Here are basic instructions for building a "generic" tesla coil

    Ok, here's a design for a small tesla coil HV generator (the first stage). I built this when I was an apprentice at UKAEA winfrith. It is originally derived from a design in Practical Mechanics 1963.   Use a robust 12v Car ignition coil, usually rated at about 50W. This design uses mains electricity 240V UK. Get from RS or any component supplier, a solid state phase angle switching circuit.

I don't know the stock No. but they are basically a light dimming circuit using a triac and an inductor within a single 3 pin chip. They come in a variety of current ratings, I used 6A which is probably way over the top, but better safe than sorry. You need to get a 1Meg variable resistor to vary the phase angle. So connect up the phase angle device, with 1 meg resistor and place a 3 microdfarad cap in series with the output (use >250 volts rated cap). Now connect to + and - terminals on the coil.

You should be able to run the spark gap directly from the HV terminal of the coil. I have got sparks about 30mm (approx 30KV) from this arrangement. **BE CAREFUL** I have seen a 15 stone man thrown across a room while foolishly trying to see if the spark was hot enough to melt solder! You can use this to drive a tesla coil.     I use a 500pF cap at 30KV rating and a flat spiral primary with about 26 turns. Secondary is about 1200 turns on a 300mm long form, diameter 2". Output from this is about 70Kv.

  A good trick to do with a tesla coil is to get a sheet of plastic or wood, about 2" x 3" and either paint it in luminous paint(Phosphorescent) or get luminous powder and mix with clear silicone sealant (polysiloxane) and spread it like butter over the p lastic or wood substrate. BEFORE the paint or sealant dries, get copper or metal filings and sprinkle evenly and sparsely over the surface of the drying paint / sealant. Press gently to ensure secure fixing of the filings. Allow to dry (24 hrs). Then fix the bottom of the wood to the HV tesla terminal. The sparks now track for up to 6 times the distance of tracking in dry air - and also where the sparks track ove the surface, they leave an image of a ghost spark that remains visible for a few seconds.

This looks fantastic in the dark and increases the apparent power of a small tesla coil. I am currently building a large tesla coil, using a 1KW 26KV transformer as the driving stage. I welcome any tips from people who have the arcane knowledge and experience in these things.   Hold tight cyberpunk technopagans

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