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.
If you have old tube or transistor amplifiers that hum (60 Hz noise) the circuit shown may be the...
The integrated circuit used in this regulator is unusual, as are the transistors. The circuit is...
Other settings like this can be found on this website. This makes use of old operational...