cvoinescu wrote:Depending on what amount of 12 V power you need, a DC/DC converter like this one may be more convenient than a second power supply.
cvoinescu wrote:Not a good idea to connect fans in series. Their impedance varies, so one fan can get more than 12 V and the other one less. If you accidentally stop one fan, the voltage drop on it will decrease, and the other fan may get as much as 20 V. That can even happen when they start: if one is a little slower to start, the voltage on it drops and it may stall, again subjecting the other one to more than half the supply voltage.
If you have only one such fan to supply, that item I pointed you to should be just right; for two fans, you can easily afford one for each fan.
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