} For portability, use a 9V PP3 battery and house the unit inside a pocket radio cabinet. "buttonWithQuantity": false, "imgWithCarousel": false, Here’s a circuit that generates 21 to 22 kHz (frequencies just above the audible range), so it can be used to call your pets by generating ultrasonic sound. function ShopifyBuyInit() { Thank You for your replay.Here are more details as below. "margin-bottom": "0px" }); "button": false, "styles": { var script = document.createElement('script'); }, }, The advantage of the dog whistle is that it doesn’t produce a loud irritating noise for humans that a normal whistle would produce, so it can be used to train or command animals without disturbing nearby people. "button": true "color": "#ffffff" Is there one of these available to deter bovine animals, I’m a farmer and have been attacked, I’m lucky to be alive, some people have been killed by cows post calving, and by bulls. } "contents": { Many commercial pest repellers based on this principle are available, most of them … "margin-left": "-20px" }, "contents": { } else { All attempts so far havent been successful as high frequency performance tends to drop dramatically with the 555. "buttonWithQuantity": true, "description": false, /*]]>*/, /**/, Network Consists of Further Focused Websites (Channels). } "compareAt": { Is this at night with low temps? "styles": { The first 555 oscillates at around 1.5 Hz and modulates the frequency … wat is da exact ic dat i ned 2 use 4 dis circuit??? Due to its relative simplicity, ease of use and low cost it has been used in literally thousands of applications and is still widely available. ui.createComponent('product', { I have use this module and it works fine,now using the reference circuit above i made", "Why the Negative feedback capacitor value is increased from 47uF to 100uF ? "buttonWithQuantity": false, "font-weight": "bold" The elderly in particular use a cat-deterrent in their garden. "padding-right": "20px", "padding-left": "20px", }); Thus it could be utilise as part of a dog or cat deterrent system to help prevent unwanted damage to gardens or flowerbeds, or a battery powered version can be carried for portable use. Fixed Frequency Dog Whistles. }, "color": "#000000" } }, If the dog repellent circuit was fed by a bench power supply rather than a battery that restrict the available current, the output reached 110dB with 4A running through the speaker which is plenty loud enough! 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