OT: Barking Dog Problem

Wonder what the police will think when everyone on your block is bleeding out the nose.

Sno-o-o-ort >:-} ...Jim Thompson

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| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

You don't run it continuously.

Now we're talking! Use the piezo's as a microphone array. IF bark THEN copy phase relationship; engage amplifiers.

That should smack the dog right on the middle of his head. :)

joe

Where are the hearing aids with anti-sound silencer?

joe

We had a pair of Siamese who would go out together and round up some happless pooch and bail it up in a corner and then sit there enjoying it's discomfort or terror.

I am *very* skeptical about the "50 watt RMS" claim on these. I couldn't find any manufacturer's info, the tweeters come from China, and the only sellers were on Ebay.

Also, I didn't see any claim about frequency response, even in the audio range, let alone ultrasonics. (Some piezos that I've used do have reasonable output above 20 kHz, but with wild dips and peaks.)

This looks to me like just another inflated audio spec, especially given that the tweeters look like they could handle a few watts at most, before going up in smoke.

If there is any validity to the "50 watt" spec, it is probably from the fairly common approach of advertising the power of the amp that drives the whole audio range. In such a case for "normal" music, etc, almost all of the power is going to be used by the woofer. If you set the crossover frequency high enough, the audio power to be handled by the tweeter is pretty small.

Just my $0.02 worth...

Bob Masta DAQARTA v9.00 Data AcQuisition And Real-Time Analysis

Scope, Spectrum, Spectrogram, Sound Level Meter Frequency Counter, Pitch Track, Pitch-to-MIDI FREE 8-channel Signal Generator, DaqMusiq generator Science with your sound card!

Just for drill , I searched on the internet and found some sellers that were not on Ebay, but not a link to the manufacturer.

But I did find a post by someone that said using them with a signal generator did not work to change dogs behaviour.

Dan

>

Of course it won't work. That's why I need to build an ultrasonic power amp. Most 'signal generators' only put out a few milliwatts. For instance: The HP 651 A/B only put out three volts RMS into a 50 Ohm load. Piezo tweeters are a capacitive load at around 1K ohm. How efficient will a common audio grade function generator be, with that

20:1 or worse mismatch?

With Option 002 (HV Output), the HP3325 A/B will put out 40 volts P-P, at up to 40 mA. Even with a 40 V P-P output, that still isn't enough drive for any decent output. I have seen these speakers connected across the primary of a singe ended tube amp, with just a capacitor to block the DC voltage. They do not require a crossover, and you can connect them in parallel, or series parallel for larger arrays. A 50 ohm resistor in series with each speaker is recommended, to limit current if you go too far above the rated frequency.

These are the speakers I bought, but the OEM doesn't give any specs.

Their catlog is here:

They are 3.5" * 3.5", 30W and for use across a four to eight ohm speaker according to the OEM catalog. They are rated 5 to 20 KHz. The specs look like they were written by someone without a clue. When I have the time, I will connect one across my HP3325A, and another to a scope to check the frequency response, and to find any peaks or dips.

I saw several people attempted to use an old stereo amp, but most will go up in smoke before they will provide a usable ultrasonic output.

Why would an ultrasonic sound impress a dog? If you want to stop a dog from barking set off a stick of dynamite or drop a car from a couple of stories up. They respond more to sounds that indicate a large size is generating them. The higher the pitch, the smaller the source sounds. They will think your tweeters are a bunch of baby birds.

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Rick

A colleague here at the UW build an array of 30-watt tweeters to aim at the neighbor barking dog.

Immediately he half-destroyed his hearing on one side. Permanent tinnitus. Never even finished the device.

Once I was working with a PZT disk transducer from a welder. Few watts input, 40KHz. After about ten minutes I had squealing tinnitus in both ears. It took about an hour for it to go away again. Enclosed the xducer in a sealed mayonnaise jar.

You should pray nightly to never receive an internal RF burn ...or any ultrasound hearing damage.

erator did not work to change dogs behaviour.

The post mentioned what he was using to drive the speakers. But I did not check to see exactly what kind of a device it was. I said " signal generat or " because it obviously generated a signal , but I do not think it was a lab signal generator. Now I can not find the post.

Dan

1: It will be mounted outdoors. I will be inside. 2: It will be pulsed, not CW. The pulse will be the same length as the bark, or even shorter. 3: I already have long term tinnitus. 4: I have worked with 195 KW of UHF RF. 5: I doubt that dogs can hear 40 KHz. The transducers I have are rated to around 20 KHz. I've seen dogs go nuts from the squeal of the horizontal sweep of NTSC TVs at 15,734.34 Hz, when a yoke was singing.

By "go nuts" you most likely mean start barking like they are mad? Seems counter productive.

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Rick

There is always resulting to "SDI"

I like playing back the bark with the 100 mS delay.

But I think Jim should just adopt the dog. Its obvious the neighbor does no t love his/her animal or they would fix the barking issue as best they can. Either that or the dog rules the humans. Dogs bark when they are lonel y, have anxiety, or just to find the location of other dogs.

My bet is Jim could give it a better home...

Note on the SDI website is a link to a professional ultrasonic system, know n to work, and 229$ is not that much, compared to the R&D effort.

Steve

My dogs and cat slept under the covers at my feet ;-)

I'll check out that link, Thanks, Steve! ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

As I read further into this, "pros" use super-soaker squirt guns or water sprinklers and a cueing/reward system.

Barking gets excessive, command is given to :Shush: If command fails, porch light comes on or a clicker is used as a cue. If barking continues, water commences. Once water silences the dog, reward dog for quiet, repeat for offending.

Commercial systems are sold for this for Kennels, and evidently it works. Although my late Border Collie (too smart) would have tripped this thing just to cool off in the summer.

Steve

Set up old slightly more directional bass speakers pointed at the dog AND his owner's house. Each bark results in low frequency pulsations that border on window shattering. The dog's ears will not like irt, The dog's owner will not like it, and eventually will get the message conditioned into him like a pavlovian march tune. Let *him* figure out how to shut the dog the f*ck up. Until then, the bass beatings will continue...

Why would that accomplish anything. Likely the dog would think there is an echo or another dog, neither will make him want to quit barking.

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Rick