I am using a 4n25 opto-isolator to turn on a N channel mosfet. Most of the circuits I see us the opto output to pull down a voltage and turn off the mosfet. Why can't I use the optoisolator to switch the voltage on and off the gate of the mosfet. The mosfet doesn't draw any current only needs a voltage. What is the internal resistance of the mosfet output if there is any. Mine reads about 35 ohms when on. I might have already blown them.
Thanks for any help with this.
Thanks for any help with this.