Learn about dogs,
mans best friend. Find out what to feed
dogs as well as what dog
bowl to use and even how to adopt
a dog. Dogs make great pets so get yourself a dog.
DS0026 is a dual MOSFET Driver,
National Semiconductor (tied in parallel)
L1, is a 1:12 Autoformer Ferrite
Pot-core
Power MOSFET IRFZ44 Vcc
= 15 Volts Max.
Bypass with Ceramic caps: 0.47µF
& Tantalum Caps 25µF Use Ferrite Beads in Vcc leads
Keep all leads as SHORT as Possible!
Most parts can be found at DigiKey
Output Autoformer, L1 = 1 mH (Unwind the top layer of wire,
solder a tap, then rewind the layer.)
Piezo Horn Tweeter, 75Watts With Thermal Shutdown Protection
COMING in the
near future SDI KITs, & parts to be available at this
Web Site
Caution!!
Always use Hearing Protection when using/working
with this Device. Sound at Ultrasonic frequencies can cause PERMANENT DAMAGE
to your Hearing without your knowing it! --Huh?
Caution!!
Rational & Description
"If I entered the dog owners' home and disrupted
their "quality-of-life" equal to what they allow their dogs' intrusion
to do to mine--I would be promptly jailed!"
My SDI device(s) have worked for the most part
at reducing the neighbors' dog(s) from annoying the crap out of me; however,
there have been instances where it was more trouble than it was worth.
For the actual dog owners, it works much better
due to the proximity of the dog to the device: the quicker the response
the more effective. As you play with these things it becomes very clear
just how slow sound travels.
Three approaches:
1) A method of detecting (reco)
the bark, and squeaking back ~ 1/2 second of ultrasound (~20kHz @
> 75 W).
2) The second method is to record (realtime)
the actual bark in an analog CCD delay line (~100 msec FIFO) and upon recognition
that the sound is a bark, the device plays back--through a loudspeaker--that
last recorded 100 msec of bark. It really confuses them; they start shortening
the number of their barks, until they often give up. It is funny to watch/hear
their initial confusion!
3) The third approach works well on cold
winter nights when you can hear every dog in town, and so can your neighbors'
dogs! It is continuous white noise played through a loudspeaker, toward
the offending dog(s). This seems to "mask" the sounds that trigger the
dog's barking. Be careful however, because you could run afoul of your
local noise ordinance--especially
if your neighboring dog owner is "gunning" for you!
Questions/Answers
* What is the circuit driven with?
Is it an amplifier or stand-alone noise maker? --It is a "stand alone"
Powered Oscillator/Driver.
* What type of pot core and winding?
--Actually, I used several pot cores stacked, such that the primaries were
driven in parallel and the secondaries were connected in series--all phased
correctly. This was done as a quick & dirty way of achieving a "step
up" and allow for enough power--before core saturation. The specific pot
core specs are only important relative to optimum operating frequency:
~10 kHz to ~40 Khz, peaking at ~ 20 kHz. However, this is not critical
due to the broadband nature of ferrite transformers. One could use alternate
transformer technology: single large ferrite torrid.
* What is the freq range of the circuit (and a
dogs ultrasonic hearing range, for that matter)?
--I have typically used a frequency above the human range ~ 20 kHz. Dogs
seem to respond to almost any frequency up to 30 kHz (and maybe above).
My main intent was to not attract the owner's attention, but use enough
power & directivity to get the animal's attention!
..
Some Products we have found:
Hello,
Because
we have received numerous inquiries as to whether we could supply a SDI
device, this information is presented.
These
are Devices that friends have informed us of; however, I don't have firsthand
knowledge or experience with these devices.
We are
not in touch with the suppliers, and have no monetary involvement.
GOOD
LUCK to all of those/us that must be subjected to thoughtless Dog Owners
& their pests
pets!
