I just purchased a MK2B dual-power heated bed to use on my Mendel90 project, using a 12-volt power supply (hacked ATX 600 watt PSU). What value/type/voltage/etc. LED and resistor should I use on it? Anything that Radio Shack would have on the shelf, since we have one in town? Yeah, I know they're optional, but it would be nice to have a visual indication that the bed is turned on.
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