Take the 2-minute tour ×
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It's 100% free, no registration required.

I am looking for a case that would work well as a heat sink. Thinking that something like a car amplifier case? Anyone know where one could find cases like this? Would be using it to house H-Bridges and fill it with thermal conductive epoxy to water proof it....

share|improve this question
    
It would be a much cheaper idea to screw the power components to the case (e.g. TO-220's) then use some arbitrary potting compound and not worry about it having excellent thermal properties. –  Nick T Jan 27 '11 at 17:53
    
@mikeselectricstuff: This is a better kind of link for that message: lmgtfy.com/?q=heatsink+box :) –  bjarkef Jan 27 '11 at 22:21
add comment

2 Answers

up vote 5 down vote accepted

One of these extruded aluminium ones?

enter image description here

share|improve this answer
add comment

Those commercial cases might work, but you'll note that a car amplifier has many, large fins - this dramatically increases the surface area. Those commercial boxes just have some beauty stripes. Also don't forget the volume calculation: I don't know how much thermally conductive epoxy costs, but even, say, a 1 by 3 by 6 inch box has a fair amount of internal volume.

What you also could do is to salvage the heat sinks from the inside on an old PC power supply. These come with screws and insulators and are pretty big in terms of surface area. You might be able to bolt these to the outside of an otherwise flat box (you want to use gap filler between them) to heat sink it. Alternatively, just screw your high temp components to them and the encapsulate over them with your epoxy.

If you're in an environment that can tolerate it, using salvaged heat sinks and salvaged fans inside a salvaged power supply enclosure would likely work well.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.