This circuit was found in a 1967 US publication. In it we have the implementation of a ring counter using only relays. Relay free contacts can trigger indicator lamps or LEDs.
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...