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4hv.org :: Forums :: High Voltage
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Odd HV Cap Identification

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Avalanche
Mon Jun 12 2006, 05:55PM Print
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I picked up 6 of the following capacitors recently at a radio rally/hamfest.

They are rated 1000pF / 10KV but I am unsure what kind of caps these are, or if they would be suited to Tesla Coil use.

I'm guessing they are ceramic, or mini 'doorknob' caps, but encapsulated in plastic with leads attached. They measure 24mm by 8mm. What I would like to do is parallel them all, for a 6nF 10KV cap, and charge it from a flyback with a safety gap for 10kv! Should make a good cap for my latest mini coil (not the one in the projects forum)

Anyone know what they are?
1150134958 103 FT0 Mysterycapii
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Jim
Mon Jun 12 2006, 08:35PM
Jim Dunce.
Registered Member #28 Joined: Fri Feb 03 2006, 03:29AM
Location:
Posts: 76
Actually those are cherry flavored candies.










they're ceramics.
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Avalanche
Mon Jun 12 2006, 08:44PM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
lol cheesey thanks, I guess if they are ceramic they should be ok in a TC.

I'll try them out anyway and see what happens...
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HV Enthusiast
Mon Jun 12 2006, 09:35PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
I'm guessing its a ceramic capacitor.
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Electroholic
Tue Jun 13 2006, 02:44AM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
i had a few that looked exactly the same, yes they are ceramic, and i did try to use them on my mini SGTC, 6 in parallel, worked perfectly for about 5 seconds. then i guess i over volted, the bank shorted.
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ShawnLG
Tue Jun 13 2006, 03:01AM
ShawnLG Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
ceramic capacitors are not good for TC duty. They will die.
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Sulaiman
Tue Jun 13 2006, 11:32AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I've used ceramic capacitors like the one shown for SG TC
They are OK but not good (DF=1% to 5% typically)
but you need to consider the current rating (I^2.T)
Hand-rolled (short-lived) capacitors I've made of pvc give similar results
Hand-rolled polythene gives 'snappier' sparks
MMC of polypropylene (KP) is much easier.

Ceramic capacitors are really good for an NST filter (Terry Filter etc.)
with mainly 50/60 Hz high voltage and less RF voltage across them.

Also good for voltage multipliers above audio frequencies.
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Avalanche
Tue Jun 13 2006, 09:47PM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Thanks for the replies

I will probably not risk destroying them then, as I have enough poly caps to make the MMC. However, it will probably end up too big to fit in my case, unless I can really re-think the layout.
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