I'm trying to work with IRF640 FET transistor (picture attached). FET transistor picture The problem is when I put 11V on the G-S voltage. The D-S voltage is 4-6 volts or more. Why the transistor doesn't open fully? What am I missing? In the simulator, the voltage falls to 120.18mV.(as expected) the schematics attached. simulation and assembly scheme Thank you.