Found in 1967 General Electric documentation this circuit uses a PUT and a diac to generate 1 kHz signals. The circuit has a start switch.
This frequency meter, found in a 1987 documentation, uses indicator LEDs and can work with audio...
The Motorola MOC501O optocoupler has a complete amplifier inside the sensor, enabling the...
This configuration, well known to those who study digital electronics, was obtained in a 1974...