I'm using mosfets for the first time and am having a bit of trouble. I need to drive a 24V motor with an H-bridge - i've got it all set up and it works when the logic circuit and motor use the same supply (eg. 10V), but when I connect the motor's power supply (24V) and leave the logic power supply at 12V, the motor only gets about 10V across it. Why is this? I've been trying to find an answer on the internet and somewhere it seemed to imply that the voltage applied to the gate had to be Vin + Vgs, ie. in my case that would mean I have to apply 34V to the gate. Does this sound right?