Old 06-23-2009, 02:09 AM #1
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Default Very Large Capacitors

Hey guys. As a general electronics geek I, like most electronics geeks, like to occasionally play with very high voltage or high current electrical devices, often for no other reason than to do something dangerously stupid for entertainment.

Having grown bored with my 9000 volt neon sign transformer, I went onto ebay and purchased myself (for an excellent deal, mind you) a pair of 160,000 uf electrolytic capacitors. I keep them shorted out at all times in the interest of safety.




And while they aren't high voltage caps, they can dump a hundred amps into something in no time flat. And dump those amps I did.



I realize that shorting capacitors with screwdrivers is a bad idea as it is, nevermind almost a fifth of a farad while wearing a T-shirt. But it sure does make a satisfying snap and blow white-hot bits in such a pretty way. Like fireworks!

...come to think of it ... does eBay sell fireworks?


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Old 06-23-2009, 02:14 AM #2
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Default Re: Very Large Capacitors

very nice how many volts are they and how do you charge them.
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Old 06-23-2009, 02:17 AM #3
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Default Re: Very Large Capacitors

Wow nice pics, you might want to wear some thick rubber gloves when doing that.

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Old 06-23-2009, 02:22 AM #4
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Default Re: Very Large Capacitors

heheh, capacitors are fun

Mine don't quite have as much capacity as yours though. These were salvaged out of a DC welder that was being thrown away.

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Old 06-23-2009, 02:29 AM #5
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Default Re: Very Large Capacitors

I'm guessing these would be the caps.
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Old 06-23-2009, 02:34 AM #6
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Default Re: Very Large Capacitors

Quote:
Originally Posted by jamilm9 View Post
I'm guessing these would be the caps.
Yes those are caps.

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Old 06-23-2009, 02:38 AM #7
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Default Re: Very Large Capacitors

Quote:
Originally Posted by jamilm9 View Post
I'm guessing these would be the caps.
No those aren't the same ones. Those are 10v caps and mine are 30v. The ebay listing is here:
Sprague Electroclytic Capacitors 160,000 uF 30 VDC on eBay.ca (item 320379716589 end time 13-Jun-09 21:22:54 EDT)

I charge them with a simple variable DC power supply. I limit the current to 500mA and it takes about 10 seconds to charge to 95%
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Old 06-23-2009, 02:50 AM #8
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Default Re: Very Large Capacitors

Photoflash caps have lower internal impedance and are designed to DUMP !

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Old 06-23-2009, 02:53 AM #9
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Default Re: Very Large Capacitors

Yeah, don't they have an internal inductor to compensate for the capacitance of the discharge so they cancel each other out? I remember hearing something like that.

But I don't think photoflash caps come in this size.

Also, I just got the super incredibly stupid idea of shorting it with a strip of magnesium. Will it catch on fire? Will I be burned? Will I be blinded? We will find out tomorrow!

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Old 06-23-2009, 08:31 AM #10
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Default Re: Very Large Capacitors

I have a 330V camera cap not very big it is still strong
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Old 06-23-2009, 10:30 AM #11
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Default Re: Very Large Capacitors

I have several 600vdc ones i gotr out of an elevator control box lol i use one in my car for my stereo
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Old 06-23-2009, 01:19 PM #12
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Default Re: Very Large Capacitors

Wow...umm I used to have larger caps than that on my sound system in my car!!! LOL
Still pretty cool.
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Old 06-23-2009, 04:40 PM #13
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Default Re: Very Large Capacitors

Charge to 240kV
Put tongue in both terminals
Post pics (if still alive)
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Old 06-23-2009, 04:42 PM #14
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Default Re: Very Large Capacitors

Be a bit careful doing this - shorting out caps like that can cause them to start squirting electrolyte all over the place (nasty stuff!), or perhaps even explode if the pressure release is faulty.

Its not likely to happen from one snap, but if you keep doing it over and over for a while things can get risky.
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Old 06-23-2009, 05:26 PM #15
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Default Re: Very Large Capacitors

This is what I used to have in my car. 1 farad capacitor. For my sound system. I sold all of it though.
http://www.woofersetc.com/p2923/CPCD...-Capacitor.htm

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Old 06-23-2009, 10:37 PM #16
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Default Re: Very Large Capacitors

You need banks of capacitors ...

for spot welding sheet metal.

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