Using SCRs, this circuit from a 1967 General Electric manual allows full wave load control with SCRs. SCRs can be modern types depending on the load.
We found this circuit in the 1983 Radio Electronics Special projects magazine. The components are...
With the presented circuit it is possible to detect signals from transmitters in a frequency range...
This circuit was found in a British documentation from 1969. It can be implemented with modern...