Well, bear in mind that you can parallel several FETs to share the heat
dissipation.

15A is a lot, though, at 15VDC. That's, what, 225W? I made one recently to
do
markedly less (only 2A), using a couple of our bigger heat sinks along with
a
couple of FETs:
http://www.sparkfun.com/products/10213
http://www.sparkfun.com/products/9576

There should be a couple of tutorials hitting our website soonish- one
covering the
heat sinking needs and another covering the actual design of the circuit.
When they
hit I'll post to this thread.

MikeH

On Fri, Sep 30, 2011 at 11:01 AM, doug metzler <doug.metzler@gmail.com>wrot=
e:

> I'm thinking something benchtop with an analog ammeter and a big set
> dial that I can use to test FET heat under different load conditions.
>
> I did some googling but I only found babies - 0-1A.
>
> Do you guys know of anything that might fit the bill?  Unfortunately
> cost is a large consideration right now, but high accuracy is not
> necessary.
>
> for my purposes I'll be testing with 15VDC
>
> Thanks,
>
> DougM
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