High Power Ultrasonic Transducer for Painfield Genorator
Fucian
thing that produces pain from ultasonic sound?
Matt
Watson A.Name
Ultrasonic sound doesn't produce pain. You've been reading too many
SciFi books.
The "painfield generator" is a group of tweeters with an oscillator and
amplifier driving them.
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Fucian
front.I have a book with instructions called "Build your own laser phasor and
other space age products" I just want to know where to get the transducer and
does it have to be any special kind.ie-will a 20-40khz 110db ultrasonic
transducer suffice?
Matt
Sir Charles W. Shults III
have found were medical supply houses or surplus stores. This is the sort
of item you often have to look around for. But I have used plain vanilla
Radio Shack tweeters with pretty fair results.
Try the Thomas Register online if you are willing to pay full price for
a real ultrasound transducer.
Cheers!
Chip Shults
SPAM free Email - aic...@gdi.udu.net but remove the .baryon
Fucian
a D40D5 power transistor.None of my catalogs have it.Cant i use a simple
2n3055?
Matt
Watson A.Name
Yeah, I finally found the copy I had stashed away. Which one are you
talking about? IPG5 or which? In any case, it says that it doesn't
always work on humans. And they don't recommend it be used on anyone.
Sounds like it's for repelling aggressive dogs.
I looked thru the schematics and couldn't find any info on the piezo
transducers. I think they're tweeters because they aren't really
ultrasonic, which is even higher frequency. These are working around 16
to 20 kHz, which is the upper range of hearing.
Watson A.Name
The D40D5 is a transistor made by GE and comes in a plastic case. It's
similar to the TI TIP31 and the substitute is ECG/NTE 210. It has a
Vceo of 45 volts, a power dissipation of 6 watts, and can handle 1 amp
collector current. The only catch is it's relatively high gain, about
200, whereas the TIP31 is only about 40 or 50. So it may take more base
current. But that doesn't look like it would be a problem in these
projects.
Aubrey McIntosh
"Watson A.Name" <NOS...@postoffice.pacbell.net> wrote in message
news:3B2D81EB...@postoffice.pacbell.net...
>
> Yeah, I finally found the copy I had stashed away. Which one are you
> talking about? IPG5 or which? In any case, it says that it doesn't
> always work on humans. And they don't recommend it be used on anyone.
> Sounds like it's for repelling aggressive dogs.
>
b@o@u@t@@i@t@@@@@
Lizard Blizard
>
> Has anyone used them on roaches?
I was checking out the FTC web site recently and I read a piece on
electronic pest repellers. Seems that the FTC is requiring the
makers/sellers to advertise using results that are verifiable and
accurate. I would guess that this is because they have received
complaints about these devices, mainly that they don't work, and that
the advertising makes them sound like they work wonders.
I know that the one that someone gave me was a couple cheap tweeters and
a 555 oscillator, with a wall wart power supply. I took it apart and
found that roaches had been living inside, like it was their home. So I
don't believe they work worth a damn.
BTW, the one I took apart was named "Panasony"! Talk about a rip-off!
Do a web search for the word "Pesticator" amd see what you come up
with. If they're still in business, that is.
[snip]
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Spehro Pefhany
> BTW, the one I took apart was named "Panasony"! Talk about a rip-off!
There used to be a Taiwan based company that called themselves "Tobishi",
using the same script font that Toshiba used. I've also seen a slight
variation on "National", a brand that Matsushita (Panasonic) has very much
established in Asia for small appliances etc. Again, using the same heavy
font and red colo[u]r.
Best regards,
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Fucian
Im told it works on people.One person I spoke with said it was the most
annoying black box youll ever see!
Matt
Branko Badrljica
20+ kHz more-or-less-sine generator
plus simple amplifier, possibly all done with one IC...
Regards,
Branko
"Fucian" <fuc...@aol.com> wrote in message
news:20010618164516...@ng-cb1.aol.com...
Fucian
Any reccomended ICs?
Matt
Branko Badrljica
small.
Take a look at its frquency response curve and use the freq. that has
decently low losses and lies
as high as possible (just before curve drops at high freq. end).
It would be nice to have sinewave with lowish THD on the tweeter in order to
have as much energy on the one
frequency and not at higher harmonics, where tweeter can not reach...
Something from TDA series comes to mind, like 7294 (100W) or maybe some
smaller brother DTA729x.
Since this is essentialy power opamp, it should be easy to convince it to
oscillate at desired frequency and amplitude.
I have made several projects with it and they work 100%, but as an
amplifiers, not oscillators ;o).
Still, a few capacitors and resistors added should get you there.
I have made one 75W mono and one 2x 200W stereo with them. I have forgot if
I managed to translate articles in english, but
schematics and PCB files should get you through. I have used Tango for it,
but can send you also stuff in PS, EPS or PDF,
if you need it.
There is safe fallback option here. If you can't make it to oscillate, you
can still get bass speaker, connect everything to PC's CD audio output and
play some nice stuff from Metallica at the full volume ;o). I say safe
because stuff never got me a headache, but a pure sine above 25 kHz at
decent power most surely would...
Regards,
Branko
"Fucian" <fuc...@aol.com> wrote in message
news:20010618213832...@ng-co1.aol.com...
Lizard Blizard
Fucian wrote:
> Matt
Last week the fire alarm company came in and tested our smoke alarms.
Our bldg has these 'annunciators' on the walls, with a strobe flash and
a screecher in them. Last week they went off and they drove us out of
the bldg. I think they might be related to the BEEP-BEEP! backup
noisemakers that comm'l verhicles have to have, which are like a
Sonalert, I think. In any case, these screechers are loud and
modulated, probably at 60 Hz.
I don't see how a high freq tone could annoy anyone, since most people
can't hear that high anyway. And if you get it too loud, someone may
complain of ear damage.
Fucian
vibrates at the frequency of the transducer.It will not work without the metal
screen.At least this is what the book says.The book names the transducer as
Piezo driver #1023.
All the circuit is is a 555 pulsing a transistor and the transistor is hooked
to the piezo through an inductor.The peizo uses a sine wave.
Matt
Branko Badrljica
uncomfortable.
From that litle personal experience I can say that it feels like bad
headache and nausea. Your head feels like it's
going to burst and maybe even hear some white noise in the background.
At low levels it's irritatingly close to the feel that I have when I'm verry
worried, depressed etc. I suuppose one could
have nervous breakdown or at least trigger it with this stuff not even
knowing the real cause. (I'm talking here several tens of kHz, not Mhz for
which effects I have no idea...).
Feeling is discernible from more natural causes, but who would suspect at
every headache that high volume ultrasound exposure might be the cause ?
Regards,
Branko
"Fucian" <fuc...@aol.com> wrote in message
news:20010619113304...@ng-cp1.aol.com...
Lizard Blizard
Apparently the inductor is supposed to tune the transducer to be like a
series tuned circuit that passes mainly one band of freqs and rejects
the rest. This helps make the square wave output of the 555 look more
like a sine wave.
The book, IMHO is a come-on to buy his kits. He gives you a project,
but there's no way to complete it without getting the most important
parts from the company.
Fucian
there.But since i have heard positive stuff about it from several people, it
must work.They didnt use his kit.I was just wondering(since I dont know a thing
about ultasonic sound) if there are certain types of transducers.In a catalog I
see one and its about 110db and 20-40khtz.Its 5.50$.I guess ill look into that.
Matt
Aubrey McIntosh
site, she saw a pest, and said that we had to find it and plug it in, that
the roaches were coming back. I pulled a new piece of furniture away
from the wall and showed her that it was plugged in all along. She
was pretty disappointed in this.
My question was more to the point of the "painfield generator" which
I assume has more power / energy.
"Lizard Blizard" <nos...@private.rsccd.org> wrote in message
news:3B2E0E2D...@private.rsccd.org...
Fucian
it tunable to max on the target.I dont know about roaches but, on people and
animals it seems to drive crazy.
Matt