This variable voltage regulator circuit has a power stage capable of supplying currents up to 1 A. The power transistor must be equipped with a heat sink.
This circuit is from 1998 documentation. Output transistors and TIPs must be equipped with heat...
The LM121 integrated circuit is no longer common in our market, with more modern equivalent...
In the figure we have a protection circuit for sources that we find in a 1994 technical...