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animal repeller

Atenuator

Jun 22, 2012
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I have a hand held dog repeller. Is it possible to amplify this signal? Can I say..., disconnect the piezo buzzer that produces the sound, and connect those wires into a small guitar amp and run that to some speakers?

Thanks for your help
 

Raven Luni

Oct 15, 2011
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Hahaha - I had thought about making a pocket device like that to secretly spook peoples dogs for a laugh. I dont think speakers would handle those frequencies very well. Youd have to look around for something more specialised.
 

donkey

Feb 26, 2011
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could you hook up multiple peizos and somehow amplify the signal over them all?
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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The repeller presumably uses an ultrasonic signal to repel dogs. Normal loudspeakers don't reproduce ultrasonic frequencies. Some tweeters have a bandwidth that extends into the ultrasonic range. If you want to make the signal louder, you obviously need a more powerful transducer, probably with a more powerful amplifier. First you need to find out the frequency range of the signal, then you need to find a suitable transducer (maybe a tweeter) whose bandwidth comfortably includes this frequency range, then you need to find a suitable amplifier. Find out the frequency range first, and if possible, capture a snapshot of the signal on an oscilloscope. It would be useful to know whether it's a sinewave or a squarewave (or something in between) because this affects the type of amplifier you need. If it's just a squarewave you can probably use an H-bridge driver, perhaps with some filtering to reduce the amount of harmonics that the tweeter won't reproduce.
Actually I remember giving the same advice in another thread.
Do a site search on "ultrasonic". You'll find lots of similar threads that may answer your questions.
 
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