A field test of a ultrasonic dog deterrent

K-II Enterprises Ultrasonic Dog Deterrent 5
Photo provided by Flickr
Note from TBO-TECH: Our number one question on this ultrasonic dog repeller is "Does it work?" Our response is "yes, it does." However, it is not guaranteed to turn away every dog. Your pet, or one who knows and trusts you, may not be repelled by the discomforting sound. Deaf, rabid, or especially ferocious dogs may not be affected by the sound.
K-II Enterprises Ultrasonic Dog Deterrent 5” x 2” x2”
Photo provided by Flickr
Any pet lover knows that dogs love the feel and of “squeaky” toys, but enduring the high-pitched repetition in the wee hours of the night can drive any pet-parent crazy! Ultrasonic HEAR DOGGY!® toys are made with a squeaker ONLY your dog can hear! Now you have an ultrasonic dog repeller to keep those barking dogs at bay.
Photo provided by FlickrTo add the 10 Best Ultrasonic Dog Repellers list to your website, copy this code:
Photo provided by Flickr( ultrasonic dog repellant, 'sounds' nice , but do any actually exist?)
Photo provided by Flickr
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.
Obviously, a training collar isn't an option if you don't own the dog. And sprays can backfire; it's hard to aim, the wind can blow the spray around, and dog owners get irate if they see you spraying an irritant into their pet's eyes. An ultrasonic dog deterrent works from a distance, it doesn't have to be precisely aimed, and it can be used in a more stealthy manner.Noisy and unruly dogs can make your life miserable. Even a friendly dog can be a nuisance if you are allergic and need to keep your distance. Training collars and deterrent sprays can help control problem dogs, but they aren't always a good option if the dog belongs to someone else. A high-frequency device is advertised to be a humane way to deal with your or someone else's dog, but do those ultrasonic dog deterrents work?The first thing to realize when using an ultrasonic dog deterrent is that, obviously, a deaf dog or an older dog with impaired hearing won't hear it. Also, the sound waves won't work through a solid object, so fences, walls, or windows will block the effect.