Rigol DP832 replace 80mm stock fan with 92mm

thingiverse

I made this fan duct, to mount a 92mm fan in the Rigol DP832 Power Supply. The Rigol DP832 Power Supply is unfortunately a bit too noisy for my taste. I did a little bit of research what other users do to minimize the noise, but I did not like any idea others came up with, so here is another idea. ;-) In my Rigol DP832 is a SUNON ME80251V1-000C-A99 fan installed: RATED SPEED: 3200 RPM AIR FLOW: 69.65 m³/h STATIC PRESSURE: 4.57 mm H₂O ACOUSTIC NOISE: 33 dB(A) CURRENT @ 12V (measured): 136mA I could not find a 80mm fan which had a similar air flow and is much quieter. Luckily there is just enough room in the power supply for a 92mm fan with a fan duct. I used the 92mm fan NOCTUA NF-A9 PWM: RATED SPEED: 2000 RPM AIR FLOW: 78,9 m³/h STATIC PRESSURE: 2,28 mm H₂O ACOUSTIC NOISE: 22.8 dB(A) CURRENT @ 12V (measured): 65mA Here is a quick video to show/here the difference between stock fan and the noctua. (noise compare is at the end of the video) <iframe width="560" height="315" src="https://www.youtube.com/embed/9SyxvPYLadM" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe> The Rigol DP832 has a fan fault detection by monitoring the consumed current by the fan. The NOCTUA NF-A9 PWM consumes not enough current, so it triggers the protection and the Rigol DP832 switch off the outputs. To consume more current I add two additional SUNON HA40201V4-000U-999 fans, each fan consumes 40mA. The original fan draws 136mA and the three replacment fans drawing 145mA in sum. Thanks to Travis Howse for his awesome example: https://www.youtube.com/watch?v=_2r9bWsVwdM (This was my first try with openscad, maybe not very elegant, but it worked...)