We found this transistor circuit in a 1967 General Electric documentation. The circuit makes use of components that can still be easily found on the market, and the SCR may be a 106 type.
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...