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Old 1st March 2006, 05:31 PM   #1
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Default Precision resistors

What's the best deal now for 0.1% resistors?

What are you people using on gainclones that need that precision?


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Old 1st March 2006, 05:38 PM   #2
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The Vishay/Dale at Mouser are pretty cheap.
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Old 2nd March 2006, 09:36 AM   #3
Nuuk is offline Nuuk  United Kingdom
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Welwyn RC55 (from Farnell).
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Old 2nd March 2006, 10:22 AM   #4
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For what do you need 0.1 % resistors ? Normal 1 % ones give ( if they are used in feedback loop ) difference of gain bellow 0.1 dB... Are they only for " good feeling " ?
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Old 2nd March 2006, 10:41 AM   #5
AndrewT is online now AndrewT  Scotland
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Hi,
0.1% tolerance is normally reserved for super matching eg. multipole active filters, test instruments, or where another characteristic follows from that super spec eg. temperature coef.

1% are very cheap now and do for almost all nomal audio uses. but even 5% are acceptable in many locations.
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Old 2nd March 2006, 11:08 AM   #6
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Default Why 0.1% precision?

To name just a few applications for these chips that demand 0.1% resistors are Mauro Penasa's Ref design and when you want to bridge and/or parallel gainclones, like National itself puts on their application notes.

Of course you can match resistors to get very close to that value, but prices are going down on 0.1% parts, so why bother?
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Old 2nd March 2006, 11:27 AM   #7
Cortez is offline Cortez  Hungary
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Quote:
Originally posted by Nuuk
Welwyn RC55 (from Farnell).
But its magnetisable, if i'am right.
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Old 2nd March 2006, 11:28 AM   #8
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Nobody will hear difference between both value, in normal mode and in parallel or bridge too... but yes, price is low, so why not...good feeling is good feeling....
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Old 2nd March 2006, 01:06 PM   #9
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I am not sure it's just a "good feeling" question. Pairing resistors in large quantities to such low precision can be cumbersome and expensive (in parts and time).

If a design requires 0.1% precision, I don't see how you can get away with less accuracy.
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Old 2nd March 2006, 01:30 PM   #10
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0.1 % resistors you need for fifth order filter for example ( as wrote Andrew ) - in other connection it is unnecessary.... more interesting is thermal coefficient...
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