Products > Test Equipment
Korad KA3005P power supply: UI changes
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bateau020:

--- Quote from: tooki on April 18, 2022, 07:44:25 pm --- Early KA3005P units like mine at home have a very different heatsink from later units, one that causes far more turbulent airflow. Replacing the fan in those (which I did in mine) does improve noise, but not by very much. It’s my understanding that the new heatsink design is much quieter.

--- End quote ---
Not only that. Mine (and probably also yours, many versions exist though) uses a fairly low frequency PWM to drive the fan, making it jitter. Hence the noise.
Adding a cap in // to the fan lowers the noise a lot, and is easy to do.
I however just installed an independent temperature driven fan driver circuit and replaced the fans with quieter 4 pin PWM fans. Completely silent now, unless I drive the PSU hard. And even then, it is still a lot better than before.
MikeK:

--- Quote from: bateau020 on April 21, 2022, 08:31:23 pm ---I however just installed an independent temperature driven fan driver circuit and replaced the fans with quieter 4 pin PWM fans. Completely silent now, unless I drive the PSU hard. And even then, it is still a lot better than before.
--- End quote ---

Are you using an NTC thermistor and an 8-pin uC?
bateau020:
Even cheaper: one of the many temp controlled fan controller boards from aliexpress. I used a dual controller, since I have the 2 channel version of the PSU. But many single channel versions also exist. Took the power from one of the cables going to the front panel (18V AC? if I remember right), created the controller board power via a buck converter (you guess where I got the latter) and mounted it all on a bracket. For some things buying is cheaper than building.
MikeK:
Is the fan controller board using a uC?  I may make this mod to my PS, but I'd rather not have a uC that could fail and cause overheating.  (We all make coding mistakes.)   I'm thinking an NTC and comparator.
bateau020:
There are specialised chips for fan controlling, but an attiny214 for example could also do it. Github has some fan controller projects. Just use the watchdog or do repeated resets. If you want more security, you could add a comparator and a buzzer or relay for example.

edit: or you could use a standard thermal fuse that you place in the mains line.
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