This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be used as a shield and the frequency is approximately 775 Hz.
This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from...
This flasher was originally intended for Christmas tree lamps. The circuit is from 1974 and uses...
The components used in this configuration are not common today. The circuit is from the 1982 SGS...