Emmanuel Galleto

user Test Engineer

city ISI

  • Dog Repellent Ultrasonic Circuit 2

  • Created: Apr 27, 2015

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When we hear the word “Ultrasonic" we often refer it to bats and dolphins communication. Technically, “Ultrasonic" applies to sound that is anything above the frequencies of audible sound, and includes anything over 20kHz. Frequencies used for medical diagnostic ultrasound scans extend to 10 MHz and beyond. This dog repellent ultrasonic circuit will chase away angry dogs. It comprises of a 555 timer IC, a speaker/piezoelectric and a little ferrite transformer.

The main part of this circuit is a 555 timer IC. A 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flip-flop element. Derivatives provide up to four timing circuits in one package. You can use the 555 effectively without understanding the function of each pin in detail. Frequently, the 555 is used in astable mode to generate a continuous series of pulses, but you can also use the 555 to make a one-shot or monostable circuit. The 555 can source or sink 200 mA of output current, and is capable of driving wide range of output devices.

To use this circuit adjust 4k7Ω Resistor at resonance frequency of the piezo transducer for maximum amplitude of the repeller ultrasonic sound. At 11 KHz to 22kHz this can reach a value of 10Vpp and the buzzer is a passive one (without generator).

Note: Ultrasonic frequency must be set with a dog nearby.


4k7Ω Resistor

10uF Capacitor

10nF Capacitor

1k2Ω Resistor

4k7Ω Potentiometer


NC Push Button

Check out another Dog Repellent Circuit.



    Can you give me a link to a piezo that will work with this circuit? I was using this one and got no response from my dog... Also, can this circuit be modified to work with 5 volts? I want to use it on a dog collar with a remote switch. Here's a link to the non working piezo :http://www.amazon.com/Terminals-Electronic-Continuous-Sound-Buzzer/dp/B00B0Q4KKO/ref=sr_1_9/186-1268517-0343031?ie=UTF8&qid=1454297040&sr=8-9&keywords=piezo

    Posted: Jan 31, 2016


    A rather poorly drawn schematic. Someone not intimately familiar with the 555 timer will have a hard time sorting out the operation of this circuit. V+ on top, ground on bottom, flow from left to right. Liberal use of ground symbols and V+ symbols to avoid so many wires crossing over and going around the circuit.

    Posted: Sep 14, 2017