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Old 30th November 2008, 08:12 PM   #1
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Default Help with capacitor markings (pic attached)

Hi all, I've got two MTX class D amp's that I'm going to attempt to repair.

I'm having some time trying to identify a few capacitors.

I'm not sure if the 7 is a 7 or some type of company logo.

Several of their markings from the tops:
7 1N0J 100
7 100NJ100


Figured a picture may help.

Click the image to open in full size.
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Old 30th November 2008, 08:24 PM   #2
Netlist is offline Netlist  Belgium
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You are looking at a 100nF (NanoFarad) 100V capacitor.
The '7' is most likely not a seven but a logo.

/Hugo
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Old 1st December 2008, 05:13 AM   #3
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Thanks for the reply!

100n makes sense for 100 nano farad.

Some googling leads me to believe the J is the tolerance? 5%

Following that convention, I'm still stumped by 1N0J. Is the zero some sort of multiplier making the 1 mean one nanofarad?

Here is one of my search results, not sure if I'm going in the right direction or not.
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Old 1st December 2008, 05:43 AM   #4
es44 is offline es44  Denmark
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Look at the "n" as a dot, or expressed another way: If it had said 1n5, then it would have been a 1.5 nF capacitor. Continue down that line if you please... 2n2, 4n7 etc.

Best regards
Ebbe
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Old 1st December 2008, 05:45 AM   #5
poynton is offline poynton  United Kingdom
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The '7' looks more like an italic 'T'

Another photo may help.

Andy
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Old 1st December 2008, 06:46 AM   #6
Netlist is offline Netlist  Belgium
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Scoob,

Every type - film, ceramic, electrolytic, SMD - has his own code or standard to mark the parts.

Look here and you'll find out more about it.
The J is indeed 5%.
Your 1N0 would be 1nF to me. In doubt, I always measure.

/Hugo
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Old 1st December 2008, 02:29 PM   #7
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Much thanks.

Before I posted I did find one site that referred to the N as the decimal, but what threw me off was they would put a trailing zero on a 1nf and not the 100nf.

I think I've got my parts list all figured out and ready to order.

Thanks again
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Old 1st December 2008, 02:42 PM   #8
es44 is offline es44  Denmark
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Quote:
Originally posted by scoob8000

Before I posted I did find one site that referred to the N as the decimal, but what threw me off was they would put a trailing zero on a 1nf and not the 100nf.
Thanks again
That's because you won't see a 100.5nF capacitor, that way of marking capacitors first starts at <10nF.( at least the ones i've seen ), after 10n there's no use for a decimal.

You're right, it's a jungle out there

Best regards
Ebbe
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Old 18th December 2008, 07:55 PM   #9
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Why do I keep getting stumped on this.. Here's another one..

.047K100

Is that .047 nanofarads or .047 picofarads?

I get the K100 (10%, 100 volt)

Click the image to open in full size.
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Old 19th December 2008, 04:54 AM   #10
es44 is offline es44  Denmark
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Quote:
Originally posted by scoob8000
Why do I keep getting stumped on this.. Here's another one..

.047K100

Is that .047 nanofarads or .047 picofarads?

I get the K100 (10%, 100 volt)

That's a 0.047uF, or 47nF.

Best regards
Ebbe
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