I am at a loss to find an efficient way to control a power FET with the 5V logic of an Arduino.
In the attached schematic, if I leave out Q3 then I waster power through Q1 when I want to turn Q2 off.
If I leave Q3 in then it is inefficient re parts and a voltage drop across CE of Q3 that is not available to the FET gate.
It appears to me that a relay or a gate driver IC (minus the FET) are really the only practical and efficient way to control 12V logic from 5V logic?
I am trying to control a solenoid valve that operates at 12V and about 200-300mA