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Old 13th October 2021, 10:03 AM   #7321
eduard is offline eduard  Netherlands
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Hello,
Buying a 20 $ Samsonite in Vietnam when you are there can give you a product that you can use for walking around with some basic stuff hoping it will not fall apart.
The North Face has a factory over there and you can fool yourself thinking that a cheap jacket you just bought was actually made there but ended up in an illegal way on the market where you bought it. Once you do this you commit an offense.
There are companies out there which know how to make more than decent quality products but you will need local help or serious expertise to find them.
If you have the machinery to make clothing you can make good or bad ones. BUT if you start by using a bad fabric it will never be good.
Making a supercap is in a different league i guess. Everything has to be good to give a good product. If a sub standard foil is used it wont last or can be unreliable. Havinbg a zipper in your jacket stop working after 3 weeks is bad but burning down your house because a 2,7 volt cap collapses at 2,3 volt is worse.
Doede had two cheap caps in series where one of them was far off from promised specs.
So MANY bad caps stories on the internet i would always stick with companies like Mouser. To me products being available on '' the dark web '' while the usual suppliers have been out of stock for months must be wrong.
If you wanna take the risk it is up to you.
Greetings, Eduard
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Old 13th October 2021, 10:54 AM   #7322
kunlun121 is offline kunlun121  Netherlands
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Quote:
Originally Posted by eduard View Post
Hello,
Buying a 20 $ Samsonite in Vietnam when you are there can give you a product that you can use for walking around with some basic stuff hoping it will not fall apart.
The North Face has a factory over there and you can fool yourself thinking that a cheap jacket you just bought was actually made there but ended up in an illegal way on the market where you bought it. Once you do this you commit an offense.
There are companies out there which know how to make more than decent quality products but you will need local help or serious expertise to find them.
If you have the machinery to make clothing you can make good or bad ones. BUT if you start by using a bad fabric it will never be good.
Making a supercap is in a different league i guess. Everything has to be good to give a good product. If a sub standard foil is used it wont last or can be unreliable. Havinbg a zipper in your jacket stop working after 3 weeks is bad but burning down your house because a 2,7 volt cap collapses at 2,3 volt is worse.
Doede had two cheap caps in series where one of them was far off from promised specs.
So MANY bad caps stories on the internet i would always stick with companies like Mouser. To me products being available on '' the dark web '' while the usual suppliers have been out of stock for months must be wrong.
If you wanna take the risk it is up to you.
Greetings, Eduard
Partly my point. But none of this says anything about the quality of the product being offered. China is the world's factory and they are capable of making first rate stuff. What we buy from Mouser under the names Maxwell and Eaton is produced there. So is my laptop that has "Apple" written on it.

To me that company selling the 'Maxwell' caps looks pretty decent. (See the "about us" section in the listing.) They probably did manufacture the caps for Maxwell in the past. The Maxwell branding looks so good that they may even have the original file with Maxwell's branding style. It doesn't look like some shoddy copy job. So they probably know very well what they are doing. Probably. Apparently according to at least one rather trustworthy user here these caps work fine, which helps. Cleary Doede's mileage varied. But we don't know if these are the caps that he bought.

The Eaton caps on Mouser have the exact same dimensions as the original Maxwell caps (check drawings in data sheet.) They may very well come from the same factory as the factory where the original Maxwells were manufactured. Why may be the people advertising on AliExpress. Impossible to say. What exactly does it add that Mouser is the middle man instead of AliExpress?

What doesn't sit well with me is that the company is trying to capitalise on the Maxwell name to sell its own products. The "product discontinuation notice" published on Mouser does not mince words. As far as Maxwell or its parent company UCAP is concerned, back in February 2020 the UCs are "discontinued" and "end of life". That pretty definitive. (UCAP is the company that bought back the UC business from Tesla.)

There is no way of knowing whether, and there is no reason to assume that the caps offered on AliExpress are crap. As Eduard points out it is hard to evaluate the risk. So to every user his or her own decision about this.

I just thought that users here should know they're not buying anything made or sold by Maxwell. Because that is really not apparent from the AliExpress listing, except if you scroll down. And it's nice that there is an alternative at Mouser.

By the way, on eBay I found a most reasonably priced used set of six 3000F Maxwells including linking strips and balancing boards. These caps are built to last, so what could be the risk in that?
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Old 13th October 2021, 11:58 AM   #7323
eduard is offline eduard  Netherlands
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Hello,
I have a Vietnamese friend who works at Nike quality control. She can distinguish between copy and original most of the times.
Sure lots of products sold '' in the west '' are made by Asian companies and the serious companies here will make sure that the quality is at a certain level.
But the '' marketplace '' filled with copies is HUGE. There are a big number of companies that can supply copies that look like genuine for the most of us. Some of them with higher life expectancy than the original one.
For a jacket or a bag you could try to take a risk. For things that could get you into trouble i wont take the risk.
If a company that assembles jet engines needs 300.000 bolts they can save money by getting them at AliExpress but they will chose a supplier where every bolt will be up to the desired specifications.
There wont be dozens of factories producing supercaps Like toiletpaper producing companies they can deliver whatever looks you want to have. But better than average will cost more.
Doede just bought some cheap caps for some initial experiments and one or a few? turned out to be inferior. Buying at Mouser will give you extra security for sure.
Greetings, Eduard
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Old 13th October 2021, 12:53 PM   #7324
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Fortunately I bought some Maxwell 3000F/2.7V ultracapacitors from Mouser right before it had been discontinuous. .

Ian
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Old 13th October 2021, 05:50 PM   #7325
acg is offline acg  Australia
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Ian,

Are you aware of any sources for the balancing boards? I can't seem to find any.

Anthony
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Old 13th October 2021, 07:17 PM   #7327
A123 is offline A123  United States
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Hi Ian,

I'm similar to @eduard in that I'm only comfortable buying from Mouser, Digikey, etc.

I'm going to put a hold on scaling with Ultra Capacitors until I get my system up and running, so I'm in zero rush.


I noticed Mouser stocks the Skeleton Technologies brand (German HQ).

Skeleton product range doubles with 3 new modules and a 3.0V ultracapacitor with the highest specific energy on the market


Would the SCI3400 be an alternative if it becomes available on Mouser?

Click the image to open in full size.

Right now Mouser only stocks (2022) the SCA3200 which doesn't have threads, but if the SCI3400 starts appearing...

SkelCap SCH / SCI / SCK / SCL Series Cells
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Old 13th October 2021, 11:11 PM   #7328
eduard is offline eduard  Netherlands
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Hello,
I bought the Skeleton ultra caps for the UcHybrid boards after the ones from Maxwell used by everyone were not available at Mouser for a LONG time.
Skeleton looks like perfect quality to me and being sold by Mouser is enough reason to get a few. If i remember well there is another member using them.
Of course it is up to each of us if they are willing to take a risk and buy something that might be good, perfect or just very bad at some Chinese shop. I wouldnt even use them if i got them for free.
Better be without the ultimate sound quality for 6 months than owning something that
could burn down your house.
Greetings, Eduard
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Old 14th October 2021, 01:40 PM   #7329
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by A123 View Post
Hi Ian,

I'm similar to @eduard in that I'm only comfortable buying from Mouser, Digikey, etc.

I'm going to put a hold on scaling with Ultra Capacitors until I get my system up and running, so I'm in zero rush.


I noticed Mouser stocks the Skeleton Technologies brand (German HQ).

Skeleton product range doubles with 3 new modules and a 3.0V ultracapacitor with the highest specific energy on the market


Would the SCI3400 be an alternative if it becomes available on Mouser?



Right now Mouser only stocks (2022) the SCA3200 which doesn't have threads, but if the SCI3400 starts appearing...

SkelCap SCH / SCI / SCK / SCL Series Cells
The datasheet looks even better performance than the Maxwell 3000F UC
SCI3400:
ESR: 0.17mOhm
Capacitance: 3400F
Voltage: 2.8V

Will mouser keep them in stock?
Ian
Attached Files
File Type: pdf SkelCap-datasheets.pdf (1.25 MB, 9 views)
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Old 14th October 2021, 04:14 PM   #7330
eduard is offline eduard  Netherlands
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Hello,
If there is no Maxwell available and people want to buy them sure they will keep them in stock if they can get them of course.
Greetings,Eduard
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