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.
We found this circuit recent English documentation. The circuit uses a common transformer and can...
This 90's Electronic Design circuit converts the period of a signal into a frequency. The...
This circuit, shown in the figure, can operate from 4 to 100 MHz, based on a 2N2222 transistor or...