Frequently Asked Questions
how a spectral distribution would prove how annoying dogs
curious to see exactly what this anti-dog device (program) is of yours.
Any ideas you have are appreciated.
I could not agree with you more!!
If I entered the dog owners'
home and disrupted their "quality-of-life" equal to what
My SDI device(s) have
worked for the most part at reducing the neighbors dog(s) from
For the actual dog owners,
it works much better due to the proximity of the dog to the
2) the second method is
to record the actual bark in a analog CCD delay line (~100 msec
3) The third approach
works well on cold winter nights when you can hear every dog in
Re: how does the SDI work
Glen, Im interested in your SDI and how it works.. does it repel/aggravate
dogs from a long distance your web page doesn't explain it
Thanks for writing.
As you might guess, it depends on the dog, and what is provoking him at the time--it certainly stops random barking.
My experience has been for distances not exceeding ~75 feet.
The problem with long distances is excessive time delay between the bark and the "retribution."
For long distances, I have had success using a 18" parabolic reflector with a Radio Shack 2 1/2" piezo tweeter (75 Watts peak) at the focus. Of course, with this kind of directivity, you run the risk of missing the dog, if they have a wide roaming area: it is a tradeoff.
The health concerns can be ameliorated by placing the system up and away from close access by pets or people.
I hope this helps.
Re: Dog Problem
saw your circuit when I was web searching for solutions to my problem.
* What is the circuit
driven with? Is it an amplifier or stand-alone noisemaker? --It is
* What type of pot core
and winding? --Actually, I used several pot cores stacked, such that
* What is the freq range
of the circuit (and a dogs ultrasonic hearing range, for that matter)?
I hope this helps, let me know if you have other questions.
P.S. I would very much enjoy hearing your results...
Re: Dog Barking
I have a barking dog problem (not mine) and was wondering about the effectiveness of this design over a longer range. I'm thinking a the range can be extended using a barrel to focus the sound waves. Has this been attempted ? I'm assuming this circuit would be used in combination with a bark activated microphone to blast them. Any health concerns here other than if you blast yourself ?
Any additional info on the design & fabrication would be appreciated.
A parabolic reflector (~18") has been used to extend the range or to narrow the usonic sound coverage.
The health concerns can be ameliorated by placing the system up and away from close access.
The only possible problem may be--for long distances--excessive time delay between the bark and the "retribution."
My experience has been for distances not exceeding 50 feet.
I really don't have anymore info other than is on the page.
Re: HUSH PUPPY
Do you have direct experience to suggest the device works?
have ongoing dog problems surrounding my house, and would do just about
anything to stop
tried an array of 16 piezo tweeters, driven by a wide-band power amp from
What can you tell me about your success that I might have been missing?
The most important aspect of this type of system is: whenever the dog barks he should be immediately given a very loud BURST (~20 kHz) lasting ~ 1/2 second. My experience has been the quicker the response the more likely the dog will see it as a "punishment" meant for him.
If the animal is excited by something or someone, e.g., the garbage man, the less likely the system is to work. It is most effective when dogs are "just barking" for no apparent reason--which seems to be most of the time!
There is a second approach
which is very effective with MOST dogs: this is where the system records
(stores in a CCD delay line-- ~100 msec FIFO) all sounds while analyzing
these sounds for a BARK; when a bark is detected the stored/delayed sound
is switched to a P.A. amplifier (for the bark interval the recording mic
is muted) toward the dog.
In all cases, the limiting factor is the speed of sound, or the lack thereof; the farther away the dog, the longer the delay...
I hope this helps, let me know your progress.
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