Where has this current gone in my current-voltage converter?
This is my answer to SE EE question Where has this current gone in my current-voltage converter ? My answer The necessary philosophy I read these answers full of technical details and wonder how it is possible not to reveal the simple but brilliant idea behind this op-amp circuit consisting only of a resistor and op-amp? I realized it 30 years ago (Fig. 1) and with its help I was able to understand and explain many other op-amp circuits. Fig. 1. A conceptual picture of an active current-to-voltage converter from my archive (1992). Here is the translated text: May 14, 1992. "Ideal" current-to-voltage converter (a possible explanation by an opposite voltage). The current-sensing resistor RI creates a "harmful" voltage drop VR (it is necessary but undesired; there is a contradiction). We can destroy it by an "anti voltage" V(E)anti that is subtracted from VR (it is an inverse copy of VR). It can be implemented by an op-amp A that adjusts Vanti so that VR - V...