This circuit was found in an American publication from 1965. The circuit uses components from that time. No information was given about the excitation transformer. Observe the high input power.
This circuit was found in a 1985 English magazine, but it can still be easily assembled, as the...
We found this circuit in a 1956 documentation from Sylvania. The circuit is for bench testing and...
Although indicated in the original publication of the 1980s as a capacitance switch, the circuit...