Piezo Tweeter for Dogs

[Gold_xyz]

Hi people

I have necessity to build a kit similar to this
http://www.siliconchip.com.au/cms/A_101145/article.html
For the dog of my neighbor. (I cannot sleep anymore )

what type of piezo tweeter can I use?
which is it the maximum power that I can use?

I have to look for datasheet of the manufacturer..

[Geoff H]

That project used the Motorola CTS Bullet tweeter, KSN1005, which has been discontinued. It was rated at 94dB/watt (ref to 8 ohm) The KSN1038 was the replacement.

Regards,
Geoff.

[gychang]

Originally posted by Gold_xyz
Hi people

I have necessity to build a kit similar to this
http://www.siliconchip.com.au/cms/A_101145/article.html
For the dog of my neighbor. (I cannot sleep anymore )

what type of piezo tweeter can I use?

I have to look for datasheet of the manufacturer..

I have the same problem with the neighbor's dog.

The piezo looks similar to this for $1.44 /each. I used these for my DIY speaker recently and so far impressed.

http://www.partsexpress.com/pe/showd...number=270-011

gychang

[FastEddy]

I made something similar for the garden ... to keep the gophers away

It worked fine, the piezo driver sat on, aimed into a piece of 3/4" EMT electrical tubing, driven into the ground 6+ feet. By setting the frequencies a bit higher and making it simply oscilate instead of "warble" ... around 28K Htz., then it didn't bother the dog at all. The theory is that it messes with the gophers' sex life, somehow, so they go away. The ants all went away as well.

[Pano]

That's great is it drives away ants!

I could sure use one for m neighbor's yappy dog - all day long. Then I'll chase ants. Does the orginal use a warble tone?

[Graham Maynard]

This was built to put beside an open gateway to keep dogs out, and it is still wrongly labelled on this website.

http://www.zen22142.zen.co.uk/Circui.../insecrep.html

Don't get in line with the tweeter. You can't hear it but it feels very unpleasant.

[FastEddy]

No warble, just oscilation ..."... simply oscilate instead of "warble" ... around 28K Htz., then it didn't bother the dog at all. ..."

If freq of oscilation is high enough, dogs don't care ... just bugs and gophers.

[Graham Maynard]

Only there as an example !
Puts 24V square across the piezo without transformer.

I had one with three Motorola piezos and LM3900 warble driving a capacitor firing transistor npnp arrangement and step-up transformer (pcb about 1 x1 x2 inches) each but can't find the circuit I developed.
The beats were unbearable.

Was being designed as an airport bird scarer, one box could scare birds up to 1/2 mile.

Motorolas very directional at hf, thus if aimed into a neighbours garden will work over a very narrow range.

[FastEddy]

" ... Was being designed as an airport bird scarer, one box could scare birds up to 1/2 mile. ... Motorolas very directional at hf, thus if aimed into a neighbours garden will work over a very narrow range. ..."

Yes they are as are most higher freq. drivers. (If memory serves, something like 15 degrees off axis was max radiated pattern, narrower at higher freq.) = good for local doggie go go getter as it won't interfer too much with the whole neighborhood's other doggies.

Birds!! ... at airports !! I would have thought something more like a recording of the bigger hawks, played back would do it for the little birdies, pigeons, etc. ... and I would imaging you would have trouble with non-omnidirectionallity of the drivers as above = same as for doggies. (Is there a word like non-omnidirectionallity ? ... maybe it should be just "directionality" ...)

[Off topic a little: I have always wanted to record the Hooded Monk Finch ond some other Finch songs ... mostly way above human hearing range, 12K Htz. and up to above 25K Htz. ... digitally, then using some kind of frequency division technic to drop their tunes [play list?] down to a human listenable bandwidth without out losing content, etc. ... anyone every hear about doing anything like this?]

[Graham Maynard]

The bird scarer output was to be mechanically scanned through specified arcs.

Bird song.
There is already a device available for listening to bats in real time. It uses a special microphone plus a frequency changer to shift the frequency range down to audible.

Might be able to do a WebSearch for it.