ANALYSIS OF THE SIGNALS GENERATED IN A DESIGNED AND CONSTRUCTED MULTI-TONE ULTRASONIC RODENT REPELLER [ ]


A solar powered multi-tone ultrasonic rodent repeller was designed, constructed and characterized. The data generated during the simulation of the designed circuit using an oscilloscope of an Electronic Work Bench was investigated and analyzed. The plot of the data resulted to a rectangular pulses which confirms the use of 555 timer connected in astable multivibrator mode for generation of electrical signal, which is converted to ultrasound using a piezo crystal. The analysis of the pulses generated an ultrasonic frequency of 36 kHz which is used in repelling rodents. Also the Fourier analysis of the signal was computed and the intensity of the ultrasound was calculated, which infers that the intensity of the ultrasound is more on the rodents as it gets closer to the repeller. Therefore an ultrasonic frequency (which is frequency above 20 kHz) can be used to repel rodents.