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Power Amp's NP capacitors and BP capacitors confuse ??
Power Amp's NP capacitors and BP capacitors confuse ??
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Old 1st July 2016, 02:24 AM   #1
shehantha is offline shehantha
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Default Power Amp's NP capacitors and BP capacitors confuse ??

Hi,

I am really confused about non-polar ELECTROLYTIC caps and bi-polar ELECTROLYTIC caps.

I am not asking about the difference between square type AC capacitors which use for motors and fans and normal electrolytic bi polar caps . ( I know those ac caps are non-polar. )

even when type on google '' what is the different between bi-polar and non-polar '' that gives the result of square type non-polar caps and electrolytic bi polar caps .

actually i need to know , is electrolytic non-polar and electrolytic bi-polar same ?
pls refer the attached pictures.

some says that we can easily make bp caps by soldering two normal electrolytic caps negatives together.

but in the market np electrostatics are available. but bp electrolytic caps are really difficult to find.

So if both same instead of making can i simply use non polar electrolytic caps instead of bi-polar electrolytic caps.

because my schematic says use 4.7/25v bi-polar caps.
Attached Images
File Type: jpeg np.jpeg (3.2 KB, 172 views)
File Type: jpeg bp.jpeg (5.1 KB, 171 views)

Last edited by shehantha; 1st July 2016 at 02:32 AM.
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Old 1st July 2016, 02:37 AM   #2
Dave Zan is offline Dave Zan  Australia
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Quote:
Originally Posted by shehantha View Post
[/B]actually i need to know , is electrolytic non-polar and electrolytic bi-polar same ?[B]
Yes.

Best wishes
David
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Old 1st July 2016, 02:38 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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I would have said none polar and bi-polar are the same.

If I remember correctly the reverse biased electrolytic will act like a short above about 1.5 volts.
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Old 1st July 2016, 03:12 AM   #4
shehantha is offline shehantha
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Thanks for the reply Mr.Dave and nigelwright7557 ,

appreciated your support. But need to ask onething,

is non polar and bi polar ( electrolytic ) same, then why the manufactures mention as ( NP ) and ( BP ) .
if same, they can simply mention either NP or BP on the body of cap.
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Old 1st July 2016, 04:29 AM   #5
tomchr is online now tomchr  Canada
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Bipolar (BP) = Not Polarized (NP).

Tom
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Old 1st July 2016, 09:47 AM   #6
DF96 is offline DF96  England
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I have never heard of a non-polar electrolytic. All electrolytics are polar or bi-polar. Non-polar caps are film caps, ceramics etc. It is creating confusion if one manufacturer is now saying 'non-polar' when he actually means 'bi-polar'.
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Old 1st July 2016, 09:05 PM   #7
Ian Finch is online now Ian Finch  Australia
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I have read references here, incidentally from US members, that NP caps - typically only available in values suiting signal AC coupling - are differently constructed to the common Bipolar types used in crossover networks etc. I understand that there is a fundamental difference in that both electrodes are coated with an alumina deposit rather than just one so there are in effect 2 anode foils. This renders them inherently non-polarized rather than the pseudo depolarizing effect of assembling 2 polarized caps back to back. It may amount to the same thing electrically, but they aren't simply 2 caps.

Many Asian manufacturers label their bipolar caps BP or NP without distinction and I think we are accustomed to their freewheeling attitude to language and labelling subtleties in definitions, specifications, markings, quality issues and there is a need to be careful in the interpretation. I have no idea about any conditions applying to the use of allegedly true NP caps, their ratings etc. and I'd be happier if those with the experience would support this, or not, since reliable information is scarce.
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Old 2nd July 2016, 03:05 AM   #8
Enzo is offline Enzo  United States
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In a practical sense, either one means there is no positive and negative end on the part. The distinction of the two might mean something at an engineering level or a philosophical level, but to a technician in the field, it means there is no overt polarity to concern with.

When your schematic says bipolar or nonpolar, it means that in that circuit, the voltage across the cap will not always be with one polarity, so you would not want to use a polarized electrolytic or tantalum type.
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Old 2nd July 2016, 03:36 AM   #9
tomchr is online now tomchr  Canada
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Quote:
Originally Posted by DF96 View Post
I have never heard of a non-polar electrolytic.
Have a look at the Nichicon Muse ES series. I don't know about their internal construction or which chemistry they use, but for all intents and purposes, they don't have a polarity that the outside world needs to care about.

Tom
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Old 2nd July 2016, 05:00 AM   #10
Dave Zan is offline Dave Zan  Australia
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Originally Posted by Ian Finch View Post
I have read references here, incidentally from US members, that NP caps - typically only available in values suiting signal AC coupling - are differently constructed to the common Bipolar types used in crossover networks etc. I understand that there is a fundamental difference in that both electrodes are coated with an alumina deposit rather than just one so there are in effect 2 anode foils.
Hi Ian
You are essentially correct about how non-polarized electrolytic capacitors are made, with a different foil anodization.
However the non polars electrolytics used in crossover networks are basically the same as any other, AFAIK.
There may be some "audiophile" flake who sells back-to-back electrolytics but I am not aware of any, yet.
So we probably should use "non-polar " and keep "bi-polar" for back-to-back or anti-parallel polar capacitors.
But manufacturers use the two terms arbitrarily I believe.

Best wishes
David
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