[Amps] 47 Ohm 5 watt
km1h at jeremy.qozzy.com
Sun Aug 12 14:34:28 EDT 2018
You dont need 5W.
Just BUY a pair of Ohmite 47 Ohm 2W OY series from Mouser as others do.
They have no minimum and if you call in the order ask for USPS First Class
Mail so you dont get hit with a $8+ UPS minimum.
----- Original Message -----
From: "Joe" <nss at mwt.net>
To: "Bryan Swadener" <bswadener at yahoo.com>; <amps at contesting.com>
Sent: Saturday, August 11, 2018 12:46 PM
Subject: Re: [Amps] 47 Ohm 5 watt
> Yeah temp would be an issue, these will be replacing these in a SB-220
> The Original Rolling Ball Clock
> Idle Tyme
> On 8/9/2018 12:54 PM, Bryan Swadener via Amps wrote:
>> 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
>> (http://www.ebay.com/itm/400003772794). Add $3.50/order shipping to USA.
>> vy 73, Bryan WA7PRC
>> Date: Wed, 08 Aug 2018 16:50:37 +0000
>> From: Manfred Mornhinweg <manfred at ludens.cl>
>> To: amps at contesting.com
>> Subject: Re: [Amps] 47 Ohm 5 watt
>>> I hope someone has in their parts box. (2) 5 Watt 47 ohm non inductive
>> 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.
>> Visit my hobby homepage!
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