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 ...

To use this circuit adjust 4k7Ω Resistor at resonance frequency of the piezo transducer for maximum amplitude of the repeller ultrasonic sound. At 11 KHz to 22kHz this can reach a value of 10Vpp and ...

Conceptually the circuit there is simple, consisting of the ultrasonic receiver, followed by a transistor amplifier for the modulated wave, then a diode for demodulation, another transistor ...

Using ultrasonic technology, this 3D printer offers a gentle, non-contact method to manipulate material particles and sensitive components into full electronic circuits. Ultrasonic research ...

[Mike] saw a few videos of ultrasonic acoustic levitation rigs put together by student researchers. Figuring it couldn’t be that hard to replicate, he set out and built his own using surplus … ...

This power-amplifier pair drives piezo and ultrasonic transducers for industrial and medical applications. The MP111 controls a pulsed 50-A output current on a 100-V single-ended supply and 500 ...