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 found in a Ferranti documentation from 1969. The transistors are common types of...
This powerful amplifier with 2N3055 transistors at the output provides a few tens of watts rms on a...
This interesting circuit is suggested by National Semiconductor and is based on an LH0062...