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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)
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.
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.
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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