This interface shield circuit is from the 1983 Intersil Databook. The components used are uncommon today. ADCs are low-cost digital converters. The power source voltage must be 5 V.
Found in a 1990 PE Hobbyst, this 4-digit circuit has a high response speed. The circuit is based...
This configuration that functions as a zener diode was found in an English publication from 1976....
This circuit was found in a 90's EDN. The circuit provides two 15 V outputs and one 5 V output...