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4hv.org :: Forums :: General Science and Electronics
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Plastic Polystyrene Plate High Voltage Capacitors

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Michael Witt
Sat Mar 11 2006, 02:37AM
Michael Witt Registered Member #282 Joined: Sat Mar 04 2006, 11:45PM
Location: North Chicago, US
Posts: 28
 		Cool amazed ! Anyway, how are the plates now? are they dead?
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Mike
Sat Mar 11 2006, 03:54AM
Mike Registered Member #58 Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
 		Oh, No, they are actually in quite good condition with no ruptures or tears in the plates.
Quite Durable.
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Michael Witt
Sat Mar 11 2006, 04:39AM
Michael Witt Registered Member #282 Joined: Sat Mar 04 2006, 11:45PM
Location: North Chicago, US
Posts: 28
 		Wow. I wonder how much voltage you can safely put into them (as in without sparks).
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Mike
Sun Mar 12 2006, 07:48AM
Mike Registered Member #58 Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
 		Here is another video of the capacitor arcing against some steel wool to make some fun sparks, nothing near TDU type stuff but still ;]
Link2
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Dr. Shark
Wed Mar 15 2006, 12:14PM
Dr. Shark Registered Member #75 Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
 		From the figures you give in the video ( 27nF charged at 55kv) you should have an energy of about 40J there. With 15 plates thats more than 2.5J per plate, so I definitely think it is feasible to construct high energy caps in this way. I just went shopping for some cardboard plates (could not get the plastic ones) and I'll try if I can repeat your results.
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IamSmooth
Wed Mar 15 2006, 04:44PM
IamSmooth Registered Member #190 Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
 		The HV breakdown of cardboard and plastic is very different. If it is really cardboard, make sure you don't start a fire.
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Dr. Shark
Wed Mar 15 2006, 05:04PM
Dr. Shark Registered Member #75 Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
 		I know, but the dielectic constant is pretty similar, and if I soak them in oil, the breakdown will hopefully be OK. This in only preliminary testing, if it works I will get 1000 or so plastic plates off eBay smile
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Tipp
Thu Mar 16 2006, 02:33AM
Tipp Registered Member #215 Joined: Sun Feb 19 2006, 09:14PM
Location:
Posts: 30
 		My HV caps are all done with large 1/4" Lexan or Plexiglass sheets (usually 1 ft by 2 ft) or larger. Havent failed yet! Had them up to 45 kV so far.

For the plates, I use foil tape. Not only does it stick, but you can remove the wrinkles with the back of a spoon and they stay flat! This really helps increase capacitance. You can get aluminum foil tape in the painting section of your local hardware store. I bought a 500 ft [by 2" wide] for 15$ [on sale, w00t] and I have tons left. It's incredably handy! You can use it for everything! Works excellent for bottle caps too. I know some other people use this as well. They stay charged up for quite a long amount of time [ round 5 min ] and still throw a bright spark when discharged.

Anyways, very cool idea! I usually enjoy buying stuff from the dollar store and seeing how it copes with HV shades

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Wilson
Tue Mar 28 2006, 04:35AM
Wilson Registered Member #78 Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133
 		btw Mike, are you using the plates which are fully flat? or the ones with the little bumps?
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Mike
Tue Mar 28 2006, 05:07AM
Mike Registered Member #58 Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
 		Well the plates are all smooth, except for on the top rim where there grooves running along the edge. I got them from safeway.
Mike
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