I have got a load of "these(http://www.rollingstone.com/music/news/singer-songwriter-jj-cale-dead-at-74-20130727)": fans that I want to use for cooling. They are 4 wire and just using the red and black they individually work ok at full rpm. When i connect them in parallel they stop working and I am guessing there is some kind of interference causing the motor speed controllers built into each unit to fall over. I've tried running each through a diode and put a 10000 uf cap close to the units of each but still cannot get more than one unit to run at a time, any suggestions as to what i have over looked.
thanks in advance
thanks in advance
