cosmos275:
Hi, I'd like to use an ST IRF740 MOSFET to flip a switch on a 24VDC motor.(HTTP 301 This page has been moved)
Can i just hook the output up of the Arduino up to pin 1, ground to pin 3 and 24VDC coming through through the motor to pin2? I'd like the circuit to be as simple as possible. Anything else I need? I've seen some circuits out there but I'm unsure why they have more components.
Thanks!
That is a very poor choice for the mofet, it's a 'high voltage' mosfet and has a corresponding high Ron value meaning it will run hot. It also is not a 'logic level' mosfet and requires +10vdc gate/source voltage to turn on fully to reach it's best Ron value. A better mosfet would be a logic level n-channel MOSFET such as SparkFun sells:
Wiring is pretty much as you stated, except most recommend a series 100-150 ohm series resistor between that arduion output pin and the gate terminal. Also you need a common ground wire run between the 24 volt negative terminal to the mosfet source terminal and then on to a arduino ground wire.
Lefty