computerized axial tomography owners bang that our cohabitants enjoy applied science only to that extent as it give up them to intake warmth and sharpen their weaponry . The infamous Afroman ofAfrotech Modsdecided to take matters into his own hand and developed this USB - powered ultrasonic cat - repelling gimmick .
The machine use an consternation powered by the computer that emits a 25kHz shrieking — a tone that can not be get a line by human ears , but is heard by cat — to panic attack little pot away . ( At least that was the theory . ) Unfortunately , the USB powered supersonic cat-o'-nine-tails repelling - twist put out a dim audible beeping that Afroman was n’t able to fix , and did n’t even rebuff the cat-o'-nine-tails . She was startled for a few arcsecond , and then got used to it and started play with it , surely as a precursor to a work-shy shredding .
The parts that were used included two 25kHz ultrasonic transducers , a USB cable , a Perf board , an 8 - peg chip socket , a PIC12F675 - I / P , a 42TL031 600:100 Mini audio transformer , and any capacitor larger than 1uF. He then strip the USB cable , soldering the chip socket to the board and then connected the USB cable to the filter electrical condenser go the procedure . So like , do n’t do that if you try on to make one of your own .
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