want to make a thing that will let me create a tone from 20 to 50k
sort of an electronic dog whistle
dont know if any speaker exists that would go up that high
or what hardware can generate the signal
or what amplifier would amplify the signal w/ out rolling it off
anyone have any thoughts?
thanks
sort of an electronic dog whistle
dont know if any speaker exists that would go up that high
or what hardware can generate the signal
or what amplifier would amplify the signal w/ out rolling it off
anyone have any thoughts?
thanks
A friend and I build up a crude circuit like this. We used a 555 timer,with a pot to adjust the frequency range from roughly 15K-30K,then we fed that to a HOT from an old TV. We used one of the cheap rectangular Motorola piezo horns,and powered it all from a 9V battery.
Don't know about dogs,but it was enough to annoy his roommate.
Don't know about dogs,but it was enough to annoy his roommate.
I was thinking you'd make your own driver/horn combo. Piezo discs are used in ultrasonic humidifiers and the drive frequency is in the MHz. I'd start with a small disc and high natural resonant frequency.
Most of the piezo tweeters you're going to find have a paper cone glued to the disc, which is why they crap out at a certain point. I think so long as you have the current available you can get the actual element in them to go much higher.
Most of the piezo tweeters you're going to find have a paper cone glued to the disc, which is why they crap out at a certain point. I think so long as you have the current available you can get the actual element in them to go much higher.
Try an ultrasound cleaner
http://www.diyaudio.com/forums/multi-way/96465-piezo-tweeter-dogs-6.html#post1202147
The rest of the "nice" doggie thread is here -
http://www.diyaudio.com/forums/multi-way/96465-piezo-tweeter-dogs.html
Oatley Electronics
http://www.diyaudio.com/forums/multi-way/96465-piezo-tweeter-dogs-6.html#post1202147
The rest of the "nice" doggie thread is here -
http://www.diyaudio.com/forums/multi-way/96465-piezo-tweeter-dogs.html
Oatley Electronics
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