how do you make an EMP?

how can you make a little EMP, only strong enough to disrupt (not destroy) electronics? i would be nice if re-usable, or pocket size.

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solidacid8 years ago
I have made mini EMP's before..

grab a tube of some sort(preferably not metal) wrap copper wire from one end to the other and connects the ends of the wire.
put a firecracker in the middle of the tube(possibly with a fuse sticking out of a small hole) and put a strong neodymium magnet on each side of the firecracker.
light it and run
but be careful pieces of the tube can come flying at you or you could get hit by the magnets flying out of the tube's ends
dbiswas62 years ago

HEY everone....see i know how to make and emp...but the main dumb problem is that i. Am using a 400wv, 1000uf capacitor instead the disposable one and so cant charge that capacitor.....It would be DAMN NICE if someone told me how the heck should i create a CHARGIN CIRCUIT for the 400wv, 1000uf capacitor........THANK YOU FOR YOUR TIME.

necropolian (author) 8 years ago
there are people who made a special device in large numbers around here, around the WK football. it wasn't an EMP, but it shot out every signal capable of shutting a television of. for around 25 €, you can put every television out, and watch the 'probably outrageous' reactions!
That's probably a 'tv-b-gone', which is just a remote control putting out an 'off' signal. There's a couple of instructables on how to make or boost them. An EMP is a very strong radio pulse that induces an electrical charge on any long conductor (like an antenna or power cord). You can see something similar when you run an old blender or vacuum and you get static on the TV or radio. It's a result of the arcing in the brushes. Unless you have access to gigawatts of electricity, you aren't going to get enough power transferred to cause any damage or effect.
necropolian (author)  jtobako8 years ago
ahh, oke.
WHAT! There small battery powered small E.M.P. devices that can scramble things like phones and calculators and other devices that size plus there pocket size.
No, those are interference devices. They broadcast a signal that confuses the signal the phone would usually receive or send out a signal strong enough to overpower the regular one. An EMP creates a pulse of radio waves in a wire (antenna) strong enough to fry electrical components.
I live in gernany. I want to ask if you can Build me an EMP with that i can only destroye a human Chip implantat. Does this go whith the soleoid EMP. I only want to destroye the Chip implantat. Perhaps you can give me a exactly Description for it with normal Things who everyone have at home. Are you a expert. I would Pay you much if you can Build me a human Chip implantat destroyer. But it don t have to bring me to death or damage others Things. Only my Personal Radius. Perhsps s rfid Killer would be bettet in my Case. I think you know it bettet. I would Pay you much for a safty Constitution. Give me please fast an answer it is very emergency. I would be very thanksful for you help
That's a TV be gone i need to get around to building one.
takn373 years ago

what about an emp that can destroy a calculator, r/c car or helic or smthn

I make pocket ones that disrupt and not fry I used it in class on a projector nonstop(i sit next to the cart)and the lesson was cancelled HOW TO MAKE get camera flash thingys and a AA u will need 6 electrolytic capacitors and a button.keep them in a case(i use altoid cases)hook them up and hook a coil on the case exterior. Once the capacitors charge discharge them quickly to send the blast.
could you send me the instructions
can you please send me pics and detailed instructions on how to do it
could you send me some pics too?
Could you send me the full details with a picture
Can you mail me the full details as well?
sir, can you mail me with full details and pic?
Hey im really interested in the emp can u send me pics on how to make it at
I have built a few coils for various purposes, would you have any idea which may be best?
-A short (3/4"), multilayered coil over an old magnet wire spool
-A 4 or 5 inch single layer coil
-A 4 or 5 inch multilayer coil
-A short single layer coil on a magnet wire spool

I wanna get the best metaphorical "bang" for my work :3
From what I understand, it's really "coil density" that does the trick. The multilayer coil that is 4/5 inch is bigger, and it has a higher density, so I think that'll do it. Of course, if you are decent at soldering and you have a bunch of electronics to test it on, then you can do some tests at different ranges with each.
This sounds really great for making small EMPs. Ive got most of the stuff needed, but I would appreciate it if you could elaborate exactly how it all fits together in the altoid case.
yveg4 years ago
I would like to have a very small emp device. I am willing to pay for all the expenses. Please let me know if someone can help.
ok I know this is cheating but if you have not been here yet check out this site it has kits and everything
You can take a disposable camera f;ash, or link several in series, and attach this to an electromagnetic coil. You could probaby use very fine wire to make the coil. Such a device will probably wreck a phone or something at close range. You can also use them to short out rfid tags in passports and such.
This method is even fairly safe! No explosives...
To increase the capacitance you have to connect them in series.
Capacitors in series are added together using this formula:
capacitance formula.png
eremyja eremyja5 years ago
To increase the capacitance you have to connect them in *parallel*.
in series use the above formula
You lost me with the whole camera flash thing. how is that going to send out a pulse?
The electricity from the flash capacitor will go through the coil, creating an electromagnetic pulse. Depending on your coil size the effect probably wont be very powerful or large, but as stated above it could wreck a modern digital device at close range.
could it break a spiderwire?
ok well this sounds like something i wanna do! haha well how smal should the wire be and how big should the coil be... or like what? i have some 30 gauge enamel-covered solid-conductor copper wire wud that work??
wow your Idea is a lot like mine I'm also using disposable camera flash circuits but I'm having troble
the_mad_man8 years ago
large HV (~240V) capacitor bank (bigger the better) and a huge coil, once again, bigger the better (to a point) and air core it if you want range, iron/ferrite core it for short range but more devestatating
so basically an electro magnet type setup, but with all the charge being released at once, an on a larger voltage, as opposed to a steady 9v current for an electromagnet?
simple: nuclear weaponry
necropolian (author)  pie_lover1238 years ago
i said little, nuclear weaponry creates an EMP, but the blast destroys everything anyway.
unless its detonated in the high atmosphere or space, where the blast is useless, but the EM waves continue on, gamma being the shortest wavelength therefor oing farthest... i think xD
1. Get very far away, wrap your iPod and phone in aluminum foil. In a ridiculously short period of time: 2. Connect a very large capacitor bank to a thick copper coil housed in an electrically isolated conductive cylinder. 3. Detonate a high-explosive core (over which the coil fits like a sleeve) at one end. The high current passing through the copper coil creates a strong magnetic field, the moving explosion in the middle of the coil shorts the coil against the housing. This moving short circuit in the coil compresses the aforementioned magnetic field, eventually leading to the much desired electromagnetic pulse. As for finding detailed assembly instructions, I wish you the best of luck. (Info from
You don't have any idea what you're talking about, do you?
Did I miss the part where you gave a more accurate answer?
No, that part never existed, except in my head. A long time ago.
He got it a bit wrong, but he's talking about a HERF gun.
necropolian (author)  Jonny Katana8 years ago
well, i have the opportunity, the chance, the money, the guts, and everything to buy an Ipod an a phone, but i don't have/want them. i've aready searched howstuffworks, but this is still the most useful. thanks.
Flash6358 years ago
You get a magnetron out of a microwave, but I don't remember how to make it directional nor how to stop it microwaving your guts. I know it's possible though.
Xmas50 Flash6356 years ago
Lead cone
necropolian (author)  Flash6358 years ago
well, to stop it from microwaving your 'genitals', just make underpants out of aluminium foil. but indeed, i can use a microwave....
squiggas217 years ago
hey all,
i've been wanting to make an EMP with a friend for a while. i'm somewhat fail at technology, and i was wondering if one of you brains could give me a "How to make an EMP for dummies" sorta thing.

i've done some research and looked at clips on youtube and stuff, but i can't really make heads or tails of it all.

any help at all would be fantasitc,
cheers =)
@ squiggas21 yeah sure i saw ur post, all an electromagnetic pulse (EMP) really IS,is a Dinosuare VCR or cassette eraser hooked up to a cap bank in other words its just a magnet with a amplifyed reversed polarity. The reason it fryes electronics is due to the magnetic field it generates. Just like if you take a credit card and place it next to a speaker, the magnet within the speaker disrupts the magnetic frequency if you will say on the credit cards barcode. This is a rough scematic of what it should look like
\ /_-----------------------+ -
----p------ 000000----(\)----24vlts

p=switch ----=wire 0=capasitors (/) charging switch [____]=eraser -=copper coductive wire within \ /=leads +-=battery I strongly advise u not to play around with this device this is a capital punishment under chapter 14 section 35
"any officer qualified to serve criminal process may arrest without a warrant " =(...( *i have no resposibility for how u use it, educational purposes only* )
dued thanks for the idar it is perfit for my book
ur welcome
Gen. Ammo7 years ago
I'm guessing you can get an mini-transformer like the ones in plugs and put it in lots of Volts so you can use like, I dunno, like four 9V batteries or something and when the current goes up (I'm assuming you know how to modify transformers) the strength increases. You can try to get 4 nails (2x2) where one nail is facing the opposite way of the one above and next to it and wrap up as much copper wire as possible (they have to be insulated) and then fire it up, also to fry it you have to be close to the electrical equipment and move so the target produces electricity due to the electromagnetic field you made cos of the batteries.
If this doesn't work there is a simple thing... that is either:
1) Nuke the city or 2) make a random machine that consumes as much energy and f**k up the neighbourhood and if that doesn't work just 3) Go to the toilet and s**t yourself.
altomic8 years ago
dude this website is full of adult stuff!!!
And Inappropriate things to.
gingerafro8 years ago
please i need to no as i want to destroy my school!!!!!!!!!!
d2j58 years ago
you could launch a nuclear missle abouve the earths atmosphere to cause a total blackout that mmmiiiggghhtt last for a few months. :) but the possibility of that
necropolian (author) 8 years ago
I just want to clear this out: i am perfectly aware of the effect of en EMP, what it is, and why. i don't know much about currency and voltages, and i just want to know if it's possible to make a small one. and thanks for the answers so far.
R1Ch08 years ago
you could try plugging a bank of capacitors to a single loop antennae (what ever that means) try wikipedia