This circuit can be used to obtain a zener voltage from a common zener of another value, adjusting in a multimeter. The circuit is from an American documentation of the 1970s.
I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but...
We found this circuit in the 1977 National Semiconductor Audio Handbook. The circuit produces a...
In the figure we have the basic configuration of a regulator for 12 V x 1 A suggested by Motorola in...