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Message-ID: <001401cbb4fc$59b40780$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: "RSGB LF Gp" <rsgb_lf_group@blacksheep.org>
References: <AANLkTim2hTcqt8Y16m0qo7i1+4N063UEL6jkpee67wrt@mail.gmail.com>
Date: Sat, 15 Jan 2011 21:36:55 -0000
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Subject: LF: Re: Why do blown FETs always go Drain-Gate short?
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I thnk that is the highest stress area (V/um), then the device it
permanently on, so it takes a little longer to melt the silicon or fuse the
source lead or both.

Get rid of the burned epoxy smell?? Ah try zapping a selenium rectifer :-)
you wont smell the epoxy after that. It works with tantalums as well.

Alan G3NYK

----- Original Message ----- 
From: "Andy Talbot" <andy.g4jnt@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, January 15, 2011 4:53 PM
Subject: LF: Why do blown FETs always go Drain-Gate short?


> And the Source leads either melt or blow out of the packaging
>
> Guess who lowered the drive freq on his class E PA without thinking.
>
> Still...
> at least now the design is proven, and I know how easy it is it set up,
will
> order some IRFP360 devices and try for a modern higher efficiency version.
>
> How do you get rid of the smell of burnt epoxy :-(
>
> Andy
> www.g4jnt.com
>