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Forums
4hv.org :: Forums :: Sale and Trade
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Capacitor trades

1 2 
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Conundrum
Wed Apr 04 2007, 06:14PM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
 		Hi all.
I have some surplus HV capacitors (ceramic, russian "orange glaze" type) and also some conventionally wound 15KV capacitors.

Any use? I'm after some 68000 uF 35V+ capacitors in exchange, for a spot welder.

Capacitors have been tested and seem to work as far as I can tell, unfortunately the microwave diodes didn't :(

If you can help, I am happy to send the parts your way first.

Thanks, -A
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...
Wed Apr 04 2007, 08:59PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		Have you considered a mmc? This auction should cover it...
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Conundrum
Thu Apr 05 2007, 07:19PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
 		Yup, just need 10 of those arrays. Capacitor size required is 680,000 uF according to the article I found (voltage between 20 and 35V)

I did find four 6800uF 35V radial capacitors and also some spares from a fairly new amplifier, so this gets me up to 57200 uF which is better than nothing.

-A
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Steve Conner
Fri Apr 06 2007, 11:02AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		I have a 100,000uF 16V cap somewhere if it's any use to you.
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ShawnLG
Fri Apr 06 2007, 02:39PM
ShawnLG Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
 		"I have a 100,000uF 16V cap somewhere if it's any use to you."

Are these the capacitors that audiophile like to use on their audio equipment.
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Ken M.
Fri Apr 06 2007, 07:51PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
 		I don't think so since most audio (Car audio that is) that I know of use 1-100F caps, I could be wrong though, but Steves cap is 100mF, it would be more like a cap out of an old tv just lower voltage.
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Michael W.
Fri Apr 06 2007, 10:02PM
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
 		This is a 100000uF, 20V Electrolytic, I think its a bit bigger than whats in a T.V.....
Link2
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ShawnLG
Sat Apr 07 2007, 04:32AM
ShawnLG Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
 		"This is a 100000uF, 20V Electrolytic, I think its a bit bigger than whats in a T.V....."
Wow, I had one of these capacitors years ago. Same make and ratings. These would not deliver enuff power to spot weld.

You might want to check this out.

Link2
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Billybobjoe
Sat Apr 07 2007, 08:49PM
Billybobjoe Registered Member #396 Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
 		Tadaaa!! DSC02322 (Those are mine)

Like others have said, I'm not sure these will provide enough current for spotwelding anything substantial.
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Conundrum
Sun Apr 08 2007, 12:10AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
 		IIRC 500,000 uF at min 25V is required, so you'd need 5 in parallel.

In any case its always better to use an array of small capacitors rather than one large (and expensive, and fragile) capacitor, the ESR is always lower.

To switch, use an SCR on the -ve side as its far more precise and you can include safety systems.

-A
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