This circuit was found in a 1970 American publication. The FETs are power types according to the desired output current. The operational can be replaced for modern equivalents.
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...