This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and powers an audible indicator.
June 2017 - Vishay Siliconix's new Generation IV (Gen IV) Channel N MOSFETs can now be purchased...
This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer...
September 2016 - Mouser Electronics already has in stock the new TPS63070 Buck-Boost converter...