where to get 0.1 ohm 2W 0.1% resistors? - diyAudio
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Old 24th May 2006, 07:24 PM   #1
lgreen is offline lgreen  United States
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Default where to get 0.1 ohm 2W 0.1% resistors?

Anyone know a link where can I get the 2W 0.1% 0.1 ohm resistors that are used for a parallel chipamp (BrainGT LM4780 boards)?

I'd rather pay more for .1% than try to build a circuit and match up 1% ones; also I know that you could parallel a bunch up to bring the precision up but my question is really where to get the exact part. Have checked digikey and mouser but spent so much time there without finding them (actually did see some super expensive caddock's that were 25W and to-220), i'd thought i'd ask here.
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Old 24th May 2006, 07:54 PM   #2
Bazukaz is offline Bazukaz  Lithuania
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Hi,
Do you really need 0,1% ? If it is for output paralelling resistors , i really don't think this would make any sense. The trace/solder resistance would probably be large enough to make the precision by far worse.

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Lukas.
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Old 24th May 2006, 09:04 PM   #3
Mad_K is offline Mad_K  Norway
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I agree with Lukas. 0,1% is simply absurd. 1% is more than good enough (usually they are much closer when taken from the same batch)
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Old 24th May 2006, 09:15 PM   #4
lgreen is offline lgreen  United States
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Quote:
Originally posted by Mad_K
I agree with Lukas. 0,1% is simply absurd. 1% is more than good enough (usually they are much closer when taken from the same batch)
I thought the everyone was saying .1% here? Guess not, ok, that makes it easier.
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Old 24th May 2006, 09:16 PM   #5
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What a shame.
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Old 24th May 2006, 11:22 PM   #6
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Quote:
Originally posted by jacco vermeulen
What a shame.
Nice! But that spec requires the 4 terminals - not relevant here!

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Old 24th May 2006, 11:30 PM   #7
RDV is offline RDV  United States
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I used 1% for mine and it works fine.

HTH

RDV
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Old 25th May 2006, 12:09 AM   #8
DIAR is offline DIAR  Finland
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If I need a matched pair I buy a bunch of 1% resistors, measure them and choose a pair with same resistance.
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Old 25th May 2006, 02:43 AM   #9
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Default .1% 2 to 3 watt resistors?

1% resistors are perfectly fine for parelleling.
Look at the math the 22K feed back resistor is a .1% unit 22000 - .1%=22 or a differance from 21978 to 22022 ohms.
1% 3watt resistor used for you outputs, 1.0 ohm-1%=.01ohms a differance of .99 ohms to 1.01 ohms see where I am going with this
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Old 25th May 2006, 06:27 AM   #10
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The needed tolerance level is less than 10%

If you are going to paralleling 0.1 ohms is rather little if you don't have a DC servo of otherwise trim the output offset voltage.
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