This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The transistor must be mounted on a heatsink and the transformer is a 1,5A secondary winding.
This circuit was obtained from a 1968 documentation and can be adapted to use current equivalent...
With this configuration we have a voltage follower, amplifier with unit gain, in which the output...
This setting that applies to any operational amplifier was found in an old documentation. For the indicated...