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xtrmi
Joined: 15 Jun 2008
Posts: 2
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 16 Jun 2008 7:25 where to buy a piezo that goes to 40KHz?? |
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| This may be a dumb question, but I can't find this. I live in the United states. I'm a first year computer engineer and I want to use this piezo in a dog repelling circuit that I'm building.
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pranam77
Joined: 22 Apr 2008
Posts: 80
Helped: 5
Location: The heaven
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| 16 Jun 2008 16:25 Re: where to buy a piezo that goes to 40KHz?? |
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| Buy it at any electronic component vendors. When u say "ultrasonic" it will surely resonalte to +/_ 40Khz. Make sure that it is not an ordinary speaker.
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Audioguru
Joined: 19 Jan 2008
Posts: 430
Helped: 30
Location: Canada
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| 16 Jun 2008 18:54 where to buy a piezo that goes to 40KHz?? |
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Dogs hear up to about 30kHz. Dogs do not hear 40kHz. The output of a 40kHz piezo transducer is very low at 30kHz because it has its max tuned output at 40kHz.
I saw a 25kHz piezo transducer that might work better.
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xtrmi
Joined: 15 Jun 2008
Posts: 2
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| 16 Jun 2008 19:41 Re: where to buy a piezo that goes to 40KHz?? |
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| Ok I found one with a horn that goes to 30KHz. I'll try that. Thanks for the help. I just moved and my neighbors dog likes to do his business in my yard not theirs. Its totally F'ed up. I'm hoping it will just avoid my yard when I get this device operating.
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kender
Joined: 19 Jun 2005
Posts: 931
Helped: 68
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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| 17 Jun 2008 23:55 where to buy a piezo that goes to 40KHz?? |
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Just curious: how many wats of ultrasount do you need to put out to repell a dog? Are you going to find this by experiment?
P.S. I'm not a big fan of dogs either.
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