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ultra sonic transducers

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pete g:
totally agree with the advice given. will look into buying one. the only problem being, none of the commercial ones  have the range i need.

Zero999:

--- Quote from: pete g on April 21, 2024, 03:22:25 pm ---totally agree with the advice given. will look into buying one. the only problem being, none of the commercial ones  have the range i need.

--- End quote ---
Perhaps it's because you'll need an enormous amount of power, which might mean it's unsafe to be too near it?

Sound follows inverse square law, so to double the effective distance, you'll need four times the power.
https://personalpages.manchester.ac.uk/staff/richard.baker/BasicAcoustics/4_inverse_square_law.html

pete g:
yes, there could be a danger. but, being 87 i do need my sleep.

PlainName:
Perhaps an alternative solution would be to find something that encourages the dog to bark. Sooner or later it will get  hoarse, or the owners will be thoroughly pissed off with it (it is closer to them than you... inverse law...). Perhaps some clever control to start the encouragement the moment it stops barking and just wear the thing out.

Or... get a cockerel. Two might be better since they will be in competition, although that works best if you have hens too. But think of the eggs for breakfast!

SeanB:
Easiest is piezo tweeters, though you will need a few placed in an array, with a driver able to drive the 20uF or so of capacitive load they will present. Easy to assemble, and they do have a response out to around 30kHz, though your drive voltage is limited to around 30V or so. 7in by 3in ones are common for disco use, and cheap to buy for under $10.

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