Gary wrote:


I'm finding that if you're looking for any heatsink that there are
zillions of places to pick one up and that if you are looking for
a particular sink that it is a futile task. With a little help
from my friends, I'm putting together the mosfet amp in the 2006
handbook and I've pretty much secured everything on the parts list save
the heatsink. It is the same unit that was used on the original FARA
amp as well. Anyone have this beast in the junk bin or know of a
purveyor who might?? I've scoured the web and no joy so far. The sink
is an AAVID part (#244609B02). Thanks in advance all.

Gary
ka9rao

Aavid makes so many heat sinks that you almost have to buy custom to get
what you need.

Usually your best bet with heatsinks for a one-off is to find one that
meets your needs and use it, even if it's not identically the same thing
as the plans.

If you can find one with specifications get one that matches the thermal
conductivity to the air as what you have; if you can't get one with
specifications look for about the same or greater total surface area and
fin spacing.

The handbook used to have directions on bending heatsinks from sheet --
you basically make a bunch of nested 'U's with heat sink compound
between. I don't know how well that works, or if they still do it. I
suspect that for natural convection you'll be fine with that.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html