Precision resistors

[carlmart]

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

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


Carlos

[leadbelly]

The Vishay/Dale at Mouser are pretty cheap.

[Nuuk]

Welwyn RC55 (from Farnell).

[Upupa Epops]

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 " ?

[AndrewT]

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.

[carlmart]

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?

[Cortez]

Originally posted by Nuuk
Welwyn RC55 (from Farnell).

But its magnetisable, if i'am right.

[Upupa Epops]

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....

[carlmart]

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.

[Upupa Epops]

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...