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.
This circuit was obtained in a 1975 documentation. It is intended for old vehicles that still use...
With this circuit it is possible to select transistors and their compliant test. Or circuit...
This power supply circuit with selectable voltages was found in the June 1979 issue of Radio...