Search for Secondary Coil in Topics


Tesla coil secondary coil Answered

Hello! I have been trying to make a tesla coil, and made a secondary coil but ran into a problem. Or rather, what could be a problem. The wraps overlap each other often, and I don't know if that is OK. it is mostly smooth, but I was just wondering if it will still work. Thanks!

Question by Cheesey125    |  last reply


Tesla coil, secondary?

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


Tesla Coil Grounding? Answered

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


Tesla coil? Answered

What gauge wire do I use for my secondary coil

Question by wiccakingkamui    |  last reply


Secondary coil, tesla coil?

Do I wind my secondary coil in the same direction as primary coil?

Question by wiccakingkamui    |  last reply


is there any electrical connection between toroid and the secondary winding in Tesla Coil? Answered

i have secondary on a 2.5 inch PVC and my toroid is made of aluminum duct .  now i want to know whether there is any electrical connection between these 2 ?

Question by sudhanshu529    |  last reply


Help with building a tesla coil? Answered

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


TESLA COIL!!!

Hi guys, i was wondering if i could make a small tesla coil with transformer from Personal computer(15o-230 AC to DC 5V), home made capacitors and a whole 12inch cylindrical shape with copper wire (secondary coil). for my school project... i was able to find this... some information online..but more information will be highly obliged!! if there is any other easier way of making ..say for without transformer will be great..

Topic by f22archrer    |  last reply


How do I find the secondary current of a DRSSTC Tesla Coil?

I need to know the secondary current to determine what turns value to use for a feedback current transformer in the driver circuit.  The secondary capacitance, if that has anything to do with this, is 6.9424 pF.

Question by UbuntuNinja    |  last reply


Pancake Coil

Hello, I was going to try building an old Tesla "Pancake" Coil, and then write an instructable for it. (please don't steal my idea!) Does anyone have any information or building techniques at all that they can give me to help? The Pancake coil is just a Tesla Coil that has a flat secondary, as well as a flat primary. Tesla used it in his early radio and wireless power transmission research. The primary circuit should be pretty much the same as a conventional Tesla Coil. But I am a bit confused as to how to build the secondary. A few questions I have: What wire gauge should I use (I'm pretty sure that Tesla didn't use magnet wire for this)? How do I determine the space in between the turns? (more to come) I realize that most people don't build these kinds of coils anymore, and therefore most people probably won't be able to answer my questions or give me any info; I'd just thought that I would try and see if any one could. It would help me a lot. Thank you.

Topic by ElectricUmbrella    |  last reply


Tesla Coil Secondary Winding Question?

Just curious, I'm working on a Tesla coil and I've run out of wire 1/2 way down the secondary coil. Does anyone think I could just continue winding with another spool of wire and solder the 2 ends together?  Thanks!

Question by transistorguy    |  last reply


First Tesla Coil Answered

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


if you run out of wire on a tesla coils secondary coil can you just solder on a slightly larger wire? Answered

I am making a mini tesla coil and i ran out of wire for the secondary coil and i'm wondering if its possible to just take a slightly thicker piece of wire and solder it on and keep going

Question by josh1324    |  last reply


Mini tesla coil? Answered

Is it possible to make a small tesla coil with a toilet paper roll for the secondary coil?

Question by josh1324    |  last reply



Can I use #14 solid copper with THHN insulation as my winding wire for the secondary on a Tesla Coil?

I have a roll (500 feet) of #14 solid wire with THHN insulation and would like to use it as my secondary winding on a Tesla Coil for a school project.

Question by mbrown1465    |  last reply


tesla coil not working :(?

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


tesla coil grounding?

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



Does it matter how a coil is wound? Answered

Hi everyone, Take a look at the illustration attached.  Is there any real difference in values between the four winding types? *** Assuming same core, same wire gauge and same number of windings on all 4 primaries, and all 4 secondaries *** A) Both primary and secondary are wound TOGETHER. B) primary is wound first, then secondary wound ON TOP. C) Primary and secondary are wound at OPPOSITE SIDES of the core . D) Primary and secondary are wound next to each other on the SAME SIDE of the core. Note that figure in D it seems like the wires are thinner, but I assure you, that's an optical illusion, and the gauge is the same in all 4 figures :-p Again, the question is whether the 4 coils would act the same in a circuit, or is there a difference in values between them? Thanks!

Question by Morgantao    |  last reply


Split Tesla coils anyone?!

I am collecting data in the form of old pics, patents, newpaper and magazine articles as well as just doing things.Tesla coils are fun but is anyone experimenting with the original "multiplying transformer" that Tesla created?And before you say, sure I have a Tesla coil......I mean:Large diameter primary coil with one part of the secondary in very close proximity while the other half of the secondary is located at the center ;)

Topic by Downunder35m    |  last reply


Question about winding coils.? Answered

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


How do I determine how to best couple the primary coil of a Tesla Coil to the secondary coil?

I need to know what the best dimensions for the primary coil would be for this secondary: 505 mm length 0.72 mm wire thickness (21 gauge magnet wire) and 60.325 mm diameter I would appreciate some sort of formula where i can just substitute the primary voltage and get a measurement but if that is not possible use 27 volts for the primary voltage. If you have suggestions as to other aspects of the coil i could improve, i would be happy to listen. It is a solid state coil and i will probably put a capacitor in series with the primary to make it doubly resonant.

Question by UbuntuNinja    |  last reply


Trying to make a dc , ignition coil powered tesla coil , but output at the secondary is very very poor,approx 500 volts Answered

Iam trying to build a dc powered tesla coil, for that i've make use of ignition coil of  scooter or motorbike driven from a fan dimmer and mica capacitors, it works very well and gives powerful sparks the output is fed to the 4 salt water capacitors the primary is wounded in a 4 inch pvc pipe with 10 and half turns , and secondary is 28 swg on a 1.5 inch pvc pipe of lenghth approx 2 feet, but it gives too much week output sparks at the top load , give me some suitable solution , i have chosen this as my final year major project?

Question by satnamj _upgrade    |  last reply


Resonating my tesla coil? Answered

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


Question about a flyback's polarity Answered

Hello, I am confused with this flyback transformer I have. I have a pulsed DC input on the primary coil (pulses from 0 to 15V) and that creates high voltage in the secondary coil. When I connect that input in the opposite direction (wrong polarity) I don't get high voltage any more. The possible explanation for this is that the primary coil has a diode in series with it. Now, I'm confused by this because I tested if there actually Was a diode in there (by connecting a DC supply and a DC motor, in series with the coil) and the motor always works! (also tested with a halogen light) I put the coil in series with the motor to test if there is a diode inside. If there would be one inside, the motor should not work in one of the two cases, when I switch the pins of the primary coil. So, as the results of the test tell me: there is no diode in series with the primary coil. could it be possible that there is a diode in parallel with the primary coil? If that's not possible, how come the flyback is not working when I connect the polarity incorrectly? Could someone please help me out with this? Thanks, Electorials

Question by DELETED_Electorials    |  last reply


make a transformer? Answered

I am wondering how to make a homemade transformer for an early tesla coil (the kind with the flat primary and secondary coils). Thanks in advance, Josh1324

Question by josh1324    |  last reply


Myler Capacitor for Tesla coil? Answered

http://www.electroncomponents.com/Mini-Components/capacitor/Polyester-Myler-Capacitors/105-400v-1uf-1000nf-myler-capacitor Is this good for a SGTC? im using a flyback transformer powered  with ZVS driver running of 30v. So im thinking of putting 60 of these is series and nothing in parallel. The secondary is 16inch long and 4 inch dia. Flat primary with 7 turns.

Question by jasshopper    |  last reply


How to improve tesla coil ? Answered

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


Need some help with my topload

Hey coilers,                     I have recently completed a tesla coil, but im having some trouble with the topload. I built a toriod of automotive preheat flex duct. It helped to increase the spark length from around 1-1/2 inches to 4-5 inches. The problem is, it is discharging from the secondary coil to the primary, ive tried a couple different things an it does the same thing. If anyone can help or has some useful tips or advice, they would be very much appreciated. Many thanks in advance.

Question by Seth the Man    |  last reply


what determines the max current that can be drawn from a transformer's secondary coil?

How could i figure out what the max current i can get out of a transformers secondary coil? example: a welding transformer

Question by twenglish1    |  last reply


Resonant of Solid stat tesla coil ? Answered

Dear All.. I search on the net some sites to learn how the SSTC work. But my English is no good  I do not understand all as the author says. So please could you help me to know: -Primary and secondary SSTC sides  must be tuned to the same resonant frequency as SGTC ? -Or only the second coil is necessarily tuning? Thank you in advance for your time.

Question by lam    |  last reply


Hi I am building a TeslaCoil with MOT and would like some advise. Have four 2000v MOT and 4 2100 capacitors from the MO

Ok, well I took apart 4 Microwave Ovens and I took the MOT and Capacitors. I already built the secondary with a 4" PVC pipe about 4 feet tall and I bought the primary (copper tube). I am using a fan from MO for my spark gap so it will rotate and cool at the same time. Want some advise on this build before i post it as an instructable. I read somewhere that I need to add something to block MOT's from sucking in too much current. Any help would be great. Thanks

Question by arenavles    |  last reply


Why do primary coils differ in shape and location between different Tesla Coils? Answered

I've been researching Tesla Coils, and one thing in particular strikes me, no one seems to agree on a shape and placement for the primary coil. I've seen reverse cone, cylinder, perpendicular spiral, and just wrapped haphazard. You can see which coil is primary in the following images, as well as examples of different styles of wrapping for the coils.  I've also seen the primary coil placed at the base of the secondary, as well as in the center of the secondary. I've gathered the following information in my research (I'm pretty sure everything is correct): The primary coils, through induction, transfers the charge to the secondary coils. The primary coils are much thicker to allow for the large amounts of current running through them. For maximum induction, you want the same amount of surface area for primary and secondary coils (I've seen this written in different ways at different places).  (You don't not want Maximum Induction see: steveastrouk's comment below) Primary coils are placed in a way to allow for....... (this is where things start to fall off and the reason for my question). So, if your goal is to have the most charge transfered from one coil to another, why are there so many different styles? Does one style benefit over another? Is there a logical reason one would opt for one one style rather then another? Thank you. Image Credits: Image 1: parts information Image 2 & 3: cylinder and cylinder centered Image 4: wrapped haphazard Image 5: reverse cone Image 6: not sure Image 7: perpendicular spiral

Question by StumpChunkman    |  last reply


How do I fix my tesla coil? Answered

My tesla isn't working, and I just want to see if anyone sees a problem. * NST voltage: 10,000 Volts 30 mA * 12 AWG connections wire (radio shack) * 15 feet primary copper tubing * 900 feet secondary winding * Aluminum ducking top load (18 inch diameter) * 12 0.22 uF 2000 volt capacitors (total: 12,000  volts, 0.0073 uF) * 2mm spacing spark gap * ground rod: metal knitting needle If you need more information, just ask (pictures below). Thanks for your help! (I need it to work in half a month)

Question by Comhippy    |  last reply


Can I driver a transformer in multi primary coil? Answered

I have my flyback transformer. I use a CFL ballast to test the primary coil pinout I found (Pin 1,Pin 2) , (Pin 1,Pin 3) , (Pin 1,Pin 4) is the primary coil pinout Can I drive it with multi primary coil to get maxium voltage of it

Question by james34602    |  last reply


My First Tesla Coil!

I just made my first tesla coil, it stands only about 6 inches tall and has a diameter of ~1". The tank capacitence is ~940 pF. The wire gauge is 30. The topload is 6 inches in diamerer and 1 inch tall. the power supply is a 7.5kv, 60mA NST with a terry filter. It's a static spark gap. The primary has 13 turns of 14 gauge wire, it's a 30 degree cone.It gives out nice arcs and cornea. I will post photos and video soon, as my workshop reeks of ozone right now.I can probably get better preformance with using thicker (or no) aligator clips (prototype stage right now) and if I change the primary. The wire got too hard to turn, so near the center there's like 2" of leeway on all sides of the secondary... sorry about sound quality in the videothe rod in the video is kinda grounded. The rod you see is a thin copper pipe taped to a 3 foot, 1/4 inch thick dowel rod that I'm holding onto.

Topic by guyfrom7up    |  last reply


What's the proper transformer for a mini tesla coil with no nst? Answered

The wire I had for the secondary coil coolness 65 feet and the primary is vertically wound around the secondary I think a neon sign trans is to high voltage maybe if I build the right cap it'll work or do you think I should do.d a smaller one. And I want it to wirelesslypower a fluorescent light also if without the best can I build the receiver take its energy useable for more electronocs

Question by wiccakingkamui    |  last reply


Could a phototransistor be used to trigger a somewhat high voltage capacitor discharge? Answered

Or would it require a secondary switching mechanism?  I am trying to build a light trigger circuit that is as simple as possible.  I have an idea to use an ir led across from an ir phototransistor  and have it trigger when the light is blocked.  I need it to run 450v through.  is there a phototransistor that can do this and if not what might be a better idea? Edit:  This is to trigger a secondary acceleration coil in a coilgun.  I am leery of using a relay for it because i don't know if that will cause too much of a delay.

Question by finfan7    |  last reply


Transformer Technicalities?

Hey guys I need some help from the experts. I am building the microwave transformer ark welder instructable. I have acquired my microwave transformer, and rewound the secondarys. Now here's where it get interesting. I stay in South Africa, and we have 220v, 15amps coming out of the wall. So I figured with so much wall power I probably only need one transformer, cos I already have too many amps (on paper). So from what I understand, I will be putting 3300watts(220v*15Amps) into this transformer. Another interesting detail is that I think my transformer has 200 turns! I put 16 turns on the secondary (although there is space for more, I just don't have a piece of wire long enough). Which means that my out put voltage will be 17.6v, and 187Amps! Ahhhhhh!!!! If I wind a few more turns on the secondary, I could probably squeeze 25 on there, that will bring my output voltage to 27.5v and 120 amps. Which seems like quite a lot? So here's my question: Will this work? If not, and things go bad, what will happen? Is there any chance that the primary coils will melt, or is it only the secondarys that will do that? I don't really want to destroy my transformer, because they are really hard to get here. South Africans won't give you snow in winter. I had to buy a broken microwave! One idea I had: I have a single coil wrapped around a plate iron core, it looks just like a transformer but with only one set of windings. The thing is as big as the microwave transformer, its wire is of a slightly thicker gauge, and it probably has about 600 turns on it (it belonged to a florescent light setup). I thought I could connect this up to the secondary winding, maybe it will bring the amps down, and also serve as an inductor/ark stabilizer. But I'm just guessing, I'm a complete noob to electronics!?

Question by lenny25    |  last reply


Tesla coil configuration. Audio amplifier power supply?

If I am to use an audio amplifier as a power supply for a Tesla coil could I do without a spark gap and primary capacitor? I will be operating the coil within the audible spectrum (1Hz - 20KHz) so an amplifier fits the bill. It's a 2 channel magnetic field power amplifier rated for 750W per channel. That's 750RMS not 750IFL. (If lightning strikes) The current would flow as follows: Power Amp> 4ohm Load> NST 5000v 60ma> RF Choke> Primary Coil> Secondary Coil 1. Do I need a capacitor bank between the RFC and the primary? 2. Can a few feet of 28AWG galvanized steel wire act as a reliable resistor for the 300W current? What about 750W? If not, what can I substitute? 3. Can the amp hold together? I need it in one piece. Please point out the flaws. Thank you

Question by imMrDude  


Can I modify a Microwave Oven Transformer into high voltage?

Can I modify a Microwave Oven Transformer into high voltage? I had a MOT. secondary coil: 2kV output I heard some people in internet were modify the MOT into high current Can I modify the MOT Primary Coil into a few turns. Just like this formula : Vs/Vp = Ns/Np The original is : Vs/Vp = Ns/Np      2000/220 = 2000/220 In my imagine : 30 turns heavy primay New one : Vs/Vp = Ns/Np       Vs/220 = 2000/30     Vs=14 666.6667 Can I do this?????????????????????

Question by james34602    |  last reply


How to scale a micro ammeter?

I need to measure the current of a Tesla coils secondary output and have found that it is under 1mA and above 50uA so how can I scale a 50uA DC micro ammeter or a DC milliammeter (can't remember its range) to the appropriate range?

Question by The MadScientist    |  last reply


Can you insulate the primary coil of a Tesla coil?

Hello,    I am trying to build a tesla coil using a new design relating to a thesis paper I am working on. Due to spacial restraints my primary coil will be close to the secondary coil. I know I have seen others use insulated braided copper wire as their primary. I want to stay with 1/4" copper tubing if at all possible so I wanted to ask what affects it would have if I used heat shrink tubing on the copper tubing. I am aware the higher frequency voltage runs along the skin of the tubing since that is least resistive at that point. A for the power and caps I am using the following: three NSTs of which two are 15kv @ 30 miliamps and one 12kv @ 30 miliamps, 13 CD 2000VDC @ .15nf caps on each 15kv NST and 10 of the same caps on the 12kv NST. The spark gap is static for now.  I want to prevent arching as much as possible in the small space. Any advice is greatly appreciated. Some of the information relating to the thesis paper I cannot release due to a serious concern of being scooped before publication.  Thank you. :)

Topic by XsFacade    |  last reply


Ideas for creating a portable Tesla coil

I am in the process of planning a small-ish Tesla coil that can fit inside of a medium-sized hard shell suitcase. I would like to be able to power it without using a wall outlet, which most likely means with 6v lantern batteries or 12v lawnmower batteries, but if you have any other suggestions I'd be glad to hear them. I would prefer to keep the coil as simple as possible and maintain a spark gap configuration rather than a solid-state one because I am not very good at soldering small parts. I was thinking about using a neon transformer from a set of car under lights such as these http://www.amazing1.com/profneon.htm (is there anything there which would work especially well?) or perhaps a modified ignition coil with a mechanical interrupter, similar to a Ruhmkorff coil (I have no idea how I would do this, but it sounds like it would work). Your thoughts? Also, instructions on how to construct a flat 'pancake-style' secondary could be beneficial.

Question by Justin the Red    |  last reply


Is this the right way to make a 2 MOTstack and is this the right way to ballast it with a MOT? for a tesla coil?

I just want to be a 100% sure that i did this right before i plug this thing in, because i don't want to kill the transformers or myself :D So if you guys could confirm that i did this right (or not and if not why) i might feel a bit more comfortable :) thanks for all the help! love this community and tesla coils! explanation: powersupply: 2 mots with the secondaries placed in series while the primaries are paralleled ballast: 1 mot with the secondary shorted (both ends to the core) and grounded to the mains ground the neutral wire from the mains is directly connected to the 2motstacks first primary while the hot wire from the mains is connected to the ballast it's primary and then to the 2motstacks first primary finally i taped one 2000V terminal to the wooden box and the other 2000v terminal to a 4ft PVC pipe that acts as a chickenstick Did i do this correctly? here is the picture with explanation from what i did

Question by colinbarnes    |  last reply


A Question about transformer? Answered

In transformer formula , the primary turns and secondary turns affect the voltage and current directly. Why some transformer output voltage is affect by frequency and core type , just like Flyback Transformer(LOPT) and Tesla Coil specifically is Solid State Tesla Coil?

Question by james34602    |  last reply


How do I build an inductive charger?

      Sorry for making the initial question so generic. The basic concept I'm addressing is inductive charging but in perhaps an interesting fashion. I'm working on a school project and my idea is to build an inductive charger for my cell phone (and other devices) that is powered by my car's 12V accessory outlet. I know that I need to have a time-varying signal (AC) to create a time-varying magnetic field in order to transfer energy between the two inductive coils. I'll lay out what I've considered / calculated so far and any help would be greatly appreciated.       I am going to use a cheap DC-to-AC inverter to go from 12VDC to 120VAC, single phase, modulated sine wave (per the inverter's specs). For the inductive coils, I'm using magnet wire from Radioshack and Fry's. The primary coil has 40 turns with a radius of 3.45 cm. It is wound in a solenoidal shape with a length of 2.5 cm. The wire gauge is 24 which has an approximate current limit rating of 0.577 A. The secondary coil has 30 turns with a radius of 2.9 cm. It is also wound in a solenoidal shape with a lenth of 2.2 cm.  The wire gauge is 22 which has an approximate current limit rating of 0.92 A. Both coils are wound around PVC pipe couplings as they were the only round, cheap forms that I could find to wind my coils on. I have been unable to find any data online regarding permeability of PVC or how it would / will impact magnetic field induction. Any information on this matter would be greatly appreciated.         Continuing on to the secondary coil side, if I understand it correctly, due to the turn ratio of 40 over 30, the output voltage would be approximately 90 VAC. Is this correct? For the output current, I've found that it is dependent upon # of turns, distance from primary coil, and loop radius. I know that orientation of the secondary coil relative to the primary coil also greatly influences this but I intend to place the secondary inside of the primary.       I used the simplified magnetic field equation of B = µ I / 2 R to calculate the approximate field strength at the center of the secondary coil. Based on this calculation, if my input current is 500 mA  I get the following: (12.57e-7)(40*0.5)/(2*0.0345) = 3.643e-4 T --> 3.643e-4 = (12.57e-7)(30 * Io )/(2*0.029) --> Io = 560 mA.   Do these calculations look on par with what I should be getting? So my Vi = 120 VAC Ii = 500 mA and Vo = 90 VAC and Io = 560 mA.  From the secondary coil I plan to use a bridge rectifier to convert to DC and then drop down to 5VDC.  Ultimately I would like to get 5VDC @ 500+ mA on the output to meet USB standards.  How does this plan appear? Are there things that I am missing? Are there things that I don't need? Again, any and all help is welcomed and appreciated. Thanks.

Question by AMNunnally    |  last reply


What Capacitor size for a 4 stack MOT Tesla coil?

I have just bought a 4 stack MOT transformer in a case and oil filled it says 8.6kv on it but no idea of amperage, I have a large variable ballast and hooked it up to my test jacobs ladder and it pulls about 10amp and really fires the ladder well. My coil has a 6inch by 29inch winding on the secondary and a Synchronous spark gap (200bps) but I cant seem to get a decent spark off it I have an MMC of 44.0nF @20kv at the moment 

Question by GordieO1    |  last reply


how to fix the broken pins of fly-back transformer?

I have broken the primary & secondary coil pins of a fly-back transformer and i need to repair it. can anyone help?

Question by ferraririder123    |  last reply