Re: heat sink


Diver Martin <diver.martin@...>
 

The IRF510's have the tab as drain, which is the RF output.  I have two IRF530's in my amplifier design on one heatsink that is grounded, have not had any issues.  You actually sometimes want a little capacitive loading on the drains sometimes to reduce the high frequency harmonics that an amplifier like this is liable to generate.

On Sun, Dec 31, 2017 at 10:34 AM, Gordon Gibby <ggibby@...> wrote:
at the low impedance levels we're talking aobut it probably won't matter, but they each will have some capacitance to the heatsink presuming it is grounded and not floaating  (and that they are insulated)

In the picofarad range probably.

gordon
________________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of Vince Vielhaber <vev@...>
Sent: Sunday, December 31, 2017 1:21 PM
To: BITX20@groups.io
Subject: Re: [BITX20] heat sink

As long as they're insulated from the heat sink, yes.  If not, no.

Vince.


On 12/31/2017 01:20 PM, rf200655 wrote:
> Can both of finals be on same heatsink ?
>
> Thanks Ray
> KC4DYM
>

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