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.
May 2017 - Mouser Electronics is announcing the availability of Omron's new 2JCIE-BL01 environment sensors for...
We found this circuit in a 1986 documentation, but it can be easily assembled even today by the...
The CUT frequency for this filter is determined by the capacitors. The µA4138 is a quad version of...