This static switch circuit appears elsewhere on this site from other sources. This was obtained from a Motorola documentation for 1968 power circuits. The Triac can be another according to the load.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...