This Instructable will walk you through building a medium sized Tesla coil.
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
Secondary Coil:
- 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
Tips:
- 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!
http://www.youtube.com/watch?v=iVmX2Ik4ylg
985 Discussions
14 days ago
Just scanned through the comments didn't see if anyone already mentioned this but the pvc screwy thingy is a PVC male adapter.
Question 5 weeks ago
Also if I were to have a 6-8 inch diameter how many Snapple bottles would I need to build my capacitor? Is there anything else that would be more efficient?
Question 5 weeks ago
Do you just stick the wire straight into the bottle? Or do you strip it to just the inside then stick it in the bottle?
2 years ago
In my home, power supplied is 230 V, how can I make tesla coil.
Reply 2 months ago
then buy a NST locally and use that, im in NZ and have 230v supply, and all my coils run on it fine. i reckon it's even better.
Reply 2 years ago
Do not play with 230VAC power... you will die lol. Not funny but, try this it's a bit safer and easier.
Reply 2 years ago
Thats not a Tesla coil it's a slayer exciter. good video though.
1 year ago
what is the spark gap for ? , how wide is it ?
Reply 2 months ago
the spark gap is what charges and discharges the capacitor bank into the primary coil. the width of the spark gap is dependent on the size of the power source and the capacitance of the cap bank, and this width can change the output of the coil as the wider the gap the higher the discharge but the slower the pulse rate. its something you have to tune to your coil.
1 year ago
the wire getting the spark from the secondary coil , where does it go ? where does conect ?
Reply 2 months ago
Earth, and thats what the bottom end of the secondary should be wired to.
Question 1 year ago on Step 2
is it possible to connect a 400kv highvoltage generator to the coil?
Answer 2 months ago
the taser type high voltage sources are DC and not suitable. they use a voltage multiplier to get the high voltage and this make the output DC and this will not work. A tesla coil runs on AC and needs to be HV
2 years ago
In my home, power supplied is 230 V, how can I make tesla coil.
Reply 2 years ago
two things:
1. buy a step-down transformer that steps the voltage down to 115 v but this would be alittle counter-intuitive
2. just get a transformer with the same output specs that has an input of 230 v
The good thing about this project is that it can be inprovised, really, any transformer would work in this project if the output is high enough.
Reply 1 year ago
how much voltage would be the highest you can input??
Reply 2 months ago
15 kv is the normal best from NST, you wont find one bigger.other transformers will go higher but not smart to use unless you know what your doing.
Question 11 months ago on Introduction
could not find one and 1/2 inch PVC, is it possible to use one and 1/4" PVC and if so what is the wraps of the secondary copper wire need to go around it and what size copper tubing? We are trying to make this for a science school project got the ok from the teacher, just need a little help.
Answer 2 months ago
bigger is better, 3/4 to 2" is suitable
Question 9 months ago
Is it possible to run the coil with a 6.5kV 30mA NST? I'm considering purchasing one, and wanted to know if I could run the coil off of it. If not, do you have any suggestions for a better transformer? Thanks.