Dog Whistle for Ronja

Ronja is the author’s dog, a beagle-mongrel,  who seems increasingly frequently to wish to be  referred to as to heel either with a shout or with a  whistle. And so the theory took place for an  digital canine whistle that would produce  two alternating excessive-frequency tones. A  design like this has a quantity of benefits over  standard whistles or nameing.   Circuit diagram : Dog