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Re: [Amps] 47 Ohm 5 watt

To: "" <>
Subject: Re: [Amps] 47 Ohm 5 watt
From: Bryan Swadener via Amps <>
Reply-to: Bryan Swadener <>
Date: Thu, 9 Aug 2018 17:54:11 +0000 (UTC)
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Be careful of the temperature derating. The datasheet says they start to derate 
at 25°C and derate to zero at 155°C. Caddock and others produce similar power 
resistors.  Kanthal/Globar produces suitable single units but, I've not heard 
of a source for small quantities.  However, a coupla 100Ω/2W carbon composition 
resistors can be used in parallel. Ebay seller 'bigsmythe74' has new old stock 
Allen-Bradley but, he wants $4/each. Sorting by price, I see he has 91Ω/2W 
available for $1.25 each ( Add 
$3.50/order shipping to USA.
vy 73,  Bryan WA7PRC 


Date: Wed, 08 Aug 2018 16:50:37 +0000
From: Manfred Mornhinweg <>
Subject: Re: [Amps] 47 Ohm 5 watt


> I hope someone has in their parts box. (2) 5 Watt 47 ohm non inductive 
> resistors.

Actually I do have a few, apparently metal oxide, but shipping them to 
you would cost more and take much longer than if you buy them...

Maybe you can use this one:

It's 10W, but still small enough and not too expensive. You can either 
bolt it to the chassis, or on a little aluminium sheet that acts as 
heatsink, shaped and bent to fit the space you have. These resistors 
have lower inductance than old-style "non-inductive" ones, due to their 
smaller size. Of course you destroy that advantage if you have to use 
long wires to connect them...

Or you can assemble them from several 2W film resistors of properly 
chosen values, combined in parallel. Those are very common and 
inexpensive. Or use a bunch of even smaller resistors.


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