First, the IC 567's in-built oscillator is developed to work within a incredibly large frequency spectrum, from under 1 Hz and as high as 500 kHz. An additional application of this ultrasonic generator/ receiver set can be in the form of a straightforward burglar alarm sensor. I need someone to make a ultrasonic dog barking machine. You possibly can listen to insects, bats communications, engines, etc. I looked this up recently and from what I found you need an oscillator which creates a frequency of 16-22khz (thanks wikipedia). The device we employed with the below explained circuits was a 33/4 -inch piezo tweeter which is available from most online stores. Transistors Q1 and Q2 boost the ultrasonic signals detected by the piezo speaker. Our very first circuit, is shown in the above Fig, is an ultrasonic generator which uses the well-known 555 IC timer in a adjustable frequency astable multivibrator circuit. Butler and Co Kit. The PLL (U1) stage in this concept is employed like a tunable heterodyne oscillator which additionally feeds the input of the JFET detector circuit. You can already buy these units at trash and treasure markets for about $15.00 to $25.00 The piezos are almost impossible to buy. $8.99 $ 8. I know there are some ultrasonic gizmos but they are awfully expensive. Hi Mr. Swagatom I am an electronic tech. Of course, he can use an electronic dog silencer or a dog whistle to warn his puppy that she needs to be quiet (such a common device lets out a high-frequency sound that only dogs can hear). Your email address will not be published. I know there are some ultrasonic gizmos but they are awfully expensive. i need to gift it to my fav chicken roadside eatery, pyper mentioned 555, this also appears 555 timer at Electronic dog repellent project http://electroschematics.com/1026/dog-repellent-circuit/ This link has 25 interesting posts and schematics + further links http://www.edaboard.com/thread10588.html, have a look at below link, I built this ultrasonic whistle to train my dog but I discovered it makes him go away with a look in his eyes as if he was telling me why to you want to heart me?, I stopped using it on him but I think it will drive other dogs as well away:http://www.geocities.com/tomzi.geo/whistle/whistle.htm, Answer I was thinking a piezo buzzer (or a few of them) would work as a speaker. How the dog responds to the high-frequency whistle depends on how you have trained them to respond. 11 years ago. Fences as Dog Repellents . It can be adjusted to different frequencies … Ortz Dog Whistle. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. As soon as the receiver detects the signal and the LED lights up, move the two Tx/Rx piezo away by a a minimum of ten feet and begin fine tuning yet again. Most piezo diaphragms fall off at this frequency. The discussed circuit is designed to discourage dogs from barking in the selected zone by the generation of a synchronized ultrasonic sound waves in response to a few initial barking of a particular dog. I have a neighbor who allows their dog to back early in the AM and all during the day, so I want a powerful ultrasonic device that when i turn it on it will make their dog howl at 3AM and wake them up, similar to when the fire engine goes by, so that they will get a taste of what they do to me. 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