04-09-2021, 03:51 AM
3.3V is not enough to run these fans, and it would interject too much noise on the 3.3V line if it would work. I would recommend a standard diode (1N4001 or similar) in series with either 5V or ground going to the fan (you will need use the proper polarity in order to make it spin). Standard diodes have about a 0.7V drop. You might be able to put two in series to drop the voltage by 1.4V.
Personally, I have not used a fan with the DE-10 in 2 years now. It's not needed. Future versions of this board will not longer have a fan cutout. You don't actually need a fan or a heat sink (per Terasic, the manufacturer of the DE-10 Nano). I did a test where I ran the DE-10 without a heatsink or fan in a setup with an ambient room temperature ranging from 100 to 145 degrees F for several weeks with no issues.
Personally, I have not used a fan with the DE-10 in 2 years now. It's not needed. Future versions of this board will not longer have a fan cutout. You don't actually need a fan or a heat sink (per Terasic, the manufacturer of the DE-10 Nano). I did a test where I ran the DE-10 without a heatsink or fan in a setup with an ambient room temperature ranging from 100 to 145 degrees F for several weeks with no issues.