The LM138 series of adjustable 3-terminal positive
voltage regulators is capable of supplying in excess
of 5A over a 1.2V to 32V output range. They are
exceptionally easy to use and require only 2 resistors
to set the output voltage. Careful circuit design has
resulted in outstanding load and line
regulation—comparable to many commercial power
supplies. The LM138 family is supplied in a standard
3-lead transistor package.