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What causes resistor distortion?
What causes resistor distortion?
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Old 12th January 2020, 07:52 PM   #131
jan.didden is offline jan.didden  Europe
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Thanks guys that's very useful info! I need to digest it.

Jan
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Old 13th January 2020, 04:27 AM   #132
DualTriode is offline DualTriode  United States
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Hello All,

This is the plot of the 1K Ohm CC resistors placed into the bridge with the 8 Vishay PTF65 reference resistors. The same 6.3 volt test voltage.

Thanks DT
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File Type: png 1000R CC 6.3V 1M 20AVR.png (45.6 KB, 141 views)
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Old 13th January 2020, 09:15 AM   #133
jan.didden is offline jan.didden  Europe
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Bad carbon! (And not just for climate ;-).

DT, is this a 555(B) or 525?

Jan
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Old 13th January 2020, 12:28 PM   #134
Vovk Z is offline Vovk Z  Ukraine
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Quote:
Originally Posted by jan.didden View Post
Bad carbon! (And not just for climate ;-).
- it's good warm lamp sound of music, you don't understand!
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Old 13th January 2020, 02:49 PM   #135
DualTriode is offline DualTriode  United States
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Jan,

555

DT

Edit: If you put the test bridge and unshielded balanced cable ends inside a steel box on the concrete floor the noise floor is much cleaner.

Last edited by DualTriode; 13th January 2020 at 03:01 PM.
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Old 14th January 2020, 09:21 AM   #136
N101N is offline N101N
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Electrical processes that generate low temperature heat, will also generate high audio signal distortion - in case somebody would think otherwise.

There is a widespread opinion that precision gives low audio signal distortion. This deeply entrenched misapprehension stems from control theory, where precision plays a central role in correcting simple machine motion errors, regrettably serving as the conceptual framework for audio amplifier design. From the generalization it follows that circuits and parts that do not display precision exhibit high audio signal distortion. It's unthinkable that low noise, high thermal conductivity.and precision could convey high signal distortion. For those adamantly convinced, metal film is a natural choice.

I myself distrust commonly held opinions. On the other hand, I am not the only one avoiding wire-wound, metal film and chip resistors like the black plague because of their high metallic material density, deficient frequency range and harsh sonic character. Stupid numbers and graphs do not tell you anything substantial.

Chip resistors are an amazing technological advance, like manna from heaven for the audio community. Or is it for the manufacturing industry?

Sound reinforcement systems usually suffer from significant performace limitations (incapability to reproduce nuances). In light of that, a discussion of the mild resistor distortion can appear to be pretty much academic.
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Old 14th January 2020, 09:53 AM   #137
N101N is offline N101N
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Actually for static nonlinearities and predominantly second- and third-order distortion, there are equations to estimate harmonic distortion from differential gain
The most common circuit topologies, such as the differential amplifier, do not produce any even order signal components, so by that logic, zero percent second order distortion would be closer to the truth. Halleluia.

Physically, distortion increases explosively with harmonic oder while the Fourier transform barely copes with the second and third order harmonics, above that the computational burden and fuzziness (indeterminacy) become more or less unbearable. This embarrassing functional narrowness is the reason for the representational predominance of the very benign second and third order distortion. The Fourier transform always presents pleasing results. That's why it's so popular.
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Old 14th January 2020, 11:11 AM   #138
N101N is offline N101N
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Quote:
I do not subscribe to any of the theories that have been propagated.
To which theory are you a believer?
Then you limit yourself from learning and understanding.
Unsurprisingly, it is a question of material composition / constitution. Credible, comprehensive presentations are available, no need for delusive simulation data.
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Old 14th January 2020, 12:20 PM   #139
Vovk Z is offline Vovk Z  Ukraine
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Originally Posted by N101N View Post
Electrical processes that generate low temperature heat, will also generate high audio signal distortion - in case somebody would think otherwise.
You are talking something counterintuitive on my opinion.
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Old 15th January 2020, 12:33 AM   #140
Mark Tillotson is offline Mark Tillotson
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Originally Posted by N101N View Post
I myself distrust commonly held opinions.

You mean distrusting measured factual performance. Opinion is what you have, established knowledge is what we have. Nature cannot be fooled.
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