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Forums
4hv.org :: Forums :: Tesla Coils
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Counterpoise and few other thingies

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Njubster
Mon Apr 29 2013, 02:51PM Print
Njubster Registered Member #6857 Joined: Sat Sept 22 2012, 08:25AM
Location: Srbija, Novi Sad
Posts: 40
So I made this little coil Link2 and got some pretty decent results, though it needs quite a bit more work. Later I found out that grounding the secondary to flyback's ground and touching it's sparks isn't a very bright idea. I have no ground in my wall outlet's, and I'm currently living on a second floor of a residential building, so I cannot do a proper grounding.

So I read somewhere that counterpoise can be used for ground, but haven't found good explanation for it's construction. Anyone knows if that could work, and how do I make it?

And about capacitors, HV block capacitors are not easy to find, so now I use 4n7 3kV ceramic ones. Why are ceramic capacitors so bad?

And I want everything to fit in that little box, I want it to be as portable as possible, so, once I get the normal block caps, do I risk sparking too much if I arrange them like this:

Aranzman Zps17f457f9

It is powered by flyback running of 12V.

Sorry cause I'm boring rolleyes
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radiotech
Thu May 02 2013, 01:50AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
You could cut out, or make a 1 meter diameter foil circle and place your coil in the center,
with a metallic connection to the bottom end of the secondary.

Then power your coil from a battery only, (no mains whatsoever) with the battery close
to, or inside the base box.

Then you can enjoy all the sparks you want without arousing the ire of
your neighbors.
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Katya
Mon May 13 2013, 04:19AM
Katya Registered Member #9020 Joined: Wed Dec 26 2012, 12:11AM
Location:
Posts: 4
I generally try to keep the potential differences between strings as small as possible and as equally distributed as possible by arranging the strings in parallel with adequate spacers between strings.

In a second floor situation, I'll either run a wire to a window sill or a copper rope to the bathroom faucet. In your particular case with this particularly small coil, consider a metal screen laid on the table as a possible counterpoise.

Edit: Try not to make your coil too small for maintenance and arcing reasons.
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