This Instructable will walk you through building a medium sized Tesla coil.
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Step 1: DANGER
Unlike some other high voltage experiments, a Tesla coil's streamers can be very harmful. If you are shocked by the streamers, you will not feel pain, but your circulatory and nervous system can sustain severe damage. DO NOT TOUCH IT WHILE ON UNDER ANY CIRCUMSTANCES.
Also, I don't take any responsibility for you hurting yourself.
This isn't to say that you shouldn't get into high voltage though, its just that if you are planning for this to be your first HV project, its a little to involved. Instead, try out a nice microwave oven transformer, and be safe!
Step 2: Gather the Materials
- A length of 1.5" PVC (the longer the better)
- About 300 feet of 24 AWG copper enameled wire
- 1.5" PVC screw-thing (see picture)
- 1.5" metal floor flange with threads
- Spray on enamel
- Circular, smooth metallic object for the discharge terminal
- Various pieces of wood
- Long bolts, nuts, and washers
- About 10 feet of thin copper tubing
- 6 Glass bottles (Snapple bottles work really well)
- Table Salt
- Oil (I used canola. Mineral oil (horse laxative) it preferable as it doesn't mold, but I didn't have any.)
- Lots of aluminum foil
Step 3: Wind the Secondary
- I built a rig for winding my coil that consisted of a microwave turntable motor (3 RPM) and a ball bearing.
- Use a small block of wood with a notch in it to straighten the wire and tighten the coil.
Step 4: Prepare the Bases and Wind the Primary
Align the metal stand in the center of the bottom board and drill holes for bolts to go through. attach the bolts tightly upside down. This will allow you to put a base for the primary on top of it. Then bolt the primary's base in. Take your pipe and wind it into a pretty upside down cone (not the flat spiral in the pictures). Then mount it on the supra-base.
Optional was the addition of 2 supports that I zip-tied the primary to.
Forgot to add how to make the spark gap! It is just two bolts in a open-air wooden box, and they are adjustable for tuning, etc. See the last image...
Step 5: Build the Capacitors
I decided to go the cheaper route and build a capacitor. The simplest way is to make a salt water capacitor, using salt water, oil and aluminum foil. Wrap the bottle in foil, and fill it with water. Try to get equal amounts of water in each bottle, as it helps to keep the power output stable. The maximum amount of salt you can put in the water is .359 g/mL, but this ends up being a lot of salt, so you can tone down the amount a lot (I used 5 grams). Just make sure that you use he same amounts on salt and water. Now put a few mL of oil slowly into the bottle. Punch a hole in the top of the cap and put a length of wire in it. You now have one fully functioning capacitor, go make 5 more.
Optional: to keep the bottles in order, make or find a metal crate for them
As Glenn781 pointed out below, 6 Snapple bottles with a 15kV 30mA NST can be deadly! If you are using a NST like his, use 8-12 bottles, not 6!
Step 6: Connect Everything
My Coil's Specs
- 599 Wraps on secondary
- 6.5 Wraps on primary
Step 7: Start It Up!
Step 8: For the Future...
But for now, I'd like to admire other coilers hard work!