This circuit was found in an ancient American documentation. The power supply is not given, but we have the voltages used. The relay is sensitive type for high voltage.
Mouser Electronics is now shipping DA14585, a kit for the development of voice remote control...
This circuit found in Radio Electronics can be used in games to produce a random pulse train. The...
This circuit uses two light-activated SCRs or LASCRs, uncommon components today. The power depends on...