OT: Barking Dog Problem

I simply left a note asking my neighbor to come talk to me about the barking dog and got yelled at when he came home. I called animal control which is handled by the sheriffs at that location. Seems the officer responsible for that duty is an animal lover and told me, "of course the animal barks". I gave up.

I was being woken up every morning by the dog barking when the owner left and put the dog in the back yard for the day. I don't know if the animal barked just at the time he was put out or if something disturbed him. But it lasted long enough to wake me up and that is not an easy thing to do before my 8 hours are up. So the dog was barking for some

10 minutes at least. I don't get why this didn't bother everyone in the townhouse cluster.

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Rick

Like this? 20 @ 50W each would allow 1 kW of ultrasonics. :)

Phased array. Think of the gain that could be had.

Holy shit! That oughta to do it >:-} ...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.

I bought a better deal awhile back. I got 50 of them for $39,95, delivered. Now I just need to finish designing that 2500W ultrasonic amp. I'll feed it from my HP3325A function generator, and set to sweep through the range that dogs can hear. I will use a bark detector to trigger it. On bark = one sweep, then switch it off.

Add some PVC pipe to sharpen the array, and dogs will hear it for ten miles. ;-)

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.

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!

22 LR thru the left ear generally works. Sorry but I digress. High powered high frequency audio comes to mind. Gets rid of rats too, sometimes.

28KHz-60W-Watt-Ultrasonic-Cleane-Transducer-Power-Drive-Module-110V-

All Chinese specs are wildly exaggerated in my experience however they do offer some good deals on electronics if you're careful in your buying expectations.

Anyhow I once DID build an ultrasonic device with 70 watt rated Pioneer piezo speaker and measured the drive current at 12 volts at 9 amps for short bursts of digitally generated dual swept sine waves.

In the audio spectrum it stunned in unimaginable disorientation, the ultrasonic being a dog lover I never did test out. However Pioneer 30 years ago seemed respectable in their claims.

Now I never thought to trigger on bark. Negative reenforcement, I like.

Forget 555's, go for 4093 schmitt trigger oscillators driving dual swept sine waves from a johnson count 4017 IIRC with resistors tailored for sine wave generation at 1/10 the 4093 drive easily cleaned up with low pass driven hard with whatever you like. I've used FET and bipolar.

See later post about trigger on bark, not mine.

Why is that negative reinforcement and not positive?

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Rick

Negative is when you want an animal (person) to stop doing something. Positive is when you want them to do something.

If you wanted to teach the dog to bark at something, you give them a treet when they bark at the correct thing. That would be the positive .

I know what positive and negative reinforcement are.

"Negative reinforcement occurs when the rate of a behavior increases because an aversive event or stimulus is removed or prevented from happening."

"Positive reinforcement occurs when a desirable event or stimulus is presented as a consequence of a behavior and the behavior increases."

I'm asking you how you know just how the dog will perceive the noise. What makes you think the noise won't make the animal bark *more*? Haven't you ever heard one dog start barking in response to another dog bark?

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Rick