Found in a 90s Electronic Design this circuit provides an additional 12 V output to a 5 V regulator. The maximum current is 200 mA.
This interesting circuit for testing NPN and PNP transistors for general use and medium power was...
We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the...
Published in Radio Electronics in January 1963, this circuit uses 5 transistors of the time. The...