This UPS circuit was published in the March 1985 issue of Radio Electronics magazine. The components used are still common, although some may be difficult to obtain.
This optically coupled circuit was found in the February 1968 Radio Electronics magazine. The...
This circuit uses a special 1950's RCA strobe tube. It can be built with equivalent components for the rest...
This circuit, already explored on this site, can be applied to other comparators in the same...