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Old 17th May 2014, 08:30 AM   #1
M Gregg is offline M Gregg  United Kingdom
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Default Resistors...

Thought I would post this for anyone interested,

Selecting resistors for preamp, amplifier and other high-end audio applications | EE Times

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Old 17th May 2014, 10:46 AM   #2
ishiru is offline ishiru  Indonesia
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i used standard carbon/metal film resistor for the best price
only used a few good resistors like Dale, Riken, PRP, Takman, Welwyn, etc for aesthetic

i couldn't hear the difference between them tbh (and no oscilloscope)
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Old 17th May 2014, 11:24 AM   #3
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I tend to agree, I couldn't hear any difference either.

As long as you use half decent metal film resistors.
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Old 17th May 2014, 12:22 PM   #4
AndrewT is offline AndrewT  Scotland
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I would expect that when we hear a difference then it's due to a change in the resistance (transient changes included) and/or a change in the interference.

Small, tight tolerance and low tempco avoid both of those problems.

So much so that even measurements into the PPB level cannot tell, properly specified, resistors apart when checking circuit performance.
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Old 17th May 2014, 01:03 PM   #5
ishiru is offline ishiru  Indonesia
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Quote:
Originally Posted by AndrewT View Post
I would expect that when we hear a difference then it's due to a change in the resistance (transient changes included) and/or a change in the interference.

Small, tight tolerance and low tempco avoid both of those problems.

So much so that even measurements into the PPB level cannot tell, properly specified, resistors apart when checking circuit performance.
does the "small" means the size?.and how many percent could be considered as tight tolerance?.does generic 1% metal films counted?

and i also don't understand the temperature coef of resistors
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Old 17th May 2014, 01:33 PM   #6
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Temp coef is all about how much the resistance will change with a change in operating temperature.

In a critical environment the resistor could change value significantly as it warms and cools.
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Old 17th May 2014, 03:13 PM   #7
DF96 is offline DF96  England
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Ignore the nonsense about ESL chopping up the signal, as one of the comments after the article says. That part seems intended to frighten EE-illiterate audiophiles. The rest of the article says nothing new?
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Old 18th May 2014, 12:44 AM   #8
fas42 is online now fas42  Australia
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Another interesting write-up is discussed here - Designing for Ultra-Low THD+N in Analog Circuits. Part 2 of the material has lots of good stuff ...
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Old 18th May 2014, 08:21 AM   #9
AndrewT is offline AndrewT  Scotland
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"small" is size.
To reduce aerial effects in both transmit and receive.

"tolerance" depends on duty.
Some locations would be perfectly happy and performance would not change with +-10%.
Other areas may require better than +-0.01% to achieve specified performance.

In general audio, but not including balanced impedance matching, 1%, metal film, 50ppm is good enough.
I use 1%, 600mW, 100ppm, metal film @ ~1.6pence each.
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Old 19th May 2014, 03:08 PM   #10
M Gregg is offline M Gregg  United Kingdom
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For fun..

http://www.tubecad.com/2007/12/23/Th...20Resistor.pdf

And..

http://www.vishaypg.com/docs/63517/FACTS-121.pdf

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