This circuit appears on this site from different sources. This is from documentation from the 1980s. The operating system used is uncommon and can be replaced by a more modern equivalent.
This sole beacon which has a battery charged by photocells was found in documentation from 1991....
The supply voltage of this circuit can be between 4 and 20 W. The power depends on the voltage and the...
This 555 IC circuit was found in the November 1994 issue of Radio Electronics magazine. The...