This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and powers an audible indicator.
The illustrated circuit uses the AUIRS2301 S from International Recfifier (www.irf.com) and is...
This timer was found in English documentation from the 80's. The integrated circuit is common...
This circuit is from an Electronic Design of the 90's. The circuit can be implemented with more...