This circuit was found in an American documentation from 1969. Indications of the used transistors are not given, but general-purpose types can be tested.
This circuit was found in the Spanish magazine No longer in existence, Mundo Electrónico, in a...
This interesting circuit was obtained from a 90's EDN. What it does is generate negative voltages...
This step-down converter with 10 to 60 V input produces a 5 V output with a maximum current of 5...