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TPA3116 2.1 board input voltage capacitor advice
TPA3116 2.1 board input voltage capacitor advice
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Old 18th May 2018, 05:48 PM   #1
Think is offline Think  Netherlands
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TPA3116 2.1 board input voltage capacitor advice
Question TPA3116 2.1 board input voltage capacitor advice

Welcome reader,

I'm looking for replacement caps for my 2 TPA3116 2.1 50Wx2+100W Amplifier Board's as one 1 board the big cap's head is bulging out.

The current cap reads Nichicon 6800uF 35V VZ(M) and is fake because it's to small to be real. It measures about 37x17mm. (real 40x20mm).
It would be an aluminium electrolytic cap for wide temperature range.

Putting in a real one will be a sqeeze, but putting in 2 in vertical position is also possible as the board has holes for them and would be an advantage over 1 big one.

After reading some bit about caps I think low esr cap's would be best to use, is this true?

As a replacement I've found these 2pcs 4200uF 35V JAMICON WG 18X45mm 35V4200uF Low ESR Long Life Capacitor 1 or 2 will fit my board if mounted vertically.

Any better options?

Some advice please!
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Old 18th May 2018, 06:10 PM   #2
FauxFrench is offline FauxFrench  France
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I agree with you, two in parallel offer better ESR than only one (same type) because also the ESR will be in parallel. This is a class D amplifier with a high frequency carrier frequency and accordingly a high frequency component in the current consumption. As I am not sure other (smaller) decoupling capacitors are included to take up the high frequency current ripple, I would also use low ESR types.
The ones you suggest are probably fine.

A small remark: I believe electrolytic capacitors are frequently specified with maximum dimension such that they may be smaller if the production technology allows a more compact outline. Evidently, the lead distance has to remain correct. So fake or not, difficult to say. But, the bulging is no good sign.

Last edited by FauxFrench; 18th May 2018 at 06:17 PM.
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Old 19th May 2018, 01:24 AM   #3
Think is offline Think  Netherlands
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TPA3116 2.1 board input voltage capacitor advice
Thank you.
I suspect the current 6800uF cap to be one like this ($1), but it's black with white and says Nichicon. The rest of the text, looks and size is the same.
The current cap is rated @35v and I have used it at max 24V for a few months now, so it should not have died. Fake or not, the replacement will be 2 low esr/impedence caps.

Is there much difference in brands?
I allready linked the Jamicon 2x 4200uF 2 for $4
3300uf rubicon 3 for $6
3000uF ELNA 6 for $5 and the same ones in 5600uF or 6500uF are 2 for $6

The Elna's have the best size; would I get an $4 worth of improvement by placing 2 caps with higher capacitance vs 2x 3000uF? (3 times the price)

Lead distance (length) will be a bit shorter with 1 or 2 caps vertically vs 1 (bigger) placed horizontally as the leads stick out of the board for about 10mm.
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Old 19th May 2018, 04:19 AM   #4
FauxFrench is offline FauxFrench  France
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The capacitor you show from Ebay is what I typically use and have good experience with. On a forum I read that a lot is produced under the name "Nichicon" but not all are equally good. Perhaps, there are more manufacturers behind the name Nichicon. Low ESR is a subjective parameter. Anyway, your capacitor should not have died after short use at 24V. You better change them both.
I once bought low ESR capacitors from another Asian brand. 25V rating. Short time of use at 24V made two explode. Two means, at least that production batch was flawed. OK, the capacitors were cheap and I used them for 12V purposes where they seem to work fine.

If you buy capacitors from Elna or Philips you are much more certain that they will stand the specs. Asia can produce good capacitors, you are just not sure which ones are good. It is a matter of brand control and price.

Which to choose for your present amplifiers? My experience with Asian capacitors is most of them work to my satisfaction. You need not use Elna all the time. For power supplies I build to be used with different amplifiers in the future, I sometimes use Elna to have less doubt about their performance. For amplifiers I make as experiments and use for up to a couple of years, I am not prepared to pay Elna prices. The amplifier was cheap to make as another experiment and why make it more expensive with Elna capacitors? I do not believe you can unambigously hear if the decoupling capacitors are Elna or not.

Last edited by FauxFrench; 19th May 2018 at 04:25 AM.
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Old 19th May 2018, 05:28 PM   #5
Think is offline Think  Netherlands
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TPA3116 2.1 board input voltage capacitor advice
Quote:
Originally Posted by FauxFrench View Post
The capacitor you show from Ebay is what I typically use and have good experience with. ........
Which one of the 3?

Most important for me is that they work longer then the current one :P
Prices to replace them per board are:
1x noname 6800uF for $1.15 or 2 smaller ones are about the same price.
2x Elna 3000uF for $1.70
2x 4200uF Jamicon for $4
2x Elna 5600/6500uF for $6
As I really like these amps and use them almost daily, they are well worth the mayor investment in some brand caps.
My guestimate is that the Elna 2x3000uF already are a big upgrade and will be fine but how much better are bigger ones and is bigger really better/noticeable here? Can they be to big and have bigger caps downsides other then space and cost?

I looked in the tpa3116 specsheets but there is no sizing info for these caps. My other tpa3116 (single chip) boards have single Rubicon 25V 3300uF or single United Chemi-Con 35V 1000uF caps. The latter one is probably a bit small and can get an upgrade as well.
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Old 19th May 2018, 08:11 PM   #6
FauxFrench is offline FauxFrench  France
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The ones I often use are the Nichicon green-gold type. No bad experiences. I believe when I earlier followed your link on the word "fake", I got to an Ebay advertisement for a green-gold Nichicon 6800uF 35V. Now I only get an error with that link.

2x3000uF Elna should be fine.

I am no expert in electrolytic capacitor technology. My impression is that the size depend on capacity/voltage, production technology and voltage margins in the design. I would assume that bigger Elna capacitors are at least no worse electrically than smaller Elna capacitors with the same capacity and voltage rating. The bigger ones may even have better voltage margins.

Is an electrolytic capacitor specialist available?
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Old 19th May 2018, 08:29 PM   #7
irribeo is offline irribeo  Netherlands
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Elko, radial online kaufen | Pollin.de
These are Nichicon VZ (and do not measure smaller).
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Old 19th May 2018, 08:36 PM   #8
Think is offline Think  Netherlands
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TPA3116 2.1 board input voltage capacitor advice
Quote:
Originally Posted by FauxFrench View Post
The ones I often use are the Nichicon green-gold type. No bad experiences. I believe when I earlier followed your link on the word "fake", I got to an Ebay advertisement for a green-gold Nichicon 6800uF 35V. Now I only get an error with that link.
.........
That link is indeed incorrect ; this should work http://www.nichicon-us.com/english/p...s/pdf/e-vz.pdf
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Old 19th May 2018, 09:26 PM   #9
Think is offline Think  Netherlands
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TPA3116 2.1 board input voltage capacitor advice
Quote:
Originally Posted by irribeo View Post
Elko, radial online kaufen | Pollin.de
These are Nichicon VZ (and do not measure smaller).
This looks just like the swollen/bulging one on the board.
Where did you find the measurements?
Strangly I can't even find them at that webshop (so good find!) searching for Nichicon and the price is only twice of that of a similar one sold as Nichicon at 1/13th (470uF) capacity. Is this normal / to be expected, or is there some Nichicon fake or economy/consumer/die quickly product line?

This cap is with it's 40 cents even cheaper then the cheapest I could find on ebay; to bad shipping is 5/$6.

The horizontally mounted cap does not seem to be a very good idea because of the longer leads and ability to only use 1 cap, but when this caps head swells, it pushes the leads towards the heatsink and can short isself out...
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Old 19th May 2018, 10:01 PM   #10
irribeo is offline irribeo  Netherlands
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I checked size here, just befor posting. They were linked in another thread some time ago, Pollin seems to have these for some time already and they bought old stock somewhere.
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