How to Build an Induction Heater (500W)

  • Published on May 17, 2018
  • Video of the induction heater melting stuff will be out next!
    This is how to build a powerful water cooled 500W induction heater capable of getting iron and graphite to a bright orange heat and easily melting aluminum in mere minutes.
    List of materials:
    IRFP250N MOSFETs (2)
    UF4007 fast diodes (2)
    14 turn 14AWG yellow PC ATX PSU core inductors/chokes (2)
    1/4W 10K resistors (2)
    5 turn 1/4" copper tubing work coil (1)
    ~490 ohm 2W resistors (two 1Kohm 1W in parallel) (2)
    330nF 440VAC MKP 3381 film capacitors (6)
    1N4742A 12V 1W zener diodes (2)
    50mm diameter 5mm thick semicircle copper slab heat sinks for MOSFETs, soldered to the tubing that connects to the work coil (2)
    Current shunt ammeter (few feet of 6AWG wire; not strictly necessary but important for monitoring current draw) (1)
    12V motorcycle lead acid batteries for power, in series for 24V (2)
    This project turned out to be far more powerful than I had imagined. In my limited experience, the keys to success with these moderately high-powered induction heater projects are:
    - Following someone else's schematics closely for component selection
    - Doing EXTENSIVE research to confirm when deviations from schematics will work and when they won't
    - Using heavy duty cooling (LOTS of water cooling and large pieces of copper) to effectively manage heat
    - Keeping connections short and thick (helps with high frequency and high current)
    - I really can't overstate the importance of doing hours of research. Find designs that are confirmed to work, and try to replicate as exactly as possible what they look like.
    Overall, this project has been an immensely educational experience, both in physical design of high power devices and in electronics theory. 10/10, would recommend :)
    First soundtrack:
    "I Can Feel it Coming" Kevin MacLeod (
    Licensed under Creative Commons: By Attribution 3.0 License
    Second soundtrack:
    "Andreas Theme" Kevin MacLeod (
    Licensed under Creative Commons: By Attribution 3.0 License
  • Science & TechnologyScience & Technology

Comments • 78

  • ali goli
    ali goli 2 days ago +1

    thank you very much my friend. high level structure .very nice & easy for make at home & by beginners



  • Kenneth Wallace
    Kenneth Wallace 24 days ago

    Finally this makes sense

  • Jon Val
    Jon Val Month ago


  • money penni1
    money penni1 Month ago

    AMAZING!!!! Thank you for sharing...:-} Did you just put the sand in the coil to prevent it from crimping or did you leave it in there? What was your water source?

  • cedr777
    cedr777 Month ago +2

    All that and no demo..sad.

  • Trường Quang
    Trường Quang Month ago

    I need a wiring diagram. Can you give me .please

    • The Plutonium Bunny
      The Plutonium Bunny  Month ago

      This site is helpful for that. Good luck!

  • Syed Talha Hasnain
    Syed Talha Hasnain Month ago

    How did you calculate the turns and wire diameter with given inductance.?

    • The Plutonium Bunny
      The Plutonium Bunny  Month ago +1

      I copied from other designs online that used around this many turns and chose my copper tubing diameter to be 1/4" so that it would carry the cooling water. I didn't really aim for a particular inductance.

  • Masud Rana
    Masud Rana 2 months ago


  • Miguel Sierra
    Miguel Sierra 4 months ago


  • jocko Ferguson
    jocko Ferguson 4 months ago

    so as far as following as closely as possible... are all 6 caps in parellel? 1.98uF?1980nF

    • The Plutonium Bunny
      The Plutonium Bunny  4 months ago

      Yep! That is what I used. The exact capacitance isn't critical - you could do with a few more uF or a bit less.

  • Uma S
    Uma S 5 months ago +1

    Can a induction heater circuit be used ? Consider the fact that the coil has same coil but the coil configuration is changed

  • Achban Ilacran
    Achban Ilacran 5 months ago +2


  • Raydio Paleo
    Raydio Paleo 5 months ago +1

    LOL! u made my day. Question, why not put mosfet on arriving cold water tube?

  • Jason Wortham
    Jason Wortham 6 months ago

    thank you,people that teach ,really show something ,thank you.

  • Avin Mathew Varghese
    Avin Mathew Varghese 6 months ago

    My purpose is to heat 5 inch steel pipe to 150 degree.Please suggest
    appropriate induction heater

    • Uma S
      Uma S 5 months ago

      It go KABOOM!!!!

  • Rufusfungus
    Rufusfungus 6 months ago

    lose the crappy music. It's distracting and even more annoying.

    • money penni1
      money penni1 Month ago

      hey fung; lose the crappy attitude & use your volume to turn it off....not too difficult for you to figure out is it?

  • Faishal Fadlan
    Faishal Fadlan 6 months ago

    Im suck dude

  • Maheshpagre Maheshpagare

    सब खिचड़ा कर दिया गधे ने

  • cobracommander936
    cobracommander936 6 months ago

    video sucked balls music was awesome!

  • Browarus Pierogus
    Browarus Pierogus 7 months ago +5

    I'd like to see a power supply that can handle those amps. Those mosfets handle max 20A (specs) or they blow up.

  • 霏
     7 months ago


  • dale nassar
    dale nassar 7 months ago +2

    The caps I have look like yours, but have "X2" printed on them. Do you know what this means? Thanks for the GREAT video!

    • The Plutonium Bunny
      The Plutonium Bunny  7 months ago +1

      The "X" is the class the capacitor belongs to. An "X2" capacitor is intended for application across an AC hot/neutral pair of wires, so if it fails it will result in a short. The "Y" class of capacitors is for line to ground, so failure may result in electric shock. I have used X2 capacitors before and they work well - it's just a safety rating.

  • dale nassar
    dale nassar 7 months ago +4

    I made my Cu strips by banging flat an un-cut piece of tubing. Much easier!

  • Erik Schiegg
    Erik Schiegg 7 months ago

    With sodiumsilicate aka water glass, you could glue a thin sheet of airgel around the crucible. Make some horizontal grooves with sandpaper around the crucible. Keeps the coil cool and heats better. You can make water glass with cat litter and lye. See the available videos. Cost is maybe ten bucks for gallons of water glass.

  • Michael Bishop
    Michael Bishop 7 months ago +2

    That laughter at the end has earned you a subscriber.

  • LordSheoGorath 87
    LordSheoGorath 87 7 months ago +2

    Man that's awesome, how much would you charge to build me one

  • Asep Saepudin
    Asep Saepudin 7 months ago

    In the end of video what is wrong with you lol

  • Kami Star
    Kami Star 7 months ago +1

    The scariest part of your video is here 4:31

  • Bill T
    Bill T 8 months ago

    Eagerly awaiting the demonstration video. Have you attempted to calculate efficiency of power in to heat gained in the metal and crucible? I would like to build one of these for casting like 20 lbs of iron. That's 3.75MJ of energy I need and to be more convenient than oil fired furnace, I'd like to do it in say 30 min, so thats 2,000 watts. I can already cast iron with my vegetable oil fired foundry, but electricity has some enticing advantages. Let me know if you need any general foundry info, as thats all my channel.

    • Bill T
      Bill T 8 months ago

      @The Plutonium Bunny most accurate way would be to put a amperage meter around the lead to your power source, or plug your power source into a wall kill-a-watt type meter and run it.

    • The Plutonium Bunny
      The Plutonium Bunny  8 months ago +1

      I have not yet attempted that calculation. How would you recommend such a measurement?
      Also, impressive goals for your induction heater! Let me know how it goes. Electric is definitely nice for speed, noise, and reduced cleanup.

  • Dr Moriarty
    Dr Moriarty 8 months ago +9

    00:08 Here's a radical idea, Dr Einstein: use a smegging funnel.

    • Ci 21
      Ci 21 6 months ago +1

      idiotboy 5000 Your name says it all son, your name says it all.

    • idiotboy 5000
      idiotboy 5000 6 months ago

      Shut up smartass

    • Ci 21
      Ci 21 7 months ago +4

      Dr Moriarty I had to laugh when i saw only 1/4 of the sand go into the copper pipe and the rest went on the floor.

  • T Suleman W
    T Suleman W 9 months ago +1


  • AliReza A
    AliReza A 9 months ago

    How long did it take to become hot workpiece???

  • AliReza A
    AliReza A 9 months ago

    Thank you so much
    How much your input current???

    • AliReza A
      AliReza A 9 months ago

      Thanks a lot

    • The Plutonium Bunny
      The Plutonium Bunny  9 months ago

      At the absolute maximum power I have achieved, the device drew 20 amps from a 24V source (the two 12V batteries in series).

  • lyvwyr70
    lyvwyr70 9 months ago

    if i wanted 10 turns instead of 5 in the coil, what changes would i have to make to the circuitry

    • Court
      Court 7 months ago

      Keep in mind higher frequencies won't penetrate into the metal as far, and can run into radio/microwave frequencies if you go too high. 10 turns wont put you near to that though.
      What is your motivation for more turns?

    • The Plutonium Bunny
      The Plutonium Bunny  9 months ago

      That would change the resonant frequency of the LC tank (the capacitor-inductor resonator). I am not certain if you would need to change the circuit at all - try it and see how different coils behave in terms of power output!

  • andik hariyanto
    andik hariyanto 10 months ago +2

    wow....thats very cool

  • Kun26 TV
    Kun26 TV 11 months ago +20

    end of video was creepy laughing

  • Cheppy44
    Cheppy44 11 months ago


  • Milton Hernandez
    Milton Hernandez 11 months ago

    Is it possible to make a coil that heats flat surfaces??

    • Milton Hernandez
      Milton Hernandez 11 months ago

      Thank you appreciate the reply will you be demonstrating a pancake coil anytime in the future?

    • The Plutonium Bunny
      The Plutonium Bunny  11 months ago

      Yes! That would be a pancake coil - you can look those online.

  • Robert Silkovsky
    Robert Silkovsky Year ago +5

    Can we make it 1KW by doubling the Mosfets?

    • Energie Z
      Energie Z Month ago

      I have build my own induction heater. I used 3 paralell mosfets and everything worked fine

    • The Plutonium Bunny
      The Plutonium Bunny  Year ago +1

      It has been a while since I have looked at schematics for this, but that sounds like a familiar idea. I would look for people's designs that use such an idea to confirm that it works. Sorry I can't offer a more conclusive answer - electronics classes are in my future but haven't happened yet.

  • kenneth enriquez
    kenneth enriquez Year ago

    What metals have you melted with this setup?

    • The Plutonium Bunny
      The Plutonium Bunny  Year ago +1

      As of now, just aluminum. But anything with a lower melting point would work as well if placed in a graphite crucible. Honestly I haven't had a lot of time to test the limits of the machine; the video of melting stuff may take a while to appear due to summer commitments. It will happen though.

  • Anon
    Anon Year ago

    Why sand?

    • Nikola Nedeljkovic
      Nikola Nedeljkovic 6 months ago

      They usually use soap water instead of sand (tube has to be frozen with the water inside of it)

    • Jon Iszard
      Jon Iszard 7 months ago

      The benefit of sand is that it can be removed after bending to allow for fluid circulation if you plan to cool your coil this way.

    • Baladár
      Baladár 8 months ago

      I guess you know why he used sand... It's free (if you take a bucket to the seashore), and it's much easier to fill or take it out from the tube.

    • dmh2693
      dmh2693 11 months ago

      @The Plutonium Bunny you could also use a fusible alloy as a more expensive option as a filler instead of sand.

    • The Plutonium Bunny
      The Plutonium Bunny  Year ago +3

      The sand prevents the copper tubing from collapsing/kinking on itself when it is bent around the PVC pipe. It works really well for making smooth, tight turns.

  • Nick's Garage
    Nick's Garage Year ago +3

    Yo, what are the pro/con of a arc furnace vs wire heating element for smelting.

    • Court
      Court 7 months ago +1

      I have seen designs for arc furnaces using standard welders and carbon electrodes. It can be done, but keeping it all working consistently would take some practice and probably a feed mechanism. The arc furnaces would be very loud, and consume the electrodes.
      The wire furnaces main issue is that they are not hot enough for foundry work for steel and copper alloys. They work for aluminum. Another issue is that vapors coming off the metal damage the wire reducing its life.
      Induction avoids both of those issues, but is more expensive or difficult to setup. It may also only work well in a narrower range of materials, the frequency requiring a change for other materials. Induction also stirs the metal which can be both good and bad.

    • Jane Christensen
      Jane Christensen 7 months ago +2

      @coochie swipers Induction heaters work with non ferrous metals too. It's all a matter of power and frequency.

    • coochie swipers
      coochie swipers 9 months ago

      Arc furnace heating allows you to heat and/or melt all metals, while induction heating only allows you to heat ferrite metals. If you are only melting metals such as iron or Steele, this is the way to go. If you're melting copper or gold, you won't be able to do that with this.

    • The Plutonium Bunny
      The Plutonium Bunny  Year ago +2

      Generally an arc furnace will be harder to build and will give rapid, somewhat uncontrolled, but extremely powerful hearing. You can, for example, easily melt iron and reach temperatures in excess of 3000C with an arc furnace. A wire heating element furnace will be easier to build and allow for slow or carefully controlled heating, but it will be harder to reach extreme temperatures with wire heating elements. They can easily temperatures of 1400C (Kanthal A1 wire), which is still pretty toasty. So it depends on application.

  • keghn feem
    keghn feem Year ago +2

    About time. I was worried. Thought one of your experiment went bad.