Without regulation, this basic circuit has the output current, and voltage determined by the transformer. The input can be 110 V and 220 V if the transformer used is of the indicated type.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This circuit was found in a Popular Electronics from the 90s. The circuit uses general purpose...
This voltage regulator circuit has a traditional configuration with two transistors, and can be...