I am trying to build my own rackmount cooling setup, like thisI figure I would just get 4 fans and wire them in parallel with a toggle switch in series. Here's a rough wiring diagram.I have calculated, based on Ohms law that each fan has a resistance of about 75 ohms and needs 0.16 amps. If I run four of them in parallel, the entire circuit needs 12V and 0.64 amps. But most 12v power supplies online that convert AC to 12vDC have 2 amps of current. So what is the best option to safely bring the amps down to .64 amps without decreasing the voltage?I am a little confused as to how I would wire up the third pin that controls fan speed.What about if I wanted a turn-knob that let me adjust the voltage from 5V up to 12V to control fan speed. Is that something that is simple or really complex?The Fans: http://ift.tt/2rzHBzp toggle switch: http://ift.tt/2sxoWSg voltage: 12vDCThe amps: 0.64 ampsThe power supply: ? via /r/DIY http://ift.tt/2rNmZVB
