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!This instructable is meant to give detailed instructions on building a solid state tesla coil based off of steve ward's mini sstc schematic.
Ok, here's  the disclaimer. 
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   I do not hold any responsibility or your use or misuse of this information, in any way. I am not a trained professional and I cannot protect you from the voltages that are part of this project, and any damage this project may cause, wether it be to animal or material. The user assumes all responsibility for the actions they take.
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   Well, now that that's over, lets get on to what a tesla coil actually is. 
A tesla coil usually has these key components:
*power source
*Switching circuit
*Resonant Capacitor (only for drsstcs, some vttc,s and regular spark gap type coils)
*Primary coil
*Secondary coil
   The tesla coil was invented around 1891 by Nikola Tesla. His original intention for the device was to create a wireless energy distribution system. Unfortunately, his design could not send power at even close to reasonable efficiency, as the power was almost all being wasted on corona and arcing. Today, we coilers take this to an advantage. 
   But what males the tesla coil truly magnificent is the voltage it produces. A typical spark gap type coil takes (usually) the voltage from your wall socket, and steps it up to a couple thousand volts, where it then goes through the switching circuit, through the primary, and is seen on the secondary side as more that 200,000 volts! But how did tesla do this?
   The answer is resonance. A resonant circuit, usually consisting of a capacitor and inductor, is much like a slinky. (stretched out) When you give it a push, it bounces back and forth losing momentum with each pass. However, if you keep hitting it every time it comes back, it will start to move really far back and forth at the same speed. (Or frequency) The frequency at which you hit it is it's resonance.
   The secondary coil is like our spring. But how do we get voltage from it? Certainly not by hitting it. No, you have to use an oscillating magnetic field from the primary coil to excite it. A normal spark gap type TC would use a resonant capacitor and a spark gap to produce the oscillation, where as our coil (sstc) will use feedback from the coil itself to drive the primary. (using an antenna.)
~~for more info on how a tesla coil works, head on over to Richie Burnett's site or the wiki.

Step 1: The Overview

     Our coil will be a solid state type. The schematic we are using was made by steve ward, and belongs to him. This circuit is a relatively simple circuit as far as tesla coils go, and is a good place to start for a coiler that is new to solid state drive. I will say that you should only attempt this if you are confidant that you can work with mains voltage, as this coil does have direct mains voltage running through part of it.
     Unfortunately, I cannot currently put up the steps to wind the secondary coil, but I will put up an intractable as soon as possible. But generally, what you need to do is wind many tight turns of thin magnet wire around a pvc form. Don't make it too tall. A good ratio for height is that the height is about 3 to 5 times the diameter.
    Anyway, what you will get out of this coil is approximately 7-8 inch sparks. (Depending on how you set the interrupter) I'll go over this later, but for now, that is what you can expect. Trust me, you'll have fun.
*****EDIT: That mystery symbol appears because instructables cant handle the µ and Ω symbol in pictures. go figure! it works here.
<p>replace your 0.68uF caps with the resonant caps :) (so you need 2 of them)<br>i skipped the interrupter and used my signal generator for the interruption.<br>low duty cycles on low frequencys are fun!</p>
Are you saying to change that capacitor to a value which would make the primary a resonant circuit at the same frequency as the secondary? Do you have pics of your driver setup?
This is the current Output Driver im using.<br>It's a bit overdone on protection diodes.<br>But seems to work great.<br>and because i made use of the real tank cap values.<br>output is significantly higher.<br><br>you can tune your primary tank by tuning it with 1 tank cap<br>when tuned you just put the second one in and poof it works :)
This mode of operation isnt actually using the primary side caps in resonance. What you may be seeing is closer to zero voltage switching, which can have benifits in allowing more power to be pumped through the fets without thermal damage. In ordet to operate in resonant mode, you would need sognificantly larger caps on the bridge and an actual series resonant capacitor in between the bridge and primary, but be warned, without a proper current monitor circuit, you are likely to blow up your bridge on higher duty cycles and on-times. This is a rather dated instructabel, but there is plenty of better info out there for anyone looking.
Or change the bridge caps to 2 resonant caps :)
Thats not a DRSSTC though, as the primary circuit doesnt ring up. In order to actually be resonant, you need to have a single resonant capacitor (or capacitor bank) in line with the primary, not two strattled to the beidge rails. In the scenario youve described, youve just set your bridge capacitors to limit the current to zero during switching. To actually have resonance, you need to move the resonant cap to be in series with the primary, and either construct an H bridge, or replace the bridge caps with sufficiently large bypass capacitors.
<p>True,<br>It stays a halfbridge resonant.<br>no there is no resonant rise true about that.<br>but getting the right caps in increases the coupling and thus giving better arcs.<br>i've seen the same effect in both the resonant halfbridge you descripe and the one i descripe.<br>for being able to modulate the bus voltage i use my schematic as for modulation you dont want to big of a bus capacitance as when you switch off the arcs decay (wich makes it impossible to get a good modulation over a bus.</p>
<p>Thank you for the schematic. So when you tune your primary with only one cap, are you running the coil with only one capacitor (so current would not flow through the other mosfet)?</p>
I tune my primary with a oscilloscope and a function generator.<br><br>First i connect my secondairy bottom to a function generator + and negative to ground.<br>Send in a square wave and put your probe near secondairy<br>Scroll through the frequencys till it peaks out on the scope.<br><br>Secondly<br>Keep function generator on same frequency.<br>Connect the secondairy bottom to ground.<br>Connect the + funcgen to a 10k <br>10k to 1 side of the tank<br>- funcgen to the other side of the tank<br><br>Connect probe to negative and the other lead inbetween resistor and tank.<br>Then tune primary till you see the secondiary wave on the primary.<br><br>Then its almost good.<br>Then do fine tuning with the coil running on the circuit.<br>Most of the time the right tap on the primary is within a quarter turn.
and what about the secondary? does that have to be in resonance with the circuits or primary or both? or does it keep itself resonant because of self tuning because of the antenna
<p>The primary coil and circuit switch at the resonant frequency of the secondary coil because of feedback from the antenna. The primary and secondary are not switching at the exact same frequency because they are out of phase. In a DRSSTC they are switching at the same frequency, resulting in potentially bigger sparks. Correct me, anyone if I am wrong. </p>
A drsst has a resonant primary LC circuit (self-oscillating) tuned to the same resonant frequency as the secondary circuit. All drsstcs and sstcs have a feedback loop that triggers the actuall switching. The regular sstc differs by not having a resonant tuned LC circuit as the primary. It is simply driven at the same frequency as the secondary, and you do not need to tune an LC circuit.
Imm looking forward to follow this clear and clean tutorial. I am wondering one thing though: <br>How can two switching on/off mosfets produce AC, I have read a lot but cant get how that is possible, that is physically impossible from one way conducting mosfets...
<p>Imagine 2 bully kids pushing a kid real hard back and forth on a swingset, each pushing at just the right time to get the kid swinging very VERY fast!</p><p>That... is this.</p>
<p>Pulsed DC capacitively coupled it creates AC. You could actually do it with 1 MOSFET but using 2 kicks it harder. </p>
<p>If one mosfet is pointing one way while the other is pointing in the opposite direction, and they are switched on and off alternately, then it can create ac.</p>
it doesn't create a.c. but it does start a resonance in the tesla coil, the kHz is just right and it goes back and forth in the secondary coil making thousands of volts with only 2 coils, instead of going one way it comes back and forth
<p>And the secondary is definitely producing AC. </p>
<p>5V USB Portable Tesla Coil<br><br>https://www.youtube.com/watch?v=lZrOns9xqPc<br><br>http://www.ebay.co.uk/sch/shars-stewa/m.html?_nkw=&amp;_armrs=1&amp;_ipg=&amp;_from=</p>
<p>Can i use MUR1560 at </p>The half bridge
Hey I love this, I'm currentally in the middle of building this, Is there a way you could send me an image of the whole bottom of the board? Like all of your solder connections? My email is hockeystar0710@yahoo.com
Very nice instructable on sstc ..keep it up .<br>Can u pleas tell me.is the oscilloscope is important to do this circuit .i recently build the sstc using this site http://www.richieburnett.co.uk/sstate.html<br>But there is no spark at all. Any suggections will be greatly healpful .<br>Thanks in advance :)
<p>I haven't looked at that site very much so I am not sure exactly how that one works, but one thing you could try is flipping the wires for the primary coil. </p>
<p>I made this project, and built the secondary 15'' tall instead of the specified 10''. When I tested it with this coil, the spark was much smaller than I had expected. It also didn't work with a normal sized toroid and I had to use a small one. Did I build the secondary too big? </p>
Thank you for the instructable.
<p>Hy jewelzc4, please which the output voltage and current?</p>
I think my calculations came to about 19kV. kinda hard to test exactly though. And I am sorry but I can't remember the current calculations.
<p>Wow... This looks soo clean and beautiful!</p><p>Can you share your method for making this tesla coil?</p>
<p>Did you use irfp260n or irfp260m because in your picture it is a irfp260m but below</p><p>you wrote irfp260n</p>
<p>Please which the output voltage and current of tesla coil?</p>
<p>could i replace the power supply part with an SMPS from a PC, by using the blue(-12v) wire from it for 12v and white(-5v) as 5v?</p>
<p>Ey dude! Great instructable! One question: why did you leave this apart?</p><p>Thanks in advance</p>
<p>Hey great instructable! One question: If the voltage supply schematic displays a 20V1A transformer why did you use a 25V2A ??? Is there any technical reason or did you just happen to have of of those laying around? Thanks </p>
<p>will this work with a bipolar half bridge</p>
<p>Very cool project!</p>
First of all, GREAT instructable! <br> <br>Second, I have a huge bug that I can't fix. <br> <br>I copied the schematic and made a PCB layout. I solder everything, and made sure the gate transformer was connected correctly. <br>Now, the coil won't produce spark. I use a step-down transformer to step the voltage down to 110 (220-110), and I also put a variable SSR (solid state resistor) to make a cheap variac. The major problem tho, is that the MOSFETS are quickly overheating and shutting down, making the transformer buzz. The odd part is that the MOSFETS are starting to heat up at only 30v. The coil at this point is barely making a park. <br>The coil setup is 4T primary, and secondary 0.35 mm x 1000t on a 75mm acrylic tube. <br> <br>Any help would be greatly appreciate! <br>
<p>I have the exact same problem. Any help from the high-voltage community? Or, if you've figured it out, what was the problem? Thanks ahead of time.</p>
hey, so i noticed your link to the ferrite toroid is sold out, i can probably find one myself, but what are the dimensions or part number? i would hate to get the wrong size.
<p>I believe I used this from Mouser electronics. Mouser part number:875-28B0999-000. But I could only get 15 turns, still worked fine. It's dimensions are 1&quot; O.D. .61&quot; I.D. and .5&quot; length.</p>
The ferrite should be big enough to wrap the wires around it several times.
i am aware... but could you link me to the one YOU got?
and isn't it possible to play music with this? if so how do i do it? <br>
<p>Yes it is. I used this circuit I found for audio. http://wiki.xtronics.com/index.php/File:555c.png</p>
<p>Hello. In the section about the interrupter, what are the potentiometers for and how do I determine what to set the to? All help is greatly appreciated.</p>
<p>They determine the on and off time of the interrupter. If you have an oscilloscope you can build the interrupter circuit and see how they affect the waveform. Just set them somewhere in the middle. Doesn't really matter it will work no matter how they are set. If you get your coil running you can adjust them while its on and you will see and definitely hear the adjustments you make. When I first made this coil I actually used a circuit from the 555 data sheet to make a 50% duty cycle timer as the interrupter. </p>
<p>Thanks for posting this spark light. My first tesla coil. It was definitely a learning experience, and exciting to get that first spark. A note to anyone trying this; if you have a problem along the way read the comments, google and search youtube. A few of my questions were answered that way. I started this project back in November 2013. I have since altered a few things like making a home built torroid for the top (instead of an oil filter wrench in the first photo) and figuring out how to make it play music. I plan on making an instructable as well sometime soon.</p>
hey, I have a question, you put this together in sort of a modular way, but did you put it all together on a board?
<p>hey my mains output is 220v ac so what can i change ?</p><p>should i just step it down to 120 v and continue?</p>
i have a question....i finally got my secondary and prinary coils in resonance and the freq is 750hz how can i test for the freq range...what pins of the cd4046
i have a question....i finally got my secondary and prinary coils in resonance and the freq is 750hz how can i test for the freq range...what pins of the cd4046

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