Do I wind my secondary coil in the same direction as primary coil?
Question by wiccakingkamui | last reply
HiI am planning to build a small (length about 15 cm) portable coil gun. There are some really good intructables out there. (I still don't have enough knowledge of how to build this thing) I found this site to be pretty interesting. http://www.jeffhove.com/robots/coilgunhowto.html How can I make a powerful coil gun like that with capacitors (not that whole blob of camera stuff)? I am hoping that it could be rechargeable, perhaps by a USB connector (5V). But that would not last long right? So I guess by adding some batteries would help. Trying to get this coil gun to the smallest size with a powerful blow. By the way, there is something called EMF that affects the system?Thanks
Topic by J50Nunlimited | last reply
Hi Guys i hope you can help me im in the process of saucing all the part i need for my nixie clock project but the project requires a specific coil please see link: http://za.mouser.com/ProductDetail/Fastron/MESC-101M-00/?qs=%2fha2pyFadujay2cCU0hcuafg8EcJuL7YYs%2fD4YaFoKs%3d the problem is i cant find this locally is there an alternative i can use ? any help will be appreciated. thanks ps the project is the ArduiNIX : https://www.instructables.com/id/ArduiNIX-Nixie-driver-shield-assembly/
Question by Kira555 | last reply
How would one go about determining the milihenries value of an inductor coil pulled from an amplifier, well different ones I have found. And living up to it's standards, google has found me no information but what an inductor coil is and it's function, but no information on how to find inductance rating.
Topic by Punkguyta | last reply
I've seen a couple of suggestions that an ignition coil, or a decent sizes transformer set up in a similar way, can be discharged into the coil of a coil gun, it the place of the usual capacitor bank. The main advantages seem to be a much faster recharge time, no need to create 200+V, and the availability of parts. I only have 540uF worth of capacitors at 200V, which should work for a small gun, but I have several large transformers, and a crate full of ignition coils. Does anyone know of any reasons why this would not work, or any modifications needed to make this setup work? Thanks in advance for any replies.
Topic by The Skinnerz | last reply
Hi! I made a tesla coil like this guy! https://www.instructables.com/id/Tesla-Coils-for-Dummies/ But I didn't ground the secondary coil of the tesla coil. It seems to work ok without it, but I'd like to see it preform better. Would it help if I grounded it? Thanks!
Question by transistorguy | last reply
I have, what I believe is, a neodymium ring magnet (pictured) that measures approximately 1.6 cm across x 0.3 cm thick and it has an inner diameter of of about 1 cm. I have been debating on what to do with it (also open to suggestions) hence the title. My question is how do I attempt to predict the performance of a coil created with this?
Question by Dauntless | last reply
When I read up on the coils used in power generation, I found that the wire used is a type of magnet copper wire, and I bought 1600 feet of it on ebay. My only problem now is winding the coil. I figure I can do something like wrap it a few hundred times around a pole thats slightly larger than the rare earth disc magnets I got. Anyone have any suggestions? Btw, most of my information is adapted from normal rotating wind power generators.
Topic by fafnir665 | last reply
Hello everyone, I am looking to get some advise. I am building a Tesla coil and cant really get any transformers other than MOT. I have four MOT with all their other components (Capacitors). What I am asking is can I use these MOT wired up in a certain way and I also read somewhere that I would need to add a component to prevent the MOT's from sucking in too much power. If anyone out there can give me some detailed advise it will be great. I just started the build so pictures are coming soon. Thanks in advance to you all
Topic by arenavles | last reply
I am building a tesla coil, the first i have ever built. I know that one side of the secondary coil is supposed to be grounded (the other side being the donut). Problem is, i am not clear where to ground it to. The ground socket on the wall outlet? a nail stuck in the ground? the negative terminal on the first transformer? I'd like to have this straightened out.
Question by cenzo188 | last reply
Hi, I want to build a rotating mechanism powered by a spring. Once released,I need the piece to make 2 rotations in a fraction of a second. I also need it to be quite powerful since it will have to push another piece. For this application, I believe that a coil spring (such as those we can find in clocks) is the best suited, but will it be powerful enough ? An if I use a torsion bar spring, the problem is that I probably won't find one that can make 2 turns.... they are usually designed to be used on small angles only. I would be glad to have your advices ! :)
Topic by 1tibo2. | last reply
Hey guys, I am currently building my first coilgun, first of all, the components: Charging: Disposable camera circuit x 2 2 x D cell batteries Capacitors: 2 x 1200uF 200V 2 x 680uF 200v 2 x 300uF 200V 1 x unknown (attached to camera circuit with no info) Switch: 250V @ 15A - 6 pole toggle (I will upgrade to some for of solid state when I have the money) Now, because I have two of each capacitor I have put one of each into a parallel bank, giving me 2 cap banks with one of each cap, I then connected the two banks in series, I have not done a lot of maths yet which I think I should but I was hoping that would give me 400v which seems to be average. The problem is, it is only charging to 340v tops, I think that may be due to the camera circuits being wired incorrectly. I have the two batteries in series, both charging both of the circuits, then the circuits both charge the caps, the + and - outputs meeting on the caps, am I doing that wrong? Also, does having 300uF caps in series with 1200uF caps hinder the bigger ones? Would I be better of with just the 1200uF and 680uF, or maybe even just the 2 1200uF in series? should I also leave the small cap on the circuit or take that off? Thanks in advance guys, any help would be greatly appreciated. I am having a lot of fun with this project and while I wouldnt like to be on the other end, it is still not as powerful as I would like, even for it's small size.
Topic by TristanD27
My high school recently had an engineering fair, and my friend had built a tesla coil. Its has multiple spark gaps, an RF filter (I think thats what its called), a 120 to 20000v transformer, and toroid top-load, if any of that matters. We/I would entertain ourselves by standing away from the coil and holding a fluorescent tube (by the glass with bare hands, not by the contacts) near the top-load and watching it light up. Even though I was well away from the coil, my forearm muscles would twitch, especially it the coil spark hit the contact on the other side of the tube. Then if anybody touched me, both of us would feel a shock and the same slight twitching (the same kind of twitching you feel from those electric muscle stimulators with the pads you put on sore muscles). We even set up a chain of about 5 people holding hands, and all of us would feel a shock, even though only the first person in the line (aka me) was holding the fluorescent tube near the coil, with my hand on glass, no where within range of the streamers coming from the top-load. Now for my question: is this dangerous? (I know its non-lethal, im talking about my nerves) And what exactly was happening? because it was not an incredibly large coil, and i know that the field of a coil is much larger than the actual streamers. I also read somewhere that insulators dont work the same at incredibly high voltages. I think what I was feeling was the skin effect, and the charge came from the excited electrons in the tube. If my ideas are correct, then wouldn't me holding the tube be just the same as if i had just put my hand near the top-load and let the streamers hit me?
Question by masterbuilder | last reply
Hello. I am currently trying to build a Tesla coil. However, due to a little mistake my MMC only has about 1/4th of the capacitance required to get it to resonate . Now I wonder what the best course of action would be. add a resistor to reduce the amount of amps to 1/4th of its maximum (6000 volt, 5 mA instead of 6000 volt, 20 mA), and thus the capacity required for resonance (I have a variable resistor here). Or just run it with full power, which would mean it would most likely not function as good as it could (spark gap fires 4 times where it only should fire once) I am currently not capable of adding up extra capacitors to the bank due to a lack of money, but might decide to do this in the furture Help would be appriciated.
Question by kirdaiht | last reply
Today's speakers have large heavy magnets, but what would be the result of setting up two coils which create opposing fields, one being the typical voice coil, the other being a replacement for the magnet. Why isn't this in use today, is the power needed to create the required field just too great? This method could be used to increase volume while not overloading the voice coil right?
Question by seedorfj | last reply
What kind of multimeter would measure the output in volts and the frequency of my secondary. It totalling in height is 22.7inch with a 3.5168inch diameter. Primary applied voltage 13.66kv with a distance of .5in between primary coil and secondary
Question by wiccakingkamui | last reply
Hii.... a few days back i constructed a tesla coil .... the spark gap fired ... but there was no activity in the secondary ... no sparks or anything ... :( ... please advice me ... what could be the error ?? i tried tuning by changing the taping of primary ..... but no effect ...
Question by sudhanshu529 | last reply
I would like to know how this http://4hv.org/e107_plugins/forum/forum_viewtopic.php?36853.post can be made? I tried to make it using the pdf that was attached but i failed. I have included pics of my failure http://4hv.org/e107_plugins/forum/forum_viewtopic.php?99090 Can somebody please help me?
Question by deathnoteviewer | last reply
I purchased a small tesla coil kit online. The kit is working but I need help improving it. Instead of having the typical primary and secondary windings with a toroid on top it has the driver circuit pulse a 50k transformer producing a 1 inch spark. I'm wondering can the output of the transformer be connect to a typical primary windings and secondary windings with a toroid on top? I have a link below to the schematic. Also if this works would you recommend 1000 or 2000 turns on the secondary and how many on the primary? 30 or 36 gauge for the secondary? Link to schematic http://i92.photobucket.com/albums/l23/tucsoninsurance/Public%20Album/20130925_203001_zpse3c1927d.jpg Here is a link to the tesla coil picture. http://i92.photobucket.com/albums/l23/tucsoninsurance/Public%20Album/20130925_203600_zpsc84f3177.jpg Thanks for your help.
Question by mpatti75 | last reply
Im going to try to keep this short. So a friend and I are both sophomores at our highschool and we are both in chemistry (which is a higher level science) and i built a coilgun for last years project and attempted to build a PWM driven one this year. My friend and I want to build a rather large coilgun using either 10 microwave oven caps or close to 40 or 50 caps from computer power supplies. What i need help on is whether we should use the microwave caps which are high voltage but low capacitance or the power supply caps which are 200 volts and around 500 micro farads. I also need help on what wire to use for my coil and how many turns for the coil. i would like help with a coil for each cap size. We are planning on using either a 3millimeter by 5 centimeter long steel rod or a quarter inch bolt. our goal is to at least shoot it through the wall of the physics classroom and maybe through the door of a car. anything helps. Thank you
Question by budhaztm | last reply
Alright, I ask that everyone please read everything in this question before answering :). I hopefully going to be very thorough. I am building a tesla coil and am just about to give up and buy a NST. I have many high voltage sources laying around, but, so far I haven't had much luck. The first plan was to use a large ballast (florescent light) to drive a flyback, but it was to powerful, so I got a CFL driver, and it didn't work (not the driver so much as the whole project) so now I am left with an ignition coil. I know that I can use a light dimmer switch to power it, but it will still be 60hz I think and I here that is not safe for a tesla coil. Although, I don't think anyone is going to let high frequency and voltage arc across their skin anyway. So will something at this low of a frequency still work to power a tesla coil. If not do you have any ideas I can use. I have a flyback transformer and an ignition coil so any ideas that come to mind please share.
Question by jj.inc | last reply
My coil is made of 22 gauge wire and the inside diameter is about 1/8 in. It's 1 3/4 in long with about 7 layers. The ammunition is a little over an inch and fits snugly inside the coil. How many more layers should I make it, and what else can I do to improve it?
Question by cardboarddude | last reply
So i need to wind some coils, and i suddenly though about it, and now i need to know if im on the right track. When winding coils, will winding the second layer, back over the first layer, in the same direction (for example clock wise) cancel out the coil? also, i bought a galvaniced threaded rod, thinking it would work as a core. it would work right? What if i had a 8 turn primary. Should it be under the secondary coil. Or could i wind the secondary to the side of the primary? thanks :)
Question by dumle29 | last reply
Ok so i am in the middle of making a coil gun i am using a disposable camera flash circuit at the charger for the capacitors an i can get it to work but i dont think i did it right for the reason it being the projectile comes out of the tube slowly and or sometimes flys back at me.... if anyone has some answers it would be a great help or even a whole new idea would be awesome to.... i love learning new things
Question by jjohnson-9 | last reply
Hi. I am trying to build a Tesla Coil, and there are few thins I'd like to know. First, I built this PWM (made a few modifications, IRF530 MOSFET and 10nF ceramic caps instead) and connected it to a self wound primary of my fuh29A001V flyback, and it works perfectly, sparks and stuff. Can this power my Tesla Coil? Next, if it can work, how do I calculate capacitance needed for my tank capacitor? Miloš
Question by Mvtnns
I have heard a little about resonating a tesla coil and wan't to make sure that it is going to before I spend money for my primary (copper is expensive). My secondary has about 1400 turns of wire. I am going to be using a bucket capacitor like The Geek Group on youtube built, and a 60 Hz high voltage transformer. My primary will hopefully be 1/4 inch, and I wan't to know how many turns I need and if I can do a funnel looking shape like this one Tesla Coil. One other thing is that my tesla coil is 30 inches tall, so does my primary need to get closer to the top to work. I think I got all of the primaries and secondaries right, I know which is which, but sometimes I swap the words. It would be a great help if you answered my question.
Question by jj.inc | last reply
When i make a coil with magnet wire,i have enamelled wire, do i have to sand the whole thing so the copper touches in the coil, or just the ends going to where im hooking it up? EDIT: i changed my title, because i have more questions about coil guns in general.
Topic by um0123 | last reply
I am currently creating a coil gun within a small nerf pistol. Everything is going well, it all fits within the gun quite nicely actually. But one problem I've realized is that there is nothing keeping the ammo within the barrel (a bic pen tube) I would like to hear some ideas on how to keep the ammunition (which is currently undecided, if that helps. I'm considering either small steel balls or nails) within the barrel until the coil is activated. It is worth noting that because of the design of this particular gun, the trigger is not a lever, but instead a simple sliding mechanism that hits a button situated right behind it. One option I'm considering is using an electromagnet hooked up to a NC (normally closed) switch also hooked up to the trigger. The magnet would keep the ammunition in place, and pulling the trigger would turn it off. I have already added a sliding switch to turn on and off the gun, and I could wire the second magnet to that switch as well. The complication I foresee arising from that is that the electromagnet may still have residual magnetism for a few milliseconds, which could hold the ammunition in place for longer than it takes the capacitors to discharge. thoughts?
Topic by berky93 | last reply
I built a tesla coil, but the output is just a little spark barely visible when i approach a screwdriver to it. primary is 5 turns secondary 500t capacitor is made from 2 layden jars spark gap is about 3mm the coil is about 15cm tall the power supply is a flyback transformer driven by the zvs at 12v What do I have to do to improve it?
Question by theVader75 | last reply
In my coil gun project I have 36 330v 120 uf flash capacitors. When I had them arranged in 4 banks of 9 linked together in series (.5*1200*1200*1000e-6 = 720J) the projectile could easily punch through cardboard. But when I tried to increase the power by making 7 banks of 5 giving me (.5*2100*2100*500e-6 = 1100J) the projectile has trouble getting through cardboard. The coil I am using is 50 feet of 22 gauge wire. Is there any thing that I am missing? Thanks.
Question by eskibro830
I asked a similar question https://www.instructables.com/answers/How-to-improve-tesla-coil-/ and I still didn't managed to get a spark. I want the simplest way to build and power this tesla coil Now I have : -5 layden jars -1 MMC -1 primary 5t -1sec 500t -1 zvs (dc out at 30kv) -1 ignition coil -5 timers -1 MOT -2 capacitors for MOT at 0.98uF -2 diodes for MOT
Question by theVader75 | last reply
Ok so i made this coil gun using a camera flash circuit but im using 450V caps so the circuit only charges to about 330V how would i step up the voltage in a cheap way. Buy another camera circuit or build one? If you need any more info just ask and thank you.
Question by rocket_man
I want to build a tesla coil, but I want to verify with the instructables community that it won't blow up, burn down my house, turn into skynet, etc. Here's my plaaaauuuuuuhn: For the transformer, I'll be using an old negative ion generator thing that takes in 120VAC and outputs 7.5kv(pic). For the primary, I'll use old speaker wire in a cone shape (possibly using acrylic). For the secondary, I'll use 32- gauge magnet wire (pic). And for the spark gap, I'll use two bolts in a box, possibly with a computer fan cooling it. And for the capacitors, I'll just use an array of Leyden jars. My questions: 1. What diameter should the coil form be? I have some random white tubing which has an OD of 1/2 inches, 1/2 PVC piping (which actually has an OD of 7/8 inches), and 3/4 inch PVC piping. And is there a better alternative to these? 2. Should I use chokes on the input/output of my transformer? For those, I think I'll just wrap a bunch of wire around a pen. 3. Should I varnish it? 4. How powerful will the EM be from this thing? Exploding computers aren't that good. If I have made any errrors, please tell me.
Question by Shagglepuff | last reply
Ignoring resonance what should the average capacitance of a Tesla coil tank capacitor be? In what appliances can you find large high voltage capacitors, preferably above 10nF? And can you use microwave capacitors in series for a Tesla coil tank capacitor?
Question by The MadScientist | last reply
So I bought one of these to play with: http://www.ebay.com/itm/130935883579 The transmitter board always gets really hot and smells faintly of something burning. Is this normal? Should I use some type of heat sink? Anyway, I discovered that you can add another coil of the same-ish size to the transmitter, and both coils will work. However, if I remove the coil and add a single coil twice the size, it does not work. I'm curious as to why. What determines how large the coil can be?
Topic by aliasjanedoe | last reply