I have a DVR with a noisy 40mm 12V case fan. Not very loud but it's always been that way. I have a few fans that size from a HDD cooler. But those fans spin too fast and make even more noise than the faulty one. I had some resistors in a harness to reduce speeds on a motherboard fan setup But I can't find those right now. So I got to thinking would any of you electrical wizards be able to suggest a value of resistor to use on a 12V 0.06a DC fan motor to cut the speed in half?