In this 1990s circuit, found in a National Semiconductor manual, the output voltage is the square of the input voltage. The components are from the period.
In figures 1 and 2 we have two current drains that can be made with operational amplifiers and...
Great sensitivity for the circuit can be obtained with a Darlington amplification step for the...
The used diode is an unusual component today. We found this 12 V regulator in documentation from the...