Rigol DP832 replace 80mm stock fan with 92mm

thingiverse

I built this custom fan duct to mount a 92mm fan in the Rigol DP832 Power Supply. The Rigol DP832 Power Supply generates an unacceptable level of noise for my taste. After researching various methods to minimize the noise suggested by other users, I decided to create my own solution. Here's what I came up with. My Rigol DP832 features a SUNON ME80251V1-000C-A99 fan: 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 struggled to find a suitable replacement fan with similar airflow and significantly lower noise levels. Fortunately, there's just enough space in the power supply for a 92mm fan with a custom duct. I opted for the 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's a quick video demonstrating the difference between the stock fan and the Noctua NF-A9 PWM: <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 built-in fan fault detection mechanism that monitors the fan's current consumption. Unfortunately, the Noctua NF-A9 PWM draws insufficient current, triggering the protection circuit and shutting down the power supply outputs. To resolve this issue, I added two additional SUNON HA40201V4-000U-999 fans, each consuming 40mA. The original fan draws 136mA, while the three replacement fans collectively draw 145mA. Special thanks to Travis Howse for his inspiring example: https://www.youtube.com/watch?v=_2r9bWsVwdM (This was my first attempt at using OpenSCAD; it may not be the most elegant solution, but it worked.)