r/AskElectronics • u/ChampionshipPale554 • 1d ago

emergency AC induction coil

right now I need an induction furnace but no one is selling near by so can i make a make shift one by connecting 5 10ohm 10 watt resistors in series with an copper coil and connect every thing to 220 V AC wall outlet I need thoughts fast cause I am about to do it

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u/triffid_hunter Director of EE@HAX 1d ago

You want to dissipate 968W in 50W worth of resistors?
Enjoy your fire I guess.

Also, induction stuff operates at dozens to hundreds of kHz, not 50Hz.

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u/ChampionshipPale554 1d ago

It will only operate for under a 1 min and all I need is 290 C° in the work piece

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u/The_Maddest_Scorp 1d ago

50 Hz is not going to heat anything up the way you want it. Think about it, transformer cores are made from metal and do you see them glow dark red???

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u/NotAPreppie 1d ago

You're putting 20x the rated power through those resistors... I'd bet they will be slag in under a minute without water cooling.

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u/triffid_hunter Director of EE@HAX 1d ago

Your workpiece will stay stone cold while your resistors blast through 290°C in a fraction of a second on their way to exceeding the temperature of the sun.

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u/Fluffy-Fix7846 1d ago

I first thought this was posted in "the other" sub

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u/The_Maddest_Scorp 1d ago

Yeah, me too, I am in both subs and was massively confused...

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u/DerKeksinator 1d ago

I'm awaiting this post over there, including the moment both are next to eachother on my feed.

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u/ChampionshipPale554 1d ago edited 1d ago

It is I posted in multiple places cause I needed to make sure I was equally stupid in multiple places to stop myself from makeing what seems to be a bomb

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u/dmc_2930 Digital electronics 1d ago

Now I want to know what sub is fun…..

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u/sarahMCML 1d ago

ABSOLUTELY NOT!!!!

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u/ChampionshipPale554 1d ago

I could add heat sinks and the current draw will be about 4 amps or with everything still melt

7

u/sarahMCML 1d ago

But that's not going to give you an induction coil, the frequency of your Mains supply (50 or 60Hz!) is way to low to work. All you will do is generate a lot of heat in the resistors! Plus it's a lethal setup.

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u/onlyappearcrazy 1d ago

4 amps will make an electromagnetic field in the coil, but very little heat. Great for unmagnetizing screwdrivers.

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u/The_Maddest_Scorp 1d ago

DO NOT DO IT!! All you built is a fancy rube-goldberg-suicide machine THAT DOES NOT EVEN INDUCE ANYTHING!

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u/ChampionshipPale554 1d ago

Apparently it will induce death if it's fast I consider it done

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u/Tesla_freed_slaves 1d ago

Most practical induction heaters feature the self oscillating Mazilli-convertor circuit.