This circuit was found in documentation from Analog Devices from the 90s. The circuit uses components from that time, which are not common today. It serves as a reference.
Using the 741 operational amplifier this circuit was found in the August 1993 Electronics Now...
We found this circuit in a 1967 documentation. The circuit can be designed based on current...
Found in Popular Electronics, this configuration can be powered by voltages from 6 to 12 V....