Nope, it just has to be trimmed out in most cases with a trimpot. It's mostly a DC offset issue. Even if there's an AC signal being measured, the harmonic distortion from a temperature sensor or whatever isn't likely to be an issue.
Not talking about temp sensors, more precision analogue circuitry say for a phase array radar or high precision ADCs, where there are no trimpots...
Basically what is being said is resistors are directional!
Basically what is being said is resistors are directional!
Actually I tried this on my bridge.
With a metal film 1M resistor there was no difference. I had 820K in a carbon film 1/4W unit.
Measuring it one way and then taking it out and reversing it did change the 5th digit. However this all seemed to be a thermal effect from the heat of my finger tips, as it slowly would come back to the same value. So I was unable to confirm any direction issues on my samples.
With a metal film 1M resistor there was no difference. I had 820K in a carbon film 1/4W unit.
Measuring it one way and then taking it out and reversing it did change the 5th digit. However this all seemed to be a thermal effect from the heat of my finger tips, as it slowly would come back to the same value. So I was unable to confirm any direction issues on my samples.
+1 exactly what i said ! And thermal expansion of the resistor make these semi-conductive effects fluctuating with signal modulation ....I have found that resistor quality can matter, in certain locations! The hard part is identifying where.
I wish it didn't, mainly on cost grounds but as so often in life, small improvements can cost big.
I wish it didn't, mainly on cost grounds but as so often in life, small improvements can cost big.
Yup, this is another likely mechanism, and microphonics could also be involved in modulating the end-cap contact resistance. In the old days of cat's whisker point-contact detectors, they were very sensitive to the pressure applied to the contact.
Where are some articles on this from mainstream electronics! Any proof or just more idle speculation, because the resistor would have to be very sensitive to temp changes for this to be noticeable, and with the thermal mass of a resistor you are not going to hear this.
Then there is post #598.
This sounds like a load of bull**** and more Audiophile foolery....
And if PTH resistors are so bad use SMD!
Why is audio (allegedly) sensitive to effects which are not seen in much more demanding applications such as medical, instrumentation, military, telecommunications etc.? Everyone else builds their electronics on the assumption that resistors are essentially resistive (apart from some well understood reactive parasitics), and finds that this assumption is close enough for all practical purposes. Exceptions are carbon composition, which are known to be nonlinear and unreliable - yet are favoured by some audiophiles!
Could it be that "audiophiles" like the sound effects of added low order distortions?
And by solely using their ears have no idea what "High Fidelity" can achieve.
And by solely using their ears have no idea what "High Fidelity" can achieve.
It is probably the only area of electronics I know where you get people modding boards etc. who have no idea or a very very basic understanding of electronics. Then there is the Guru factor, where someone comes up with the electronic equivalent of some new clothes for the emperor and a whole herd of devotees will follow, proclaiming it as the best improvement in sound quality, with no empirical data to back anything up.
YES! I have deliberately used carbon comp resistors in an attempt to tame a systems sound, it worked but I couldn't put up with the loss of fine detail.
No one buys a scope then decides to start replacing components to see if it does anything differently. A signal trace looks much the same on a cheap scope as it does on an expensive one, the expensive one (might) be more accurate though. Audio is no different, more outlay SHOULD buy performance gains by reducing compromises.
However blindly replacing components with expensive ones is just plain daft.
However blindly replacing components with expensive ones is just plain daft.
Much more demanding in what way? Reproducing music is not the same discipline as dogmatically linearizing a circuit. Approaching audio this way will probably shave away hairline waveforms that are meant to be there (ie:the same way an MP3 down samples). What most people fail to consider when describing the "low bandwidth simplicity" of audio is the complexity of the simultaneous waveforms with their various comparative levels having to be reproduced in the correct time envelope. It sounds like you fall into this category of dogmatic linearizers. Outside of those with a financial interest in the hospital, I don't know anyone who enjoys the sound of an EKG beep.DF96 said:
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Yes audio is the cutting edge of electronics....🙄
You want to have a look around at what is being developed and worked on...
As to linear, isn't that one of the goals of audio....
Now now, I never said it was the cutting edge of electronics but it's a bit more challenging than just working in low bandwidth, right? I'm just really tired of the dismissive attitude directed toward audio designers by people trained in different (more advanced 🙄) disciplines.
The idea is that the signal fed from the Power Amplifier to the speaker is a scaled version of the Signal fed from the Audio Source to the Power Amplifier.
Nothing added and nothing of the wanted signal removed.
Nothing added and nothing of the wanted signal removed.
I don't think there is a dismissive attitude to analogue designers or digital designers (audio design covers both these days), it is the fringe element that gets the flac, quite often deservedly. proper design problems, ideas improvements are supported, it is the way out ideas such as rectification in resistors that distracts from real problems with audio design.....
I agree with Andrew T, the chain of electronics should add very little to the signal from source to speaker.
I agree with Andrew T, the chain of electronics should add very little to the signal from source to speaker.
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