0805 size high power resistors, 250mW ok on FR-4? - sci.electronics.design

Message from discussion 0805 size high power resistors, 250mW ok on FR-4?

Jan Panteltje

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More options Jul 24, 3:06 am

Newsgroups: sci.electronics.design

From: Jan Panteltje <pNaonStpealm...@yahoo.com>

Date: Wed, 23 Jul 2008 19:06:23 GMT

Local: Thurs, Jul 24 2008 3:06 am

Subject: Re: 0805 size high power resistors, 250mW ok on FR-4?

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On a sunny day (Wed, 23 Jul 2008 11:52:06 -0700) it happened John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote in
<urue84dk5os9eiihvr5d990o7lvhl7q...@4ax.com>:

>Cost about $10K, and worth it. I think some new technologies are
>coming on board, so prices will drop.

>In that second pic I posted, we thought that the FPGA (under the blue
>heat sink) was getting too hot as clock frequency increased, so we
>were looking into clock gating and tedious stuff like that. A few
>minutes with the Flir showed that the dacs (the white-hot blobs) are
>in fact heating the FPGA.

>John

Xcuse me, but would not a finger test show that too? That teh DACS were much
hotter then the FPGA?
I am not against modern tech, but 10k is a lot of money for something you
can also do with a temp probe or your finger.
;-)

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