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.
Although the so-called “boots” or amplifiers that increase the power of transmitters are not...
Another of the many similar configurations we have in this section. This one is from a Radio...
The current of this charger is determined by Rs. The circuit is from the 1982 SGS linear...