Ultrasonic Tx-Rx Tutorial

This is a compact three transistor regenerative general coverage receiver with fixed feedback....

This is an improved version of the audio interface commonly used to connect a computer soundcard...

The 2 pushbuttons = S1: Start/Pause. S2: Stop/Reset. If you want to play your message, put S3 at...

This circuit is a small digital ?roulette''. It is constituted by oscillator IC1, the counter...

The controller circuit can reduce a fan"s noise, power consumption, and wear, particularly in the...