Found in 90s Popular Electronics, this circuit fires a load through a MOSFET from an audio signal applied to the input. Power supply is done according to the load.
This version of triac control is from a 1968 documentation. The circuit uses components from the...
Found in a 90s QST magazine, this circuit uses components from that time. No information is given...
This circuit is basically the same configuration as the previous one with a power stage with...