ALL IN ONE REPELLENT CIRCUIT INTRODUCTION Now i am going to introduce you an All in one Repellent circuit. Ya i mean it, by using this circuit you can keep nasty insects, Mosquitoes, lizards, and dogs away. Lets look the PRINCIPLE of this circuit:- This circuit works under the Principle of Ultrasonics. As you may know, we can't hear Ultrasonic sounds but animals or insects like Mosquitoes, bees, lizards and even dog can hear Ultrasonic sounds well. How this repellent circuit keeps Insects, lizards, Mosquitos and Dogs away? As i mentioned above, they can hear Ultrasonic sonic sound well at a particular Frequency range. Above that, they may get IRRITATED continuously. That's how this repellent circuit works. CIRCUIT DIAGRAM FOR ALL IN ONE REPELLENT CIRCUIT. CIRCUIT EXPLANATION FOR ALL IN ONE REPELLENT. The ALL in one REPELLENT CIRCUIT mainly consisting of a 555 timer, Frequency determining network, and a buzzer. The 555(NE555) timer is wired here as an ASTABLE MULTIVIBRATOR, whi...