About 1KG worth of unused electrolytic capacitors with free shipping worldwide - Page 1
Forum section: electronics / general

author: ZeTeX
author_rank: Frequent Contributor
timestamp: April 02, 2017, 10:47:24 pm
content: http://www.ebay.com/itm/252840440835

author: buck converter
author_rank: Regular Contributor
timestamp: April 02, 2017, 11:16:47 pm
content: Wow! That is a lot of capacitors. Wonder what that could go for

author: Dave
author_rank: Super Contributor
timestamp: April 02, 2017, 11:37:41 pm
content: They might be old and from what I can see they are some random Chinese caps. They probably aren't worth the cost of shipping.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: April 02, 2017, 11:41:56 pm
content: Quote from: Dave on April 02, 2017, 11:37:41 pmYep, those are indeed cheap chin chong long dong capacitors but they are not old at all, and most of them never used once.If I didn't had so much capacitors and I saw this on eBay I would probably go for a bid, 20$ is not much for so much and even if they are cheap crappy one they are still use-able and great for breadboard and prototypes, I doubt you can get same amount unused for 20$ anywhere.Of course if those were geniue Japanese capacitors the price would be 190$ not 19$ lol.

author: Brumby
author_rank: Unknown
timestamp: April 03, 2017, 03:22:36 am
content: I have enough unused ones to keep me out of mischief for the time being.

author: aargee
author_rank: Frequent Contributor
timestamp: April 03, 2017, 05:36:42 am
content: Yes, thinking about buying a set of quality ones. The ex Dick Smith ones (Hitano) are allergic to switchmode power supplies.

author: james_s
author_rank: Super Contributor
timestamp: April 03, 2017, 05:46:01 am
content: IMO good quality capacitors are inexpensive enough that there is no sense in buying cheap unknown junk. I've spent enough time replacing failed electrolytic capacitors that I always get the best ones I can find that will fit in the needed space.

author: Dave
author_rank: Super Contributor
timestamp: April 03, 2017, 09:51:32 pm
content: Quote from: ZeTeX on April 02, 2017, 11:41:56 pmYou may not be aware, but liquid electrolyte caps deteriorate even if they are just sitting on a shelf. You don't have to use them for them to become turds.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: April 03, 2017, 10:06:14 pm
content: Quote from: Dave on April 03, 2017, 09:51:32 pmOK, how much time does it take for them to dry out if they are not used? I have those for about half a year sitting in a box.Reading here:http://electronics.stackexchange.com/questions/8794/do-electrolytic-capacitors-have-a-limited-shelf-lifeit doesn't seems to be such an issue.

author: james_s
author_rank: Super Contributor
timestamp: April 03, 2017, 10:41:53 pm
content: I've heard this, although in practice I've used electrolytic capacitors that have been sitting around for decades and have not had a problem. That may not be true of some types though.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: April 03, 2017, 10:56:48 pm
content: Quote from: james_s on April 03, 2017, 10:41:53 pmYeah. Me too. While I have had some go bad from sitting on the shelf, or from low stress use, I can count those on the fingers of one hand. Now if you start putting a lot of current in and out of them the story seems to change quite a bit. Viewed objectively the failure rate is still not horrible (a few percent after a decade or two of service), but definitely enough to put them in the front row of failure modes. The only thing I have ever had fail at a higher rate was the filaments on vacuum tubes.

author: james_s
author_rank: Super Contributor
timestamp: April 03, 2017, 11:04:10 pm
content: I've had lots of capacitors fail in SMPS applications that were not old or used at all though. That is just a very harsh environment for capacitors and cheap ones are less likely to tolerate it.On the plus side, I've gotten lots of nice monitors and TVs and whatnot for free that just needed a few new capacitors.