them it must block the connection without affected from
reflections.
Transmitter is continuously operating and generating
40kHz ultrasonic oscillations. Receiver is designed to operate only when
no ultrasonic signal reaches it and it produces an output signal. You
can connect an alarm system with a relay to the output of the receiver.
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