This circuit for currents from 500 mA to 1.5 A was found on a Ham Radio from the 90s. R4 determines the current in the load under test. Transistors must be equipped with radiators.
RF voltmeters can be tested with this circuit that generates a test signal. We found it in old...
This circuit is recommended by Texas Instruments in the datasheet of the TL317, equivalent to...
This circuit for incandescent lamps was found in an American documentation from the 80s. The...