Interface with low current, high voltage Devices

Forum 2005-2010 (read only) Hardware Interfacing
1

So, I have a few 24VDC devices that pull about 40mA. Could I simply use a transitor at the output of the arduino to switch these devices at 24V? I know I could use a transitor to relay to do it, but I'd rather keep my components solid state and low in number. Any suggestions?

2

Yes, a simple transistor can be used to switch the load on and off to ground (be sure the Arduino ground is wired to the 24vdc ground). If using a NPN transistor there will have to be a series resistor between the Arduino output pin and the base of the transistor. A logic level N-channel MOSFET would work very well and not require a series resistor.

Lefty

3

hmm, I didn't think about MOSFETs because they are typically used for high current loads, but I suppose it wouldn't hurt.

Thanks! Didn't want to damage these things, buggers are $100 each to replace.