We found this circuit in a 1966 documentation. The circuit is intended for a door opening system by the headlight of a car. The sensor is a photo-FET, an uncommon component today.
We found this circuit in an Electronics Handbook from the 1980s. It filters out noise from a radio...
We found this circuit in the May 1989 issue of Radio Electronics magazine. The circuit uses...
This TTL circuit generates a 100 MHz signal for digital instruments. The CI is not easy to obtain,...