This is a low-gain amplifier to operate as a booster. We found it in an American documentation from 1947. The circuit uses a coupling transformer at the input.
In the figure we have a circuit that allows to increase the maximum current from a 78xx to more...
This audio millivoltmeter was found in a 1992 publication. It can still be assembled, as the...
This circuit is indicated to determine the flight time of an electric motor model airplane. The...