This circuit was originally intended for reading movie soundtracks. The circuit is from 1967 and was found in an English publication. The sensor is semiconductor type.
This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the...
This circuit uses a diode to generate white noise for various applications. One involves the...
This circuit is a reminder for drivers who leave the headlights on and the car does not have the...