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 Popular Electronics of the 90s. The resistor R4 determines the load...
Obtained from a 1980s Signetics documentation, this circuit uses a common integrated circuit at the...
We found this circuit in the Linear Applications Handbook by National Semiconductor. The circuit is...