Search for copper coil in Topics


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


need help for coil gun

I want to make coil for coil gun.i have 21awg copper wire (0.7mm), 250v 10000 microfarad capacitor.How many layer for the best velocity ? 

Question by Rendydevara    |  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


Methods for winding coils

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


how to wind coils to generator?

I am willing to make home made generator what is best shape and way wind the copper coil

Question by pattadkalanil    |  last reply


Tesla coil what am I doing wrong? Answered

Simple question 5000 volt transformer  30 m.a.  shout circuit  two liquid salt water jar caps with coiled copper internally

Question by wiccakingkamui    |  last reply


Paint Plastic To Copper Tubing

I'm making a prop that requires a length of coiled copper tubing & I don't have the cash to buy it. I need a plastic tube that is malleable into a coil & I can spray paint it a copper color. I've experimented with some types of plastic cover electric cord & aquarium tubing & both, the plastic reacted with the paint & never dried.  I need to know what types of plastic tube I can ether paint myself & wont melt the plastic, or point me in the detection of were I can find copper colored plastic tubing, or name the types of plastic tube that wont react to certain types of paint.

Topic by elkaddalek    |  last reply


Coil to give 3 volts

I need 2.5 volts from a coil when a 10mm magnet is passed over. What awg of copper wire and how many turns do I need for an air core coil. This is to charge a super capacitor.

Question by edenordinary    |  last reply


Would it be safe to attach a nichrome coil to copper wire and run electricity through it to make a heating coil?

Obvoiusly I would not electricute or burn myself, I would only leave it on for 20 min at a time and I am thinking about soldering the copper wire to the coil, which would be in a box.

Question by unstructabillies    |  last reply


Is there a problem if my copper coils for an electromagnet are heating up? Answered

 I have built a few little nail style electromagnets and they all heat up.  If there is less power its slower but it still does.  I have experimented by using this heat but on smaller coils it will start to smoke because it is to hot.  This made me wonder if this is a short or actually an apply-able heat source.  On a very large coil heat is generated but not enough to make smoke so is guess that it is actually losing power so it can't be a short. SO CAN I USE THIS METHOD TO MAKE A MUG WARMER OR IS SHORTING OUT THE BATTERY

Question by jj.inc    |  last reply


Does copper wire work well for heating coil? Answered

I want to make a diy hair dryer (https://youtu.be/NyXi30acGO0) however the heat coil is a tricky part. I have seen that video saying you need 32 AWG nichrome wire; and another video similar that uses 25 AWG nichrome wire.  I got an old long ethernet cable, however it uses 25 AWG copper wire.  Does anyone know if copper wire will work well for heat coil?

Question by ADRIANT28    |  last reply


My problem is My MMC burn several time any suggestion?

I built a Tesla Coil,my coil's specification is 5KV NST,2inch Diameter 2ndary coil,10 turn of 4mm copper tube primary and 0.15mfd 2KV capacitor(10KV mmc with 0.030Mfd Capacitance).My MMC burn several time but the coil works fine with Leyden Jar Capacitor .Please Help me!!!!!!

Question by Bumba Lodh    |  last reply


making a coil gun help

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


Copper and magnet electricity generator

For a project in school we are designing a simple electric generator using copper wire and a magnet. The output i'm aiming for is 15V .The fixed criteria for Faraday's law as followsE =( NBA ) / T T= 3 seconds N = adjustable A = adjustable B = Neodymium 1.32 T so how do i chose my copper wire? what diameter? what kind? how do i keep the design not so BIG . How do i increase my voltage output by using a double coil system?

Question by CharithH4    |  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


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


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


Discharging high amounts of amperage in a very short time.

Previously I asked this question, except I wanted to build an electromagnetic dent puller. But no one gave me specific ideas or instruction of how it could be done, instead everyone told me different ways to pull the dent out, or how the metal looks.. Anyway. I have a lot of copper wire. And I have a bunch of magnets and ferrous cores, iron rods.. etc. I am wondering if I can create a very powerful burst of magnetic energy with a few winding's of copper around a ferrous core. I'm talking enough to push two very heavy objects apart, such as a television or couch... 1) Copper will be wound around about 40-60 times 2) High amperage discharge from capacitor bank 3) Possible explosion or melting wire? Thank you... again

Topic by Justdoofus    |  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


What size should i make my copper coil for the size of my magnets!?

Hello fellow people. i am about to make some copper coils to use to create electrcity when i pass my magnets. i am new to this are of work and this is a home project for myself, any information would help greatly, and also some links to youtube videos that are very clear o understand as im not the 'quick' with things i dont understand. so.... i am using 25mm x 10mm x 3mm (lengh/width/depth) neodymuim magnets, rectangular shape, and im using 2mm insulated copper wire. i have purchased 30 of these magnets and am planning to stack them in sets of 4, and have six sets, and idealy make six coils for the magnets to pass, the coils being stationary and the magnets on a peice of wood that rotates via a pully. what size should i make my coils? i understand my coils inside diamiter should be the same size as the longest part of my magnet, ie;25mm, but how wide should my coil be? thats the bit that eludes me, i have added a picture to try help my explanation if this helps, thanks in advance for any information that you can give.

Question by MAR5HM3LL0W    |  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


I need an advice on making electromagnet/solenoid from bare copper coil/other option

Hi, I have in my lab room thick tinted copper wire. I planned using them to make some electromagnet, but fail to find a solution on how to insulated them. At first I thought using those acrylic/enamel can spray, but I am not sure if it would fully insulated them. Would the acrylic/enamel penetrate between the contact gap and insulated them or will it just fail to do so? In fact, I am not even sure if it's a good idea to begin with, because I don't want to actually waste the copper. As an alternate option I thought using those magnet wire from the Microwave Oven transformer, the one with really thick diameter. I would uncoil them, and manually turn them.  I thought I could use some of your advice. Actually, I dont mind if the process takes time, I am just looking a convenient way. Thanks  Richard

Question by richardphat    |  last reply



Difference Between Type L vs Type ACR Copper Coil

Hello everyone,    I was hoping someone can share advice, tips etc. I plan on getting 55gal steel drum & turning into wood burning pool heater. My question is about which type copper coil would work best, and still be safe to use. My son has Down syndrome and is very sensitive to cold water. We just spent around $1500 to get pool ready with a installed ramp for his wheelchair. We called few different pool people about a reg heater they want from $2500 to $3700. Mostly cause it would not be easy install lot of things in way, etc etc. oh and then add monthly bill. I don't mind the pool temp but my son does and he truly doesn't ask for anything. And if I could safely get pool warm enough for him then I want to at least try. so we really don't have the extra cash to go "normal" pool heater way but I've watched allot of vids on YouTube where they took a steel 55 gal drum, turned on its side and put the copper coil mounted inside at the top. These people would be able to increase temp by allot. Its labor involved but I'm home anyhow taking care of my son. I'm looking at using about 100ft. I can get 1/2 100ft of Type L $163.00 and Type ACR for $119.00. Anyhow Type ACR is much much cheaper then Type L.  Is there a real big difference? Big enough to spend the extra cash and use Type L, instead. Or Is ACR still safe to use with the pool? I'm not sure which Type L or ACR but I've read it say it's cleaned inside the pipe. Does this matter cleaned vs not cleaned inside pipe for what I would be using for? here link of place I'm getting https://m.grainger.com/mobile/product/MUELLER-INDUSTRIES-100-ft-Soft-Coil-Copper-Tubing-4WTC2?breadcrumbCatId=7726&fc;=MWP2IDP2PCP Please any info would be greatly appreciated. Truly thanks so much for your time. Thank Lisa

Topic by fst2011    |  last reply


Best magnet size to coil size ratio for an electromagnetic generator?

What is the best magnet (neodymium - disk shape) size to copper coil size ratio for optimal electron production per one break/pass of flux lines across coil at a 1/2" distance? For instance, if magnet is 2" diameter what is best inner diameter for copper coil? Best number of windings? Best gauge wire? what are the best specs for optimal electron production before you reach "over kill". I know some things are variable like core material and magnet grade. I'm looking for an all things being equal kind of scenario. Also what would be the best thickness of magnet at 2" diameter? If anyone could point me in the direction of any existing tables or ratio information on this subject it would be appreciated. Thank you.

Question by BishopKnight    |  last reply


what type of current flows in the starship coil and in which amount ?

I want to know that what kind of current is flowing in starship coil because it has winding of naked copper wire so if we give any supply than how it will work?

Question by vipsi    |  last reply


need info regarding replacement items in circuit.....

Hi guysI am trying to build a three stage fm transmitter and for the life of me I cannot find a 5-20p trimmer cap anywhere as well as the copper tinned coils...what can I replace the trim cap with.....a cap with a different value? and what can I replace the copper tinned coils with....normal 18 gauge wire coil?..any help will be welcomed

Question by JJK6    |  last reply


need help with a COIL GUN

    I was looking for someone to help me build my first coil gun. Everything seems to be working fine except it seems as if the coil is'nt getting any juice. The battery pack works fine, as do the capacitors. I can charge and discharge them without any problem.      I wanted to just get it working first before adding alot of power so it's a liitle on the mild side of the common 4-capacitor, 4-battery, 1/2 in. thick coil.  Here is a basic outline of what it's packing. 2 330v Capacitors 2 AA Batteries Kodac PowerFlash Circut The coil is 2/3 of an in. long with three layers making it about 1/4 inch thick. Uses a pen shaft as a barrel. Fires a 1/2 in. long steel screw.     The coil is made out of 24 gauge copper wire. The stuff we all used in middle school science were you had to scrape the ends off with sand paper or a knife. So I know it's insullated but all the help sites underline the use of "magnet wire".  Although my friend with more electronic knowlege assures me there the same thing. Oh, and i've insulated each layer with electric tape.     The way I have the circut set up I have 1 wire coming from the positive lead of the capacitor ON the actual circut to the negative lead of the extra capacitor. Then I have a wire leading from the positive end of the extra capacitor to the first end of the coil. To fire, just connect the other end of the coil to the remaining lead on the first capacitor.     I can only think of a few reasons why it would'nt work from just not enough capacitors to too small a coil, or just perhaps how I have it set up. I've also experimented with the position of the projectile but to no avail. It won't even budge.  I've included a rough drawing of the circut in this post. Help me instructables forum! You're my only hope.

Topic by darthDIY    |  last reply


Any suggestions on how to make a bike generator?

I plan on making a 3 phase ac power generator on a bike my attaching magnets to the spokes and having them run by copper coils then convert this to dc current which will power a usb port on the bike, I realize I need diodes and a capacitor if I ever hope this to work but does anyone have suggestions for me? or how to calculate voltage output so I can determine the size and number of coils/magnets I will need? or how to get a steady voltage and ensure devices connected to the usb port won't be fried?

Question by slayer04    |  last reply


Why isn't my medium spark gap Tesla coil working? Answered

I am building a medium Tesla coil. I have checked all the parts of it and I cant find out why it isn't working.  The hv transformer is a 12kv neon sign transformer. There is a gfci but it isn't tripping. For a spark gap, I'm using a single spark gap made of copper. I have tried putting them at various lengths away, but they still don't fire. The capacitors have a total capacitance of 14.1nF and are rated at 15kv. They are ceramic capacitors and current is flowing through them. The primary coil is 0.25 in copper tubing held with 0.25 inches between the windings, of which there are 7.5. I have tried using 1-7.5 turns, and that didn't make a difference. My secondary coil consists of 2032 turns of 32 awg wire around a 4 in inner diameter pvc pipe. I can verify that the 12kv is going through all of the places it is supposed to go through. I have no idea why this isn't working, could anyone help me here?

Question by MohitB34    |  last reply


What is a wire with high resistance that can be found around a household that can be easily heated using 9-72 volts?

Science project. I am trying to use a coil of wire to blow heat off the wire into a room that is roughly 26cm by 16cmSo far have used thin copper wire with a 9 volt battery. No success(heat) D=

Question    |  last reply


How can I make a cheap degaussing coil for a tv (220v). ?

How can I make a cheap degaussing coil for a tv (220v). I've tried a soldering gun and other small transformers but didnt work (big crt tv). I even build a coil with 10 meters of 10AWG (2.5mm) wire in a 12' diameter on 220v which only generated a shortcut (I build this just guessing the amount of wire and awg, so no mystery why I failed). I've read that a coil made out of #24 awg wire and over 1000 loops would do the trick (for 220v and over 500 loops if a used a 220V-110V transformer), but that is too much $ in copper wire. Maybe I could refurbish wire from a old electronic appliance, but not sure which might be it. Any suggestions? Thanks for your time

Question by inserbot    |  last reply


Will this electric generator idea work?

Will this work? A wheel that has neodymium magnets and coil of wire around iron, basically an electromagnetic. next to the wheel is a coil of wire that generates elctricity when the wheel turns, this coil conveys the electricity to the electromagnet through means of copper brushes. On the other side of the wheel is a coil of wire which gets electricity to power things. In my head, id say that the magnet powers the 1st coil then the 1st coil powers the electromagnet which also powers the 1st coil which powers the electromagnet even more. So in my theory, the electromagnetic gets infinitely powerful (till it burns out). So in a way the wheel can be cranked by hand and yet the 2nd coil will get a large amount of energy. Will this work in real life? why or why not? If this idea already exists what is the name?

Topic by alester333    |  last reply


I need help in understanding faradays law? Answered

So this is where i was trying to understand his law, http://www.6pie.com/faradayslaw.php, the part that i got stuck was on where it says, "Lets figure 5 turns per second, that gives us 300 RPM. If we do a good blade design we might be able to get 300 RPM in 3 to 5 mile winds. 5 turns per second gives us one turn every .2 seconds seconds = .2" I am trying to apply this to a bike and want to know how to get past this step to getting Δt of the formula.

Question by diabloboy    |  last reply


i want to make low rpm less torque 1kw generator or alternator?

Can someone please tell me that how to make 1kw low rpm generator or alternator , please tell me the specs of  generator or alternator which is easy to build and takes low rpm for power generation actually i want to make a generator or alternator which needs less torque and rpm , so please tell me the specs for making low rpm less torque generator or alternator specs like how much magnets do i need shape , quantity , grade of a magnet , rpm of a magnet , torque  , gauge of a copper wire , turns of a copper wire , quantity of copper coils , distance between copper coil and magnets etc ( i want rpm of a 1kw generator or alternator  to be 80 -100 rpm )

Question by MuhammadK19    |  last reply


Coils for vertical axis wind generator (VAWT)

I've followed several instructables concerning vertical wind generators but found it hard to locate magnets of any decent size here in the UK. I'm going to have to order some that are about the size of a 2 penny piece (the cost of anything bigger is much more than I can pay for)and therefore I will have to make similarly small coils to equal the magnets size. Considering the base of the generator is 40cm in diam how much space must there be between each coil and can you have more than one row of coils. Another one inside the first. The same configuration with the magnets ofcoarse. Lastly, on these cicular magnets is there a plus and minus to give you an idea of what way round you should attatch the magnets to the bottom side of the rota. Thanks.

Topic by mr thrifty  


Simple electrical insulation question. Answered

If I have a 10AWG insulated solid copper wire and the THHN insulation is rated for 600V, should I worry about a 5000V 60ma current arcing straight through the insulation if its coiled in a helical form?

Question by imMrDude    |  last reply


Looking for directions for a device made in electric shop class that would let the user shock himself.

I remember that it was mounted on a block of wood, and had a metal plate attached to one side with holes in it.  It used a D battery and a copper wire coil.  A rectangular piece of copper with a copper probe attached was held by the user.  You would try to pass the probe through the holes in the metal plate; if you touched the plate, you were shocked. Does anyone have directions for something like this?

Question by sjardim    |  last reply


Tesla coil anyone with new design ideas?

I am in the early stages of building a new Tesla coil. After over 10 years without one I think it is time to add one to my collection again ;) As always I want to stick to to the classic design, meaning except for the HV supply all will be home made, including the capacitor. No no fancy electronics, just high voltage, a cap and a spark gap... However, classic must not always mean there is no room for improvement. Of course you can measure or calculate the frequencies for your primary and secondary coil before even starting to power it up - but where is the fun in that?? My last Tesla coil was driven by a 2KW transformer delivering 25.000 Volts. This time I go smaller for indoor use and will aim for a simple neon sign transformer with around 3000 volts and 20-30mA output. Reason for this that I plan to make an Instructable out of it if I find the time and would prefer to use power supplies that can be obtained in most countries without totally blowing the budget. I did some research on the net to see if there are any significant developments but the only things I could find are in relation to the spark gap or to use a conical primary coil. For the conical coil I could not even find any comparison to standard flat coil in the same system or a decent explanation why it is claimed to be so much better. My aim is to go a different way for the primary completely. Instead of using copper pipe in a standard winding pattern I want to try a quadfilar coil instead. My early tests on a small scale confirmed that a bifilar coil is better than a standard coil. For some weird reson the magnetic field reaches further and is stronger while at the same time there is less loss. So far bilifar coils are only used on some charging pads and "wireless power supplies" for TV sets. In most induction cooktops, where the benefits would be extra obvious, they are not used due to the higher cost factor of producing them. Big question here is: Has anyone experimented with bifilar or quadfilar coils in high voltage applications and is willing share some insight?

Question by Downunder35m  


Homebuilt AC

Hello again everybody, bwpatton1 here with another one of his strange Ideas..... not as dangerous this time. Well, we built a gameroom, and currently it has a 10000 BTU window unit, in the South Texas summer it has a hard time keeping up, it also uses 900watts, well 900watts by itself isnt bad but we have two of these b/c we have two floors. I was wondering if i could build an AC to help supplement the run times of these AC's. My idea was to get an old refrigerator (and keep it outside) and run copper tubing through the freezer and into the refrigerator area and out of the refrigerator. Then, run this copper tube to a copper coil with a blower fan. Sound good sofar? Then I would run the end of the tubing back to the top of the freezer, somewhere in there there would be an inline pump somewhere............ OH and the lines would be filled with water/antifreeze??? Does anybody think this would be efficient enough to build? Or am I just wasting my/your time Diagram- the thing to the left is the refrigerator, and the squiggles are copper coils, and the thing to the right is a blower/coil. You were supposed to be able to read the writing on the diagram but the camera wouldnt cooperate

Topic by bwpatton1    |  last reply


Homebuilt AC unit???

Hello again everybody, bwpatton1 here with another one of his strange Ideas..... not as dangerous this time. Well, we built a gameroom, and currently it has a 10000 BTU window unit, in the South Texas summer it has a hard time keeping up, it also uses 900watts, well 900watts by itself isnt bad but we have two of these b/c we have two floors. I was wondering if i could build an AC to help supplement the run times of these AC's. My idea was to get an old refrigerator (and keep it outside) and run copper tubing through the freezer and into the refrigerator area and out of the refrigerator. Then, run this copper tube to a copper coil with a blower fan. Sound good sofar? Then I would run the end of the tubing back to the top of the freezer, somewhere in there there would be an inline pump somewhere............ OH and the lines would be filled with water/antifreeze??? Does anybody think this would be efficient enough to build? Or am I just wasting my/your time Diagram- the thing to the left is the refrigerator, and the squiggles are copper coils, and the thing to the right is a blower/coil. You were supposed to be able to read the writing on the diagram but the camera wouldnt cooperate

Topic by bwpatton1    |  last reply


wood burning heater idea and questions.

Hey guys, I hear alot about not using copper pipe in chloronated water and rather to use 316 stainless steel, it's just the price difference between copper and that grade steel is vast... so is there anyone that tried copper in chloronated water? And is their any other alternative tubing to copper and steel. Another design i was thinking about was maybe using a barrol, fill the barrel with water, heat the barrol to get water to near boiling, have coiled polypipe in the barrol where the pool water will run through, what you guys think?

Question by tocatech    |  last reply


what is the inductance of a coil which is 3mm in diam having 5 turns? Answered

I'm testing FM transmitter using multisim software.I don't know the value of the inductor to be used in the oscillator ( the oscill. has a variable cap.).I got this ckt. from a site, it is mentioned that the coil should be about 3mm in diameter and 5 turns. The wire is tinned copper wire, 0.61 mm in diameter.Since I'm testing it using multisim so i need a specific value.anyone knows it PLZ... let me know........THANKS.....

Question by manpreet singh    |  last reply


Can you make a brushless motor with "axial" cores and magnets, rather than radial?

In the picture, the black discs are magnets, the copper cylinders are coils, and the acrylic disc spins on the central shaft. 

Question by DrNerdington    |  last reply


With an electromagnet, if there's a open reed switch betwen 1 end of the coil's wire & powersource, will e-mag get hot?

I'm building an electromagnet. The core is soft iron: 0.5" diameter and 1" long.  AWG 12 wire OR enameled copper magnet wire 32 gauge So the wire is wrapped around the core. One wire end leads to a reed switch which connects to one of the two wires of the 9 volt snap-on battery clip. The other wire end connects straight to the 9 volt snap-on battery clip with nothing in between. Will the wire end that connects directly to the 9 volt snap-on battery clip: A.) use powers and drain the battery B.) heat up the electromagnet (wire & core) If the electromagnet heats up, then how hot does it get? Just warm or really warm? Could it reach hot or HOT levels - hot enough to burn skin, damage any part of the electromagnet, or ignite/melt the carpet (if it was on it)?   P.S.  The final device would have no exposed wires. Thanks.

Question by gatorgirl7563    |  last reply


Laptop water cooler? Answered

Hello I have a laptop that gets hot while gaming and i don't have the money for a desktop right now. Basically my idea is to lay down 4 fans then i lay down a mesh sheet then a coil of copper pipe then a another mesh sheet then my laptop  The coils would go to a tub of slightly chilled water and be pumped though How well would this work, Is it possible? Portability is not an issue as i would have this mounted to a piece of wood by my desk Thanks, Kaden

Question by FarmerKJS    |  last reply


How to charge two AA with hydroelectric generator? Answered

For my Sophomore engineering class project I am making a hydroelectric generator that will need to charge two AA or smaller if not enough voltage is possible. The plan is to have my magnets spinning over the wrapped copper coils, but here's where I am stuck. I will have my two leads of the copper wire that are sanded down, but how do I go about charging the AAs form the wires? Do I have the positive copper wire go through some sort of diode then a container for the AAs that go back to the negative copper wire? Thanks in advance for the help. My engineering teacher is frustrating and says that I can go straight into the batteries which I know can't work.

Question by Charles Sparkley    |  last reply


Recover heat from freezer condenser?

Anybody ever tried to use a freezer or fridge condenser to preheat water (before sending it to water heater)? I'm thinking about an easy setup; a coil of copper tubing fastened to the condenser. I know It seems insignificant, but given the low cost of the setup, i think it could be worth it.

Question by jemor143    |  last reply


How to cool my little workshop? Will this work

I have my workshop building i am trying to cool without spending a 1000.00 bucks. I havea small chest freezer forget the cubic feet but it is around 2 ft. by 3ft. in size. I was wondering if i fill 75 5 full of water and instal a coil of 100 feet of 3/8 copper tubing in a coil on the inside running to a 36 inch fan with 75 ft of 3/8 coil on the front and set it to pump 32 degree water to the fan . Do you think this woudl bring a 10ft by 16 ft building down from 100 to 80 degrees ? This would probably be cheaper on electricity over all than a a/c if i could afford one. Can anyone share there thoughts? Thanks alot Andy

Question by andy1917    |  last reply


A powerful EMP generator, to disable (temporarily) stereos in my neighbors house.

Hey guys, I'm trying to build a portable EMP generator, which will be powerful enough to knock out (temporarily) my neighbors stereo (if he plays it on loud at midnight again). My setup is as follows: 8 330v 160uF Capacitors wired up in series. 8 330v charging circuits for the capacitors with their outputs in series wired to the capacitors through a switch. The 8 capacitors are wired up to a coil through a switch. The coil is made from 6 gauge wire (or a 1/16" copper strip) that is coiled 5 times. I would really appreciate any feedback because this is a fairly large undertaking for me, and i'm kind of nervous at working with over 2000v of electricity. Does anyone know if you can discharge a cpapcitor by throwing it into a swimming pool???

Topic by recon506    |  last reply