Cat and Dog Repellent Circuit Diagram
The electronic dog repellent circuit diagram below is a high output
ultrasonic transmitter which is primarily intended to act as a dog and
cat repellent. The ultrasonic dog repellant uses a standard 555 timer
IC1 set up as an oscillator using a single RC network to give a 40 kHz
square wave with equal mark/space ratio. This frequency is above the
hearing threshold for humans but is known to be irritating frequency for
dog and cats.
Since the maximum current that a
555 timer can supply is 200mA an
amplifier stage was required so a high-power H-bridge network was
devised, formed by 4 transistors TR1 to TR4. A second timer IC2 forms a
buffer amplifier that feeds one input of the H-bridge driver, with an
inverted waveform to that of IC1 output being fed to the opposite input
of the H-bridge which can be seen at A & B in an oscilloscope.
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