We found this circuit in a 1967 documentation. The integrated circuit and an operational one of the time. Modern equivalents can be tried out. The power supply is symmetrical.
Equivalent operational amplifiers can be used in this circuit of the 1990 Linear Databook,...
This 4-20 mA current interface was found on a 90's EDN. The components used are not common today and...
This circuit was found in a 90s Popular Electronics. The integrated circuit used is uncommon...