The ultrasonic dog repeller works by emitting really strong, high frequency noise. You might think that this will destroy your ears, but this couldn’t be further from the truth. Human ears can only hear sounds within certain frequencies, and these devices are well beyond those levels. But the dogs, conversely, have a bigger span of frequencies of sounds that they can hear, as compared to humans. Which is why they will hear the high-pitched sounds and become very afraid, but you as a human won’t hear a thing. Trust us, when used in the right situation, the ultrasonic dog repeller can be a life saver.

Ultrasonic Dog Repellent device. It generates Ultrasound not audible to Human and repels Dogs.

There’s also an assumption that a canine will react strongly to extremely high sound frequencies, but there’s no ultrasonic dog repeller review to back this up. And just because a sound is high pitched doesn’t mean the animal will respond to it. Canines hear extremely high sound frequencies all the time, and can eventually become conditioned to them. It’s not how high the sound is, then, but how unusual and alarming it is. The best way to produce that effect is with a combination of sounds that a canine will perceive as new and possibly threatening.

Aggressive Ultrasonic Dog Repeller

Now you have an ultrasonic dog repeller to keep those barking dogs at bay. There are few proven methods for deterring dangerous animals, but a sonic dog repellent can be the solution that runners, walkers, bikers, and other outdoors people are looking for. Using sound to turn away animals isn’t a new idea. But, up until recently, people believed the best way to use sound was to crank up […]

Top 10 Ultrasonic Dog Repellers of 2017 | Best Reviews Guide

When it comes to a dog repellent, an audible sonic device is designed to be the most reliable and effective technology available. This approach to animal deterrence has only been around for a short time, but it is a vastly superior choice to ultrasonic and spray products. That’s because they activate in the animal’s sensitive […]

Ultrasonic Dog Chaser - Canine Repeller Creates a Safe Space

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 R3 at resonance frequency of the piezo transducer for maximum amplitude of the repeller ultrasonic sound. At 30 KHz this can reach a value of 108 Vpp. Without the piezo the output voltage is around 200 Vpp.
While some dogs moved away from the source of the sound, others seemed curious, while still others remained completely indifferent to the high-pitched sound. Therefore, while it appears most pest repellents fail to trouble dogs in an appreciable way, it is theoretically possible for ultrasonic devices to irritate dogs or make them uncomfortable.