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.
This full wave source uses germanium diodes, and its current is a few milliamps. We found it in an...
This circuit was obtained from a 1965 magazine, but can still be assembled if we use a modern 6 V...
The transmitter can be that of CB9574E. This receiver uses a PLL to directly trigger a sensitive relay....