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Re: [Amps] attaching a heat spreader to a heat sink

To: amps@contesting.com
Subject: Re: [Amps] attaching a heat spreader to a heat sink
From: Steve Thompson <g8gsq@eltac.co.uk>
Date: Thu, 24 May 2007 10:49:57 +0100
List-post: <mailto:amps@contesting.com>

Tom W8JI wrote:

> By the way, the FET's will have a tendency to blow up on 
> higher bands using Motorola's original layout.... especially 
> if you let the drain voltage exceed 55 volts. Be sure to 
> look at the drains right at the FET's with a scope and watch 
> the peak voltage!!! The boards I played with had a nasty 
> third harmonic resonance that created some pretty high 
> voltages.

Can you remember the frequency where the problem occurs?

Thanks,

Steve
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