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where to buy capacitors?

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Barry

Mon Jan 26 2009, 10:12PM

Registered Member #90 Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301

Let's start a on-going thread of capacitor sources. When you see a good deal, add it to this thread!

This is a common topic that pops up, over and over again. And for good reason, too: Capacitors that are good for electromagnetic launchers are simply not found laying around the house or in local retail outlets like Radio Shack.

From time to time there are special bargains on capacitors through eBay and many other sources.

For starters, I'd like to highlight a really good deal in the UK. The guys who built the 7KJ coilgun for Discovery Channel are now putting up the parts for sale on eBay. They're offering the two fully built capacitor banks on eBay auction number 330303360170.

Try this link

(but eBay links often fail) or just search on item number 330303360170.

Cheers, Barry

rp181

Mon Jan 26 2009, 10:56PM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529

Link works for me,
Lets not forget the ever popular

Keep in mind these are surplus, no idea on there condition, though people have had good success with these (including me)

big5824

Mon Jan 26 2009, 11:15PM

Registered Member #1687 Joined: Tue Sept 09 2008, 08:47PM
Location: UK, Darlington
Posts: 240

This guy recently started selling very cheap caps on the uk ebay, i got 10kj for only 25 pounds (5x 22000uf 400v), oh and remember that 18 off means 18 capacitors, that suprised me when 5 caps arrived instead of the 1 i was expecting

hotcrazyfruit

Tue Jan 27 2009, 03:53AM

banned on 5/26/2009
Registered Member #1877 Joined: Mon Dec 22 2008, 02:03AM
Location:
Posts: 147

has some good capacitors, mind you they are insanely expensive. and thats

if your in the states. i got mine from

, extremely high quality. and they offer samples.

Barry

Tue Jan 27 2009, 06:21AM

Registered Member #90 Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301

Good tips guys, thanks.

I recently bought 6KJ of capacitors on eBay from seller 'bcd-parts' at an extremely good price. The seller said he had a couple huge bins of these caps remaining to sell. I bought two lots of 12 caps, each one is 2400 uF 450 vdc made by Philips. That's 243 joules in each can, the total price including shipping was $121 usd.

This is 2.1 cents per joule! Great stuff.

Your price may vary on eBay. All parts have been checked and they meet specifications, but they are obviously used and some have been dented. They had prompt shipment and excellent packaging.

Here is a screen shot after the auction closed.

Cheers, Barry

aonomus

Tue Jan 27 2009, 12:14PM

Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801

Yea, I believe Arcstarter posted that deal in the IRC channel, and then the sale/trade forum prior to the server rollback.

For future reference I've gotten all my caps local, anyone in Toronto looking for Capacitors go to A1 Electronics.

Also, a ebay user named henhuggers is good for alot of big semiconductors, I got 4 puck SCRs from him (2" diam)

rp181

Tue Jan 27 2009, 05:05PM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529

They seem expensive, but general atomics energy products pulse capacitors are as low as 10 cents a joule (for a 200kJ unit)

Scavies430

Thu Jan 29 2009, 02:01AM

Registered Member #1924 Joined: Sun Jan 11 2009, 09:30PM
Location:
Posts: 12

microwaves have become a wonderous salvage source of capacitors and magnets and transformers if you ever stumble upon one.

101111

Thu Jan 29 2009, 12:08PM

Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263

Scavies430 wrote ...

microwaves have become a wonderous salvage source of capacitors and magnets and transformers if you ever stumble upon one.

It sure can, but the microwaves capacitors can't hold a charge big enough or long enough, big awesome electrolyte capacitors can. But you have a good point, once upon a time when I was dumpsterdiving I found a huge inverter with 2x 1000ÂµF capacitors in it.

audio:deviant

Thu Apr 16 2009, 08:10PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

hello i've been roaming the net for ages now for caps and was just wondering what the difference is between these two? theres quite a big price difference. so i dunno really. this is for the mmc so would need 12

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