I'm wondering if there is a transistor which, when a voltage is applied to the base / gate, opens the circuit instead of closing it. If there is not, how would such a configuration be created?
EDIT: Okay, here's some clarification. I have a circuit set up like this:
Motor-------------Nmos-------------Gnd | | voltage from IC
Currently, I am supplying a voltage to the gate of the nmos from my arduino and controlling the motor that way. I want to replace the nmos with something which will perform oppositely. As the voltage increases on it, the current between motor and gnd should decrease.
I hope that helps clarify.