diy dog repellent
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Here is a whistle schematic
with one of these
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for a dog that barks and barks
just time a same time frame as it barks
so the noise replys
in lenghts
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deter a barking dog
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use this to give adjustments and as a driver
if you need a realy powerfull one
then you can try one of the design on elektroda for amplifiers
although chips have a certain responce this circuit is good to 1mhz
so will be fine for lf
as outputs what to do is use transducers you can get 2 or 5 watt versions that cover 1-100khz so this is fine
then if you need a directional amp
you can use some pipe {copper } ask robin hood for a device for listening {its on the board somewhere ago} and use the same technique in reverse
a resonator you can add fins to it to increase the overtones
makign a stack of pipes like a dog deterant organ
even play them barry manilo remodulated with a self adjusting linear bandblock up converter chip
you can buy these turns a deep voice into a very high pitch one
can go well above 20khz
and tune with a file all very interesting
a similar device is used to control snow faling and how it groups in airports
funny:
as a funny story:
it is a fact that the law can sometimes be in your favour
in the usa {as usual}
the court can order a noisey dog owner to have his dog de-barked
and you can also get a dog "de-clawed" or "de-fanged" quite crusum to do this to a defenceless animal and definalty one way to give it no defence so next time you get mugged it looks pretty stupid
only americans can do this .....
so after reading a few things as notes
1} Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz
2} you need simply to use a eor gate X2 as a doubler
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This circuit is used to double the frequency of digital clocks. The circuit works by causing a delay, by using gate "a". This delayed clock is the XOR'ed with the original clock and this gives a short pulse at the beginning of the original clock "high" and a second pulse at the start of the original clock "low". The width of these logic high pulses is the number of nanoseconds of the gate delay. More delays may be inserted between gates "a" and "b" for different pulse widths. For CMOS applications, IC1 should be a 4070. For TTL any form of a 74386 ( 74LS386, 74AS386, etc.) should be used. For the 74AS386 the maximum clock-in is about 166 kHz. For a 74LS386 the maximum frequency is about 28 kHz. For a 74386 it is about 25 kHz.