This circuit was obtained in a documentation from the National Bureau of Standards of 1968. The circuit is of low current and the output can be changed to voltages between 2 and 30 V.
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...