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#1 |
Member
Join Date: Sep 2015
City & State: Essex
My Country: UK
Line Voltage: 240VAC 50Hz
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![]() 3 or 4 years ago I purchased a TDA7293 amplifier board from eBay.
I have never used it, but I looked at at and noticed that the large filter caps are ostensibly Nichicon PS(M) 2200uf 50v. They measure around 16x26mm (15x25mm?). I was surprised that a cheap board would come with capacitors like these. The small ones on the rest of the board are various cheap brands. This is more curiosity than anything else, but I wondered whether they are fake. In particular I noticed the difference in heat-shrink at the top, and the slightly different looking vents. Is this disparity in appearance normal? |
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#2 |
Badcaps Veteran
Join Date: Jul 2004
City & State: North Springfield, Vermont
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![]() The stamps, don't even look like they were manufactured by Nichicon.
I'm calling foul!
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#3 | ||
"Oh, Grouchy!"
Join Date: Jan 2011
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![]() You better believe they're fake...
Pull em- they'll have flat or bullseye bungs. Seen on lots of cheep kits/modules, on banggood, icstation, ebay, etc. "Perception management"- kitmakers' items stand out this way. "Japanese caps are better," amiright? ![]() It's an earlier module you got. The stock pix still show fakes, but they're shipping now with fakes in their natural appearance. Got some BG kits here with "BH," "JWCO," "changX/chongX," which is what those "Nichicons" really are. Such low grade trash they don't even bother to get the colors right. Real PS are brown with white printing, like PWs; not just fakery but half-ass fakery, like they're not even trying. Again, all about perception. ![]() 2200u 50v PS are 18x35.5mm. ![]()
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Last edited by kaboom; 10-21-2020 at 05:16 PM.. |
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#4 |
Badcaps Veteran
Join Date: Aug 2005
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![]() Unless Nichicon changed the color of their sleeving for the PS series in the past 10 years, the black sleeving is the wrong color. Should be brown.
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#5 |
The Boss Stooge
Join Date: Oct 2003
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![]() 100% phony.
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#6 |
"Oh, Grouchy!"
Join Date: Jan 2011
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![]() Well... aren't we being modest here?
Those are at least 110% phony! ![]() To the OP: They seem small for 2200/50v and may in fact be several voltage ratings below their "sticker value." They could be as low as 1000u/25v, so beware of applying what appears to be rated voltage. There were some BG reviews of amplifier kits stating the "25V" caps leaked or oozed below their rating. By stark comparison, recently purchased late-80s NOS 10,000u/25v Panasonic snap-ins had leakage under half a milliamp after ~3mins at 25v thru a 10k resistor. |
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#7 |
Member
Join Date: Sep 2015
City & State: Essex
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![]() Thanks all!
I took them off and yep, bullseye bung. Tested at 2112uf on my cheap meter, so at least that's normal. The other caps on the board are: 2x Jwco 47uf 50v 105c (12.5x5mm) 2x CZF 10uf 50v 105c (12x4mm) I suppose that they are also not actually 50v? Also of note is that the SEP KBL608 regulator looks like it has been re-used. The one thing that actually seems OK is the TDA7293 itself. Alcohol doesn't take the markings off. I've attached some pictures. |
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#8 |
Member
Join Date: Sep 2015
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![]() I should say the SEP KBL608 rectifier.
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#9 |
Badcaps Veteran
Join Date: Jan 2018
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![]() What was ESR? The fakest of fake caps will still be around the correct capacitance.
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#10 | |||||
master hoarder
Join Date: May 2008
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![]() LOL.
I bought one of those TDA7293 boards recently as well for GP speaker tests and whatnot (but may end up using it in a small subwoofer that has a control board more complex than a space station.) At least mine came with truly genuine ChongX caps, though. ![]() ![]() ![]() As for some of the smaller caps on my board - JWCO brand, like yours. I'm not surprised, of course, because I paid absolute bottom-dollar for the board I found. ![]() ![]() If they are miniaturized 85C GP caps, they might (optimistically) be capable of handling 50V. Just as a comparison here, I do have genuine Nichicon RS, 50V, 2200 uF caps attached on a Sony CRT TV audio processor (AK) board (I don't recall which model Sony it came from, but board p/n is 1-674-082-31 if anyone wants to know for whatever reason.) These Nichicon caps measure 18x25 mm (datasheet says they should be 20x25, but these could be custom-order for Sony), are rated for only 85C, and have a black sleeve with white text. (On that note, I wonder if that's what your counterfeit Nichicons were trying to impersonate, lol.) With my ChongX being slightly taller at 30 mm (but only 16 mm dia.), I could give them benefit of the doubt that they may stand up to their 50V rating. But would I? IDK, probably not. ![]() Quote:
Hopefully it came out of some junk legit power adapter. Otherwise, if new, you never know how legit the part is and whether it will do its ratings. Quote:
FWIW, though, these boards are still pretty cool to play around with for just a few bucks. Just don't expect miracles out of them, obviously. At the same time, also expect there to be some chance of magic smoke, regardless of how you treat them. ![]() Quote:
Ask Garage54 why. ![]() It's a Russian YT channel for silly car mods^ Quote:
Now you're tempting me here to remove mine and give them full voltage. Quote:
Good Japanese caps are good, even at 20-30 years age. Sure there were a few problematic series. But overall, I'd use an old/NOS Japanese cap any day over China garbage that doesn't even have the courage to stand under its own brand name (and tried to counterfeit others.) Last edited by momaka; 10-23-2020 at 08:19 PM.. |
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#11 | ||||
Member
Join Date: Sep 2015
City & State: Essex
My Country: UK
Line Voltage: 240VAC 50Hz
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I read that scam emails purposely misspell words to ward off those who are paying attention. Though I suppose it's more likely that they simply don't know or care ![]() Quote:
I see that Fujicon is especially well-known on this forum. I wonder how many of the others are marques of the same manufacturer(s). Quote:
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Nice to have some excitement! Last edited by s675; 10-24-2020 at 11:53 AM.. |
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#12 | |
HC Overclocker
Join Date: Jul 2012
City & State: Singapore
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![]() Quote:
![]() ![]() ![]() ![]() yea its nice to get some excitement in our boring lives to keep us on our toes and to make life worth living lol! dont let fear dominate you. dont let fear stop u from living your life to the fullest! oops... not the vip room... i'll stop now. ![]() |
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#13 | |
Badcaps Veteran
Join Date: Jul 2004
City & State: North Springfield, Vermont
My Country: USA
Line Voltage: 118-127V 59-63.5 Hz-> actualizo: pérdido de voltaje
I'm a: Knowledge Seeker
Posts: 6,038
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