This circuit converts a constant input current intensity into a voltage given by Vo = -R x I. T1 must be equal to R. The operational admits equivalent.
The coil can be formed by 100 turns of 26 or 28 wire on a ferrite rod in this medium wave radio...
This circuit is from a 1968 Electronic Design. The characteristics of the output transformer are not...
This circuit is from a 1970 publication, having been implemented with germanium PNP transistors. We can...