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Old 27th May 2008, 11:55 PM   #1
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Default Please help with polarized capacitor!

I am building this design: http://www.vikash.info/audio/p2plm3886/

The CS capacitor that I have is a polyurethane axial cap with one line on one side which means, as I understand, that it is polarized one. On the other hand the diagram assumes that a non-polarized MKT type will be used, so it does not specify which way to put it.

Is it cap + with chip + and cap - with chip - or the other way around?

Thanks very much

Antonio
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Old 28th May 2008, 07:35 AM   #2
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I have never seen a polarized 300pf before, but i dont know anybody else have maybe.

if it is a polarised, then + cap should to + chip. IMHO.
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Old 28th May 2008, 07:54 AM   #3
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It's interesting that there has been only one answer (Thanks Casiomax)

I'm sorry if my question is too obvious Or is it not?

This is the cap:

http://uk.farnell.com/jsp/search/pro...sp?SKU=9520740

There you can see the band/line towards one side of it. If the line means there is polarity, which side would be the +

The datasheet does not mention whether it is non-polar or not. I'm going to call the manufacturer later today.

Any more comments would be appreciated.

Antonio
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Old 28th May 2008, 07:59 AM   #4
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I beleive that was a polystyrene cap, not an electrolytics. On the schematics usually an electroytic cap will have a + marking, the 300pf does not have, so you should use a non electroytic cap.
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Old 28th May 2008, 08:01 AM   #5
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It is non-polar.
It is usually common that the "outer" foil is the one connected to the striped lead.
It was once suggested that the outer foil is connected to the lower-impedance side of the circuit,to give a sort of shielding effect.
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Old 28th May 2008, 08:06 AM   #6
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Polarized caps have values over 4.7 uF in general. You can find lower values but they are rather uncommon these days.
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Old 30th May 2008, 08:41 AM   #7
glennb is offline glennb  Australia
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Quote:
Originally posted by DigitalJunkie
It is non-polar. It is usually common that the "outer" foil is the one connected to the striped lead.
It was once suggested that the outer foil is connected to the lower-impedance side of the circuit,to give a sort of shielding effect.
Correct on both counts.
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Old 30th May 2008, 10:01 AM   #8
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Thanks very much for your help. The cap is now installed and the amp is working perfectly.

By the way. Are these type of caps a good choice for audio? I read somewhere that they are but I would like to know the forum's opinion.

The reason I'm using it is just because I could not find an MKT one with the same specs to use as Cs in this schematics.

http://www.vikash.info/audio/p2plm3886/

Regards

Antonio


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Old 30th May 2008, 02:16 PM   #9
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Its a matter of different sound IMHO. different caps have different result, what sound better to you might not be to others. but does not hurt to try different types of cap.

I dont know about others experience, but does it?
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Old 30th May 2008, 02:26 PM   #10
AndrewT is offline AndrewT  Scotland
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replacing the 3u3F MKT with an electrolytic will not achieve the same thing as was intended in the PSU schematic you posted.
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