This Linear Technology circuit can measure currents from 100 pA to 100 uA. The circuit is from the 80's, using a component of the era. Transistors are general purpose types.
This National Semiconductor circuit uses integrated circuits that are uncommon today. The circuit...
This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very...
This circuit was found in a 1960 transistor manual from Sylvania. It measures the intensity of...