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Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Well done Peter! I watched the show with my two year old who absolutely loves tesla coils, and was transfixed through the show. "Teta coil" is what he actually calls them and reminds me of that every time he comes into my workshop and sees my 6" coil. Again, well done.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Avi wrote ...
How-come sparks to your hand don't cause you any reaction, yet other people feel its very painful?
They do hurt but I know what to expect. A first time person is scared and waiting for that first zap. It's the long multiple camera takes for the closeups from different angles that starts to get sore. "Hold it there... hold it there..."
The best trick is to draw sparks onto a screwdriver. Absolutely painless if you hold the metal shaft but a noob will hold the insulated handle and sparks will then jump onto the fingertips which hurts (a bit).
That little Tesla coil runs on the good half of a small NST (?9kv/10mA) with a parallel pipe static gap of 3 gaps. A bunch of old ceramic caps (perhaps .001uF), a primary of perhaps 10 turns of insulated wire and a 4 inch diameter secondary with perhaps a couple of hundred turns. Was never intended to be designed properly, performs woefully with max 2 inch sparks. Took no time at all to make. Think I have a globe to indicate power on plus a mains noise suppressor out of a microwave oven. runs off a variac or plug in directly. no switch. Neon unit is out of a car neon, modified and has a wire back to earth. I usually have a aluminum foil counterpoise underneath the unit which uses mains earth.
That TC has now been shown on TV on 3 different news shots (Today Tonight, WIN and at least a couple of channels at the Cosmology Gallery opening) and in Holland.
The big advantage of course is that it is so small and safe and you can interact with it, either with the neon or by having sparks directly onto your hand. Easy to photograph and zero setup time.
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Tesla Downunder on TV in Australia
