audio capacitors 1800/150 uF ?

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#122
DF96 said:
Ok, let us assume he said this and he meant it to mean what it appears to mean and there are no surrounding caveats or restrictions. In that case it is simply false. He is mistaken. A short cable within a unit from one board to another carrying an analogue audio signal does not have to be anything special: you simply need a pair of good conductors (e.g. almost any metal - or a banana) separated by a good insulator. In some cases they may need to be twisted or screened if there are local source of interference (e.g. a PSU in the same box).
If I did that and found a genuine difference then I would conclude that there was something wrong with my circuit design, such as a wrong value or poor choice of dielectric.
Yes. A short piece of wire can act as a filter for frequencies above a few GHz. As we all know, such frequencies are very relevant to audio.
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Please send an email to dan wemmer (CARY) expressing your concerns and let me know what he says - OK?
 
#123
Why should I correct someone I have never met and have nothing to do with? You quoted him; you email him. There are enough arguments on here without starting arguments with people who are not on here.

Everyone on here should be required to read the snake oil thread in the Lounge at least once a year. That would warn them that some people are ignorant, and some are greedy; which is which is less important because both are good at taking money from audiophiles.
 
#124
thedoc735 said:
"Solid polymer capacitors can be used to smooth out the voltage from a power source to a sensitive circuit, reducing power noise. In such applications, they can easily replace standard electrolytic capacitors, provided that the operating voltage is sufficiently low. They can also be used for power bypass and signal decoupling."
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This is how they catch you. ALL capacitors can be used to smooth.... . ALL capacitors can be used for power bypass and signal decoupling.
It's what caps do. 😎

Jan
 
#125
DF96 said:
Why should I correct someone I have never met and have nothing to do with? You quoted him; you email him. There are enough arguments on here without starting arguments with people who are not on here.

Everyone on here should be required to read the snake oil thread in the Lounge at least once a year. That would warn them that some people are ignorant, and some are greedy; which is which is less important because both are good at taking money from audiophiles.
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I thinks it's better to buy some participation in Mouser capital than buying them caps 😀
 
#131
thedoc735 said:
Because you are the one who says he is wrong and contacting him would allow him to explain his comment in more detail, and may even persuade you otherwise?
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You brought a quote from him into this discussion, apparently because you felt that his opinion trumped physics. I don't say he is wrong; physics says he is wrong; I am merely reporting what physics says. More detail is not needed. For any false statement in electronics it is possible to find someone who says it, but that does not prove that it is true.

The statement does not say: "ALL caps can't be used to smooth, bypass, decouple"; it simply says to those who are learning that polymer may also be used as well as other types.
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Polymer caps would be fairly useless if appropriate values could not be used for normal circuit purposes, so it is a strange claim to make. Like someone inventing a new resistor material and proudly proclaiming "this resistor can be used to bias a BJT or act as an anode load" - it would be more news-worthy if the new resistor could not be used for these purposes.
 
#133
DF96 said:
Polymer caps would be fairly useless if appropriate values could not be used for normal circuit purposes, so it is a strange claim to make. Like someone inventing a new resistor material and proudly proclaiming "this resistor can be used to bias a BJT or act as an anode load" - it would be more news-worthy if the new resistor could not be used for these purposes.
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jan.didden said:
This is how they catch you. ALL capacitors can be used to smooth.... . ALL capacitors can be used for power bypass and signal decoupling.
It's what caps do. 😎

Jan
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#134
Eldam said:
+1
(I mean page)
Achtung : polymer caps may give a Strange result sometimes in an analog circuit !
But better thousands pages, the best is you are doing your test and report where it's driving you.
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Anyway, using datasheet info (not based on cost or audio grade) because I can't afford the time, energy & cost of buying every single cap out there that happens to fit the parameters, I have decided on the following caps to give 'a go':

....based on what eldam said about polymers I have made alternative selection, but this time I have allowed the 'drill down' to select maximum VDC from 35v upwards (35v being the lower limit) so it now looks like this:

EEU-FM1V471B (keep)
EEU-FM1V102
UHW1V182MHD6
63SXE33M
EEU-FM1H151

...these are based on things like: voltage, uF, ESR, ripple, size, longevity, termination, temp., tolerance, Q factor, tang, leakage, DF, 'and the like'.
 
#138
thedoc735 said:
The statement does not say: "ALL caps can't be used to smooth, bypass, decouple"; it simply says to those who are learning that polymer may also be used as well as other types.
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Yes but the statement implies that these polymers are particularly good at it. They don´t say it but, following the true and tested method, imply it. Your comment in this tread indicate they have been quite successful.

The statement is nonsense, ANY cap can be used for those purposes, it is nonsensical to say it specifically for polymers.

Like a truck manufacturer stating our trucks can be used for many purposes, hailing cargo, transporting containers, you name it. Implying that this is a specific quality of their trucks. Yet, people ´in the know´ know that ALL truck can be used this way. So the statement doesn´t say anything about the quality or fitness for purpose of these trucks in comparison to other trucks.

Jan
 
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#139
I remember once being sold a pension policy. One of the sales features was the 'open market' option, which meant that on maturity I could take the accumulated pot of money and use it to buy an annuity from another insurance company if they were offering a better deal than the one I had saved with. I later discovered that the 'open market' option was a statutory requirement, so every pension sold by everyone had to include it. This is how sales people mislead by telling the truth, but not the whole truth.
 
#140
jan.didden said:
Yes but the statement implies that these polymers are particularly good at it. They don´t say it but, following the true and tested method, imply it. Your comment in this tread indicate they have been quite successful.

The statement is nonsense, ANY cap can be used for those purposes, it is nonsensical to say it specifically for polymers.

Like a truck manufacturer stating our trucks can be used for many purposes, hailing cargo, transporting containers, you name it. Implying that this is a specific quality of their trucks. Yet, people ´in the know´ know that ALL truck can be used this way. So the statement doesn´t say anything about the quality or fitness for purpose of these trucks in comparison to other trucks.

Jan
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weak argument in my opinion.
 
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