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From: jmuchow@SPAMMENOTcamlight.com (John Muchow)
Subject: Re: Question about linear derating factor for MOSFETs
Date: Wed, 13 Nov 2002 05:46:20 GMT
Organization: MindSpring Enterprises
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X-Server-Date: 13 Nov 2002 05:47:15 GMT
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I wish I had the volume to make a custom extrusion worthwhile...3 feet
a year probably isn't high enough. :-)
last week, I priced out some Thermalloy extrusions I was considering.
They ranged from $600 to $1900 for 6 feet!! Melcor
(http://www.melcor.com) had some nice bonded fin heat sinks at what
thought was great prices. They're made for their thermoelectric
coolers but will work fine for a lot of things and they have fan
mounts too (purchsed separately). These are the ones I've been using
in my calculations.
>>>Hell, even heatsinks from these guys are ripoffs. A typical price for
>>>custom extruded aluminum shapes (directly from the extruder) is $2.50 per
>>>pound. If you calculate the cost per pound for a commercially available
>>>heatsink, it is 10 times that. It pays to make the tool (extrusion tools are
>>>cheap) and squirt out your own if there is even a moderate volume involved.
>>>I can't remember when any company I worked for actually BOUGHT a commercial
>>>heatsink. The joke is that none of the commercial heatsink companies
>>>actually extrude anything. They contract it out to a real extruder (the same
>>>people one can go to direct).
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