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4hv.org :: Forums :: High Voltage
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333j MOC capacitor bank
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Mads Barnkob
Mon Dec 29 2008, 01:31PM Print
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		Hey all

Here are what I have build in relation to the earlier thread about MOC banks: Link2

It consists of 21 microwave oven capacitors in parallel for a total capacitance of 18,5 uF charged to 6000VDC. Resulting in 333j energy stored.

You can see all the pictures and construction notes on my homepage: Link2

I will add a movie later with various explosions, can crushing etc, just need some time to edit it all together :)
1230557516 1403 FT0 Img 1445
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uzzors2k
Mon Dec 29 2008, 02:50PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		Awesome, MadsKaizer! I have bank of 20 MOCs too, but haven't finished constructing it yet. Crushing coins might be hard with just 333J, but you have to try when you can charge the bank up to 500J or so. You've found lot's of useful information, I'll keep your site in mind when I built m bank.
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Mads Barnkob
Mon Dec 29 2008, 04:39PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		Thanks :D

I actually tried twice to shrink a coin, forgot to write about that. It was a danish 5 kr, which is a rather heavy coin. Link2

First try I just launched it across the garage, second try with some wood around and holding it tight, the coil suicided on me :)
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Mads Barnkob
Tue Sept 01 2009, 04:22PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		I were at my parents house for a party, so I dusted the MOC bank off that is currently stored in their garage.

It was time for some small water dishcarges, since I read about that in a thread not long ago.

There might be a fruit inthere taking some punishment too, and alot of drunk bystanders :)

Link2

The sound is awful, it was really loud discharges, but the samsung NV24HD camera turns down the sound when it gets "too" loud :/

Performance information: this bank now have atleast 200 shots and still no MOC failures.
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HV Enthusiast
Tue Sept 01 2009, 06:34PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Be careful with discharging Microwave Oven capacitors like that. They aren't designed for pulse applications and could explode. And when they do explode, they violently explode.
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MinorityCarrier
Tue Sept 01 2009, 06:39PM
MinorityCarrier Registered Member #2123 Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
 		Wear safety goggles at least.
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Mads Barnkob
Tue Sept 01 2009, 08:47PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		Dr. Gigavolt: its a relative low energy bank, so lets say there is a failure doing a discharge, most of the energy would have gone in the first ringup, bleeding resistors would start burning some, but all the remaining energy would discharge in the failing capacitor right?

The capacitors are mounted in a room with open side to avoid any pressure buildup if there should be a failure.

Noone stands in the direction of the open side, I can see that my back could have taken a few scrapnels if it was to happen. Looking away and having my head in "cover" opposit of discharge/open side is no excuse for not wearing goggles, but they were at home.
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Proud Mary
Tue Sept 01 2009, 09:40PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		I'm pleased someone followed up my post about discharges in water - if you look up the literature on sonoluminesence you'll perhaps get the drift of my latest ideas.
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Mads Barnkob
Sat Dec 26 2009, 11:50AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		Doing the holidays I thought why not blow up some snow while its here, so I did :)

With a little help from aluminium foil and steelwool it was somewhat easier to do, low power banks leaves a lot to wish for :)

Link2


The bank is somewhere around 250 discharges without failures.
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