This ultrasonic dog repeller circuit will chase away angry dogs. It is build with the all known 555 circuit, a buzzer and a little ferrite transformator. The ultrasonic frequency must be set with a ...

When we hear the word “Ultrasonic” we often refer it to bats and dolphins communication. Technically, “Ultrasonic” applies to sound that is anything above the frequencies of audible sound, and ...

Two-wheeler riders who often come under stray dog attacks have something to cheer about. A group of engineering faculty members have come up with ‘Sudog’ (Super Dog Chaser), a device that would ...