The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
This project was found in a 1988 documentation. The circuit intermittently activates an aquarium...
This circuit was obtained from an English magazine from 1976. The circuit operates two LEDs and...
EZP-Q metallized polypropylene capacitors from Panasonic's can be purchased from Mouser...