Yes the 1/2" unit would be better. The EB104 dumps mega-watts of heat in a
1" square of spreader. The thicker conductor will allow a wider path
through the conductor to spread the heat.
Can you go too thick? Thermally wise yes. You want the heat to get out of
the unit. That means passing it horizontally away from the device and then
vertically to the HEAT SINK then to moving air through the heat sink. The
copper will heat quickly and retain heat past the time your blowers are
turned off.
While I have never tested spreaders over 1/2" I feel you would thermally
gain additional path for conducting heat away from the components up to the
width of the component itself. Any more would be counter productive.
Nice selection of the EB104, those transistors are way cool but still around
900 a pair. Hits the pocket like a pair of 8877's in the old days.
Bob K0DD
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Duane B
Sent: Tuesday, August 29, 2006 9:17 AM
To: AMPS
Subject: [Amps] Heat spreader for solid-state amps
Hello everyone,
Is there such a thing as having to thick of a heat spreader? I have
access to two pieces of copper bar stock plates. Both are 6" x8", but
one is 3/8" thick and the other is 1/2" thick. Oh, by the way, I'll be
building the 600 Watt SS Amp, EB104. Communication Concepts Inc, sells
a 6" x8" x 3/8" one, but would the 1/2" be any better?
Thanks for your comments.
73's
Duane
W5DMB
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