Electronics > Beginners
CAPACITOR Checking
Shock:
--- Quote from: Electro Detective on July 27, 2019, 09:40:39 am ---If you haven't sledged it yet :horse:
Charge it up to it's operating voltage and discharge, repeat a few times, then discharge it and run the tests again
--- End quote ---
Ebay it as fully tested.
Siwastaja:
--- Quote from: HighVoltage on July 27, 2019, 08:33:27 am ---I got bags of electrolytics, all brand new, all originally packed, from a friend who closed a professional repair shop.
By looking at them, I could already see that some of them had leaked badly. I ended up testing all of them and more than 80% were deteriorated, although the brand was not bad.
--- End quote ---
Even high-brand manufacturers have had occasional epidemics of bad materials or processes. The most well-known is the "capacitor plague" in early 2000's, with the low-ESR models back then. But it wasn't the first time, and won't be the last time.
I have seen and measured dozens of different unused new old stock electrolytic caps. One particular Nichicon type I had access to, had leaked without use, in about 15-20 years, you could both smell it and see it. And yes that particular type was 100% bad, every single unit more or less leaked. OTOH, all others (at least 20-30 different capacitor models) I have measured have been 100% OK despite age between about 10 to 20 years.
Electro Detective:
Surely there must be a purchase source in 2019 for decent capacitors that one can hoard have in stock for few years ::)
without worrying about leaks, dry outs, chemical contamination, online fakes,
and everyones favorite > industrial thievery producing inferior knockoffs
..or do the corporats plan this deliberately to sell new crappy cap filled gear and top up landfills :--
and make DIY electronics repair and design a living HELL for anyone daring to wield a soldering iron?
It's bad enough one needs a freakin microscope just to see today's rats piss filled ticking time bomm caps on PCBs |O
How much wishful thinking faradites can occupy such small spaces reliably anyway? :popcorn:
Mini Rant over :D
Siwastaja:
--- Quote from: Electro Detective on July 28, 2019, 11:19:45 am ---
Surely there must be a purchase source in 2019 for decent capacitors that one can hoard have in stock for few years ::)
without worrying about leaks, dry outs, chemical contamination, online fakes,
--- End quote ---
Surely there are:
* Digikey
* Mouser
* Farnell / Element14
* ... and many others
And good brands, such as:
* Panasonic
* Nichicon
* Rubycon
* Kemet
* Cornell Dubilier
* ... and many others
But there's no need to stockpile them. They do have a shelf life, even if it's practically a lot more than just a few years. But time flies... Buy when needed. You could also expect the new high-tech aluminum polymer electrolytics to drop in price, hopefully.
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