Need example for using optoisolator & FET

[Dan Oelke]

I am working with an FTC team and need an example circuit that I can help them get wired up to drive a string of LEDs. We can't directly connect the power so we need an optoisolator.

(see post #59 here explaining that we have to use an optoisolator
http://ftcforum.usfirst.org/showthre...r-Thread/page6 )

I am not an expert, but the optoisolators I have found can drive 10's of milliamps and the strings of LEDs I have are in the 200mA range. So I assume I'll need the optoisolator to drive a MOSFET which will controll the LEDs.

What I could really use are some example part numbers that we can order and get quickly. I know just enough to be dangerous <grin> so when I think I've found a part that might work well then I find I can't get it for 3 weeks. <sigh>

Thanks for any pointers to circuit diagrams and/or part numbers