heat sink for 25W zener

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Hi,

What type/model of heat sink do I need to use for a 25W power zener diode? (which has a threaded stud)

I was thinking of using an aluminium bar 10mm x 10mm (with a threaded hole for the stud) which is bolt in to a 4mm aluminium chassis.


Cheers,
Ced.
 
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