This circuit was obtained from a 90s Radio Electronics. The value of R1 determines the scale according to the table next to the diagram. The power suppley must be symmetrical.
We found this circuit in the 1993 Motorola Linear Interface ICs. The operational is unusual today, but...
The difference between this circuit and the previous one is that it uses PNP transistors. The...
This circuit was obtained in an old American documentation serving only for general purpose NPN...