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.
Found in old American documentation, this receiver transmits signals via the power grid. We can...
This is a project that can easily be adapted for other purposes such as counting people, objects,...
We found this circuit in an English publication from 1969. It shows how we can implement a bridge...