Fan Base with temperature speed control

After playing with the little Adcom mosfet amps and turning up their bias points to "bloody hell this gets hot" levels , I decided that I needed some ventilation assistance.

I initially bought two of these ultra quiet fans and attached them directly under the heatsink of the GFA5200 - worked very well as I hooked the power supply up inside the amp and it did the trick. But then, I bought another Adcom amp , this time the GFA5300 which has heatsinks on either side of the amp and can be biased up even more.

I came up with the plan of having them on a platform and sticking fans into the platform. after looking at a few fan options, I decided to stick with the fans I had originally chosen and picked up 2 more. This forced me to make something more functional and I stumbled across a fan control board which can be had for the bank breaking cost of $3 ( including shipping from China ) and rigged up a little CLC filter for the DC supply - to supress the voltage surges from the fan from messing up the clean power to my stereo.

Here are a few pics of it all

First - in the unit with an amp sitting on top of it



Pulled out from under the amp



the underside



the CLC filter



The little controller board



this board allows you to set min and max speeds as well as the temperature at which it kicks up to max speed. I disabled the beeping alarm.

and finally the little temperature probe that sticks up onto the heatsink




All fairly simple but it works a treat and is not audible.

.dB

 

Nice work. Are those 80mm noctua redux fans? I'm guessing the small gap is enough to draw in cool air? With low rpm I'm sure it's not an issue but I'm curious.

 

Yes, they are noctua units and there is an amazing amount of airflow.. dB

 

I like the idea of using cardboard as a breadboard. I actually use cardboard a lot as a basic insulating surface, but never thought about attaching components to it. Probably scared the cardboard would catch fire from the iron.

 

For maximum efficiency it might be beneficial to block the entry between the fans, so that the air can only come out from the center, thus creating larger loop of circulation.