This circuit was obtained in an Electronic Design from the 80's. It has the adjustment of the gain through a simple potentiometer. The power supply must be symmetrical.
We found this circuit in a Radio Electronics from October 1963. The circuit uses an output...
This circuit from an American documentation from the 70s, indicates a photodiode to generate...
This circuit uses components that are still common despite being from 1995 documentation. The circuit can...