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.
When powered by a 14 V supply this circuit source 5,2 W to a 4 ohm load. For a 2 ohm load this...
This three-transistor amplifier uses a JFET at the input to increase the input impedance. The...
In the figure we have the way to obtain an adjustable constant current source of 2 mA. The...