Found in an Electronic Design of the 90's, this circuit provides an additional 12 V output to a 5 V regulator. The maximum current is 200 mA.
This version of the circuit is from 2000, using a source of negative voltage that allows to obtain...
This somewhat complex circuit was found in the May 1984 issue of Radio Electronics magazine. The...
This basic circuit is from an old documentation. The relay must be 50 mA maximum and must have a...