Instructables
Picture of make a microwave gun (HERF gun)
There are no instructables on making a HERF gun... until now. I saw one on YouTube and thought to my self "I have to have one" so I made one and here I will show you how. 

-= DANGER: this instructable deals with high voltage and microwave radiation, don't attempt unless you know what you are doing, I take no responsibility=-  

-=just to clear this up, microwaves alone wont give you cancer but it can aid in it=-
 
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Step 1: Health and safety

Picture of Health and safety
micronuke.jpg
Microwaves do not have enough energy to chemically change substances by ionization because they are below the level of non-ionizing radiation. The word "radiation"only means that energy can radiate. It dose not mean radioactive in this case but it can. It has not been shown conclusively that microwaves have enough adverse biological effects at low levels. Some but not all studies suggest that long-term exposure may have a carcinogenic effect. This is separate from the risks associated with very high intensity exposure, which can cause heating and burns like any heat source, and not a unique property of microwaves specifically.During World War II, it was observed that individuals in the radiation path of radar installations experienced clicks and buzzing sounds in response to microwave radiation. This microwave auditory effect was thought to be caused by the microwaves inducing an electric current in the hearing centers of the brain. Research by NASA in the 1970s has shown this to be caused by thermal expansion in parts of the inner ear. When injury from exposure to microwaves occurs, it usually results from dielectric heating induced in the body. Exposure to microwave radiation can produce cataracts by this mechanism, because the microwave heating denatures proteins in the crystalline lens of the eye faster than the lens can be cooled by surrounding structures. The lens and cornea of the eye are especially vulnerable because they contain no blood vessels that can carry away heat. Exposure to heavy doses of microwave radiation (as from an oven that has been tampered with to allow operation even with the door open) can produce heat damage in other tissues as well, up to and including serious burns which may not be immediately evident because of the tendency for microwaves to heat deeper tissues with higher moisture content. NEVER get inside a microwave and close the door, you can't always get out!

The guy holding the neon bulb above the magnetron said this-"The photo above is of a neon filled globe being illuminated by the radiation from a 600 watt microwave magnetron. The magnetron makes a nice hand warmer. The funny fringes in the image are caused by the microwave radiation affecting the digital camera."
Mini FAQ:
1. No, it's not dangerous
2. Because I say it isn't
3. Because I've measured.
4. Because I have the equipment.
5. And the know-how.
6. If you think its dangerous then you're wrong.
7. Go play in the freeway. 
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Kethurston8 months ago

can you use this to jam a radar gun?

SirCheez1 year ago
You should warn people about that capacitor.

Tampering with anything you know nothing about, without astute caution, is what step 7 is for: "7. Go play in the freeway." ...Same ends...

But people have a hard time learning from their mistakes if they're dead so I agree, it would be good to throw some warnings around, maybe some nice caution-yellow images with silhouette people being vaporized or dismembered. You know, something nice.

Awesomeness! what kind of killing power does this device have at long range? Is it possible to shield yourself or an object from this kind of attacking force? Is microwave radiation effective in submarine environments or dense jungle? Thank you for your precautions and details.
iThinkBig1 year ago
umm could you redo this one with a step by step for people who don't know how to read schematics?
Learn electronics and how to read schematics. Regardless of what it says, this Instructable IS dangerous: not the radiation, but many other parts are extremely dangerous if you don't know much about electronics. See this comment on another 'ible: http://www.instructables.com/id/Build-a-Microwave-Transformer-Homemade-Welder/step2/Prepare-the-Transformers/?comments=all#CVPQBOAGU7F3451

If you can't read schematics, that generally means you don't know much (AKA anything) about electronics (and I think that schematics are pretty self-explanatory anyway). Without knowledge and precautions, you could be smoking and dead before you hit the ground.
panostzom1 year ago
can i do it without a HVD at all?
amchiavelli2 years ago
Jimmy Proton...could you put more information about the transformer used in this project , the voltagem of capacitor and the diode, filter etc ...I have a big interest to build this and crash the noises neighboors...thanks for everything!
everything you need is contained in the microwave oven
mykiscool1 year ago
Does the polarity matter for magnetrons?
Jimmy Proton (author)  mykiscool1 year ago
I wouldn't think so
A very intresting web for hobbiest
NV092 years ago
Hey I was just wandering what the exact values for your transformer, diode and Cap are?
granz2 years ago
Cool instructable, but I believe you are off on your wavelength calculation. Magnetrons produce about 2.45 GHz so that gives you:

(3*10^8 m/s) / (2.45 * 10^9 Hz) = 0.1224 m
0.1224 m / 0.0254 m/inch = 4.821 inches

When I built one a while back I was able to light up a CFL at greater than 8 ft away.


GASSYPOOTS2 years ago
why kinda files u burn into those cd's with that :D (jk)
Hey. Really nice intractable. I like this. I have a 700 watt magnetron capacitor transformer ect. To run it. At only 700 watts if a waveguide was applied, would the microwaves radiating be strong enough to have effects on me or other people that would happen to be behind this thing? If this does happen to leak a risky amount how can I stop that and tell where and how powerful the radiation is leaking?
Thanks! Once again like you intractable a lot!
moris_zen2 years ago
Should my hard really heat up so much even if I am 2 meters away ?
It is nice in the winter but it doesn't heat up all my body only a small part .
Can it be made to better heat the entire body?
Thanks! cool instructable!
Jimmy Proton (author)  moris_zen2 years ago
Are you using this thing to heat up your body???
Yep , works nice - I now placed it further away and it heats up all my body evenly .
I checked and 2.5Ghz shouldn't cause cancer (it is none ionizing frequency) and shouldn't cause any damage to the DNA .. I hope wikipedia is correct ..
Jimmy Proton (author)  moris_zen2 years ago
It is true that microwaves cant cause cancer because they are lower than the ionization level required to cause cancer but it can cause blindness, damage cells by over heating and maybe even sterilization... I certainly wouldnt stand in front of the thing just for those few reasons and im sure there are more but i may suggest covering your penis in aluminum foil and were glasses with metal screens that can absorb the microwaves.
I guess I wasn't sarcastic enough .. guys - Only a CRAZY person would get close to these extremal strong microwave radiation!!! - I saw the movie on you tube .
Man - there are 4 different interlock mechanism on the microwave preventing leaks in case of damage to the device .
Although my home phone work on same freq 2.4Ghz - it is only 100mW and not 500W (x5000 times more).
I was just joking - need to clarify this in case some layman actually tries it .
Sorry :-)
Jimmy Proton (author)  moris_zen2 years ago
lol well actually some say they are safe to play with unless youre just completely stupid with it but there are people out there that would microwave themselves just to warm up..lol
i wish i could "like" this comment.

also, i love the line "NEVER get inside a microwave and close the door, you can't always get out".
rela3 years ago
So if you scale this up with sheilded protection you could use it as a excavator to do construction like what they use a breaker or rock drill to do.Break rocks in a more uniform manner with 100% accuracy and a done in like minutes.
deaks rela2 years ago
i think you need something like this to disaggregate rock: http://hackaday.com/2010/10/23/marx-generator-knocks-our-rocks-off/

looks breathtaking...
Jimmy Proton (author)  rela3 years ago
Probably not, it would just heat them up (given that they have moisture in them) and may possibly thermal them but I doubt you could make a vary efficient rock crusher out of this.
mossimo33 years ago
I'm curious as to the orientation of the magnetron's antenna in relation to the waveguide. Does it need to be perpendicular to the waveguide (meaning the RF energy radiates perpendicular to the antenna) or can it be in line with the waveguide (meaning the antenna is near-omnidirectional, so orientation is negligible)? The antenna on the magnetron I have has a cylindrical shape, but then tapers off in a conical shape.
Tobor 2.03 years ago
First off how do you tell what to hook up on the capatictor because i cant figure out because it has 4 hookups.
Jimmy Proton (author)  Tobor 2.03 years ago
Picture?
I can't fully tell what hooks up to what, could you post a schematick showing it all?
Jimmy Proton (author)  Tobor 2.03 years ago
There is a schematic on the next step.
But both of the schematics show the capatictor with only two leads and not the other two.
Jimmy Proton (author)  Tobor 2.03 years ago
I have never seen a microwave cap with four leads and i really dont know what they might be for.
Here let me refrase that, the microwave capacitor has four different little parts coming out that you can hook wires up to on the schematics only two wires are connected and in the picture of yours, three are connected.
Jimmy Proton (author)  Tobor 2.03 years ago
I know what your talking about now, where it shows wires connecting, they connect on the terminals on the capacitor.
Oh, now I think i see what connects to what. the first wire (far left) connects to the magnatron and the diode goes to the ground, the middle wire is from the transformer same as the red wire. If i hadn't lost my magnatron a long time ago I would be building right now, but sense i can't find it i am using the trans. and the cap. for i high voltage rail machine gun. once i find a new microwave oven i'm defenatly building this with one mod so i can have my death ray! muhahahahaha!
So finally, a way to really go after all the mosquitoes in my yard! Besides chasing around with a hand-held version on an extension cord, what about aiming the waveguide straight up, and have a UV tube suspended on a string above that. The tube will light up from the microwave, attracting mosquitoes to the airspace above the waveguide where they get warmed up and fry. Maybe a pane of glass across the waveguide and a weather-proof enclosure for the rest? Probably a lot quiter than a standard bug zapper.
That probably dont work because they microwave quickly loose their power.
What? You mean the electrical circuit fails? Why?
They spread out as soon as they leave the magnetron.
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