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-   -   What are the sonic differences between various type of SMD resistors?? (https://www.diyaudio.com/forums/parts/360239-sonic-differences-various-type-smd-resistors.html)

astouffer 16th September 2020 08:18 PM

Quote:

Originally Posted by SemperFi (https://www.diyaudio.com/forums/parts/360239-sonic-differences-various-type-smd-resistors-post6343228.html#post6343228)
I am actually not in disfavor of possible variances due to types of resistors. The smaller they get, the more their tempcos will start to effect their actual resistance, since the voltage levels mostly stay the same in audio. The current density also can get to a point where excess noise starts to be a factor. But at those voltage swings the music should be so loud that the excess noise only a tiny speck in the mix, totally inaudible.
I do find the subject interesting tho if only to have the possible option of getting a dB or so better NF or distortion, but not so much because I think I can hear it.

We ran into this at my old job. A board used 0402 resistors and you could watch signals drift as everything heated up. Finally someone looked at the temp co rating of 0402 parts and it all made sense.

billshurv 16th September 2020 10:52 PM

There are always applications where the right resistor matters. I was regailed with a story recently of a bulk foil required to sort out an ATE rig that was giving the wrong answers. But that was simple engineering. Likelywise the link to Susy's MELF experiments. Feedback resistors dissipate power and it's textbook stuff.



A load resistor that may only see 5-10mV across it? And whose purpose (for MC stages) is only to deal with ultrasonic ringing I have more of an issue with. For DIY 'it was only 50c' is of course a valid answer.

coresta 17th September 2020 11:15 PM

Quote:

Originally Posted by Indiglo (https://www.diyaudio.com/forums/parts/360239-sonic-differences-various-type-smd-resistors-post6342843.html#post6342843)
There are no sonic differences. It's audiophile mythology.

change your amps, your resistors, ... your ears ? :)

disfunctionalshadow 18th September 2020 01:40 AM

Perhaps in certain designs - like the AKSA-Lender, the type of resistor matters.
They show how the distortion spectrum changes - metal film feedback resistor
makes the 2nd harmonic less then the third.

Carbon film, as the feedback resistor, causes the 3rd harmonic to be less than the 2nd harmonic.

See the results of the measurements here.

escksu 18th September 2020 09:30 AM

Quote:

Originally Posted by billshurv (https://www.diyaudio.com/forums/parts/360239-sonic-differences-various-type-smd-resistors-post6343158.html#post6343158)
Why use high power handling resistors for microwatt levels?

IMHO, its the consistency. A high power resistor is less susceptible to changes and less likely to heat up.

billshurv 18th September 2020 09:46 AM

Quote:

Originally Posted by disfunctionalshadow (https://www.diyaudio.com/forums/parts/360239-sonic-differences-various-type-smd-resistors-post6345038.html#post6345038)
They show how the distortion spectrum changes - metal film feedback resistor
makes the 2nd harmonic less then the third.
.

That's basic textbook engineering again. The feedback resistor cannot be corrected by the feedback loop, and can dissipate significant power. It's possibly the most critical component to thing about.


Quote:

Originally Posted by escksu (https://www.diyaudio.com/forums/parts/360239-sonic-differences-various-type-smd-resistors-post6345323.html#post6345323)
IMHO, its the consistency. A high power resistor is less susceptible to changes and less likely to heat up.


with 1mV across it? I asked a specific question on a specific application.

dreamth 18th September 2020 10:25 AM

Which textbook is saying that?All the electric components inside the feedback loop bennefit of feedback correction, including the feedback resistor.What i really doubt is that resistors can produce any distortions at all in the audio range...

billshurv 18th September 2020 10:34 AM

You need to think about the problem a bit more before you make comments like that.

Mark Whitney 18th September 2020 11:48 AM

Think about what happens when the feedback loop is a filter, which it nearly always is.

dreamth 18th September 2020 02:11 PM

Quote:

Originally Posted by billshurv (https://www.diyaudio.com/forums/parts/360239-sonic-differences-various-type-smd-resistors-post6345372.html#post6345372)
You need to think about the problem a bit more before you make comments like that.

I just asked what textbook is saying that...You didn't provide any.You just want to show off with some misterious knowledge that there isn't nowhere to be found. It's not the first time you do it either.

And i did think about that...you are completely and utterly wrong. The resistor itself is in the feedback loop . You cannot compare the distortions introduced by two different resistors in the audio band unless they are high value and one is wirewound.It's a very simple logic to back this and no phylosophical misterious concept can destroy it.


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