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Old 19th April 2007, 09:21 PM   #1
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Unhappy .1% resistors

is there a more selective source for precision .1% resistors than digikey and mouser that will sell 10 or 20 units. is the metal film the best choice for nationals 3886 gainclone. need help here i do not need 1000 resistors!!!!!
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Old 19th April 2007, 09:37 PM   #2
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Why do you need 0.1% precision? If you buy a few normal 1% types off the same line they tend to be quite close anyway.
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Old 19th April 2007, 09:58 PM   #3
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I always buy the 200 pc bags from Digikey for about $8. If I need to select, it's easy to sort out a bunch of matched parts to whatever tolerence I need, sometimes way beyond .1%. I can't stand to pay the much higher price for smaller quantities.
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Old 19th April 2007, 10:26 PM   #4
phn is offline phn  Sweden
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Are the 3886s you have matched within 0.1%? If not, then you probably shouldn't worry too much about the resistors.
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Old 20th April 2007, 01:08 AM   #5
scottw is offline scottw  United States
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If you are doing a parallel or bridged-parallel amp then the 0.1% are necessary-see National Semi's AN-1192 (application note). If you are just doing a single chip per channel then they're not required.

If you need small quantities of 0.1% you can try Parts Connexion; look for the "Draloric" resistors across the bottom of the page:

http://www.partsconnexion.com/catalog/resistors.html


These come in 0.1, 0.25 and 0.5%.


Scott
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Old 20th April 2007, 02:27 AM   #6
dfdye is offline dfdye  United States
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Quote:
Originally posted by phn
Are the 3886s you have matched within 0.1%? If not, then you probably shouldn't worry too much about the resistors.
As Scott said, it definitely depends on the application. Based on what I have seen, the margins on the LM3886's are well past 0.1%, making B/P applications require the higher precision matching required for those applications to work well.

If you have some chips that are off greater than 0.1%, I for one, would love to hear about it. And then I am sure National would love to hear about it so that they can get you are genuine part or a replacement for a bum chip.


PS, I concur with the crowd that you should buy a bag of standard 1% resistors and match parts yourself. Within a batch, they are typically quite close to each other. Well within 0.1% typically. For the few parts you will need, you should be able to do this within a few minutes.
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