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I talk about lessons learned in building a bi-polar teslas coil.
Here are the components and cost:
Primary coil is 6 turns of refrigerator ice maker tubing, helical, 9" diameter. About 16' 3/8" OD tubing. I found shorting two of the outer windings together tuned it the best (5 effective turns). $20
Secondary coil, 26" long wound on 2 3/8" Diameter PVC ⋅ 26awg Wire. 1600 turns. Purchased on ebay for $51.
Secondary capacitors, 3" diameter almost spherical decorative metal cups. From thrift shop. Consider using small rimless mixing bowls from Ikea.
Primary capacitors, 8 x .056mf 2500 volt MMKP capacitors. The type is important because of the high current and voltage. Ebay $20
Brass rod inserted into the first foot or so to make the tubing more rigid to support the coil. Ebay $20
Scrap oak wood.
Neon Sign Transformer. 12000v 30ma. donated. Most modern ones won't work but there are apparently exceptions like this one for $205, delivered, on Amazon:. Allanson 101530-120 volt Uni-Service Neon Transformer. It may need modified.
3 Cabinet oblong knobs for spark gap. Gap is set by rotating the knobs. $12. Their bases sit inside bottle caps for insulation.
Cigar box.
Insulators - 2 are a type used on older electric fences. Plus 4 unusual insulators I had collected.
Resistors - 10 meg. 1/4 watt.
Lamp frosted glass shade. Home Depot about $15
Computer cooling fan. Salvaged. Its a 12v fan driven at 19v from an spare laptop power adapter. I had a better cyclone style fan but I ruined it with debris from steel wool.