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 ...

Quadcopter type drones can be flown indoors, but unless you have a lot of space, it usually just ends in a crash. The prospect of being hit in the face by the propellor blades, spinning at 10k RPM ...

Ultrasonic Burglar Alarm: Transmitter and receiver parts of the circuit are connected each other by using a triple cable. System operates with 20V supply and 10V effective output voltage drives the ...