Introduction: Radio Jammer

Picture of Radio Jammer

This Item is a Radio Jammer. It sends out EM waves of a certain frequency.

Before you enter:
This item is illegal in certain locations. It is only demonstrating how these items work and what only a few dollars at a electronic store can build.

This also Not a Cell phone jammer. Jamming a Cell phone is similar on its principle, but totally a different build, you need a range from 800MHz to 900MHz. You need an OP amp and a few other parts and formulas

F = 1/(4*R1*C)*(R2/R3)
R3/R2 (noticed it flipped) is the frequency range

850MHz = 1/(4*R1*C)*(1/50MHzS)

You must know the fact that they are illegal in certain areas and MUST NOT rant about it and say they are illegal.

Step 1: Precausion

Picture of Precausion

This Item May Be Illegal In You Area, Check It Out Before You Build.
I am not Liable for any offenses.

Why This Works:
The Radio Jammer sends out a EM wave at a frequency. The wave is then broadcast throughout an area. Radios will receive this wave (when tuned to that frequency) and It will block the other wave that is broadcast from a station.

So far in my building, I have only been able to block 1 station using one OSCILLATOR.

Have tried adding 1.5v onto a 9v battery. This unexplainably let me listen to another channel on the channel I was blocking.

Step 2: What You Need

Picture of What You Need

What You Need:

An Oscillator, The heart of the Radio Jammer. The frequency you choose will be the frequency you jam. FM radio is in MegaHertz. Example, If you want to block 100.0, then use a 100Mh Oscillator. It may be a bit confusing. I have a 97.7 MHz that says 97M70000 and a 50 MHz that says 50.0000 MHz.

A 9 volt battery

A L.E.D.

An Antenna


An On/Off Switch

A Circuit Board (Optional, but recommended)

Soldering (Used with the Circuit Board)

Price list:
Oscillator: $2.50
9 Volt Battery: found it somewhere, but i think there maybe $1.00
L.E.D.: $0.10
Antenna: $1.00
Wiring: found in workshop, i got a lot for $1.00
On/Off Switch: $1.50
Circuit Board: $0.50
Soldering: $1.00

Total: $8.60

Step 3: Assembling!

Picture of Assembling!

If the Writing is confusing, Look at the picture

First, get your Oscillator

On it you will see 4 leads

The locations of the leads in () will tell you the location looking at it RIGHT SIDE UP, meaning that the righting will be right-side up, and the lead with the black dot will be the bottom left, and the square corner instead of the rounded corner will also be bottom left.

1 lead (bottom left), the one with a black dot on it, and it also has a square edge instead of a rounded one is Only to hold it on the circuit board and does not need anything attached to it (It shouldn't be attached to anything anyways).

the lead diagonally across from it (Top Right) is to be connected to the antenna.

The two remaining leads are for the voltage source.
The Top Left lead is connected to the +ive end of the battery. The Bottom Right lead is connected to the -ive end of the battery.

Look At the picture

Step 4: Now That Your Done!

Picture of Now That Your Done!

Now that your done the wiring.
You can solider it to a circuit board (optional)

Turning On the jammer will send out an EM wave of X (X is the frequency of the Oscillator)

Tun on the oscillator and... Nothing
You have successfully jammed a radio signal!

Step 5: Extra

Picture of Extra

This is my finished version
It looks really nice

Cutting the plastic was really hard and could have been done a lot easier and safer with A Laser Cutter :). I got a cut when I was carving out the hole for the on/off switch.
Also, cutting thick parts of out of the phone frame would have been a lot easier with A Laser Cutter.

I burnt myself with the soldering iron :( (unfortunately A Laser Cutter wouldn't have stopped it, but...

I also tried opening an Oscillator with some pliers but unfortunately, i broke everything inside and the metal was sharp, maybe I could have done it easier with A Laser Cutter.

Anyways, Thanks for reading my Instructable, and do not rant about how this is Illegal.


Enriquekiwia (author)2017-08-14


RamyP (author)2016-11-10

how to build a mind control jammer

jotclot (author)2016-01-25 I am relatively new to this (I mean computers, software, and the physical properties of sound,) and this question is a little off topic: Let's say, hypothetically, that I am personally hearing human whispers directed at me and these whispers sound exactly like someone I know, hypothetically of course. If I wanted to mask or completely cancel his whispers, which I realize are two entirely different processes, could one of you give me some ideas on how to do so, respectively, and if not maybe provide me with some helpful resources or links? I will attempt to outline my current plan of attack, or should I say defense...Preferably I would rather cancel than mask (keep in mind that some of my thinking /theory may be wrong). First: I would need to record a whisper that fell within the same frequency range (wondering if tone and intonation play a crucial role? Is a whisper considered a flat, non harmonic tone?) of about 5 to 50 Hz. Second: either design a radio jammer or use a DAW, thanks Ecapsretuo, to broadcast this signal over the specified frequency range, but inversely (??? to cancel a sine wave I would need to overlap 3-4 of same recording 180 degrees out of phase to each other in a loop, but how do I determine how long the period should be???). If I used a spectrum tuner could I hone in on exact frequency and adjust accordingly? I would like this system to be portable so I am wondering whether a jammer (i.e. oscillators and/or circuits) or a compressed digital recording in mp3 format would be more practical? After all, both of these could be amplified at a later point to mask the original signal/sound/whisper...correct? Raising another question: Modulation. What type of program would be suitable and over how much area do I need to broadcast the carrier signal? In the case of the jammer, would I accomplish this with an external amplifier or by boosting battery power? If I can't determine exactly what this guy's going to say, how can I mimic the EM wave? Maybe masking is the better solution ??? Someone please help!!!!!!!

Ravenx30 (author)jotclot2016-10-23

Mate you need to block a frequancy between 14.5kHz and 14.8kHz im after the same thing. This will block "silent sound" ;-)

judas79 (author)jotclot2016-10-06

If you are hearing voices while near your computer and its may have a Trojan, like the old sub7, which allowed speech through the onboard speaker, remotely, among other things.

rlogan1 (author)jotclot2016-02-07

If you're hearing voices directed at you without any known source then you should see a doctor. Conditions will get worse the longer they go untreated.

jotclot (author)rlogan12016-02-07

Thanks doc...what I was looking for was a scientific explanation not a cracker-jack diagnosis. Thanks for your invaluable insight.

hydranix (author)jotclot2016-09-22

Hi jotclot, I was wondering if the whispers were still bothering you, or if you perhaps had seen a doctor for their opinion yet?

Don't let the other posters calling you crazy get to you, you're not. Unfortunately though, if you don't see a doctor about it, the whispers could eventually drive you crazy.

I hope all is well with you.

TheCrackerJacker (author)jotclot2016-04-21

I'll have you know that cracker jacks are nutritious and essential for life.

NikcufF (author)jotclot2016-05-24

You need to look into voice to skull-V2K / synthetic telepathy / Electronic Harassment and ORGANIZED STALKING #Gas lighting / Gang stalking /Cointelpro

Micro wave Hearing what you hear is a CRIME BEING PERPETRATED ON YOU! Seriously

jotclot (author)NikcufF2016-06-14

Thank you for the straight up answer : you're the first person to actually listen to me...believe me when I tell you, I'm not crazy and it is very much a crime...once again , thanks. I may message you back if I have any questions for you . Hope that's ok.

Papamidnight (author)jotclot2016-04-19

The physics behind the transmission of sound waves and the transmission of EM waves are quite different. With that said, the theory behind your idea of pi shifting a sound wave into destructive interference is solid. Noise cancelling headphones use this principle. I suspect any device you could build would share more in common with noise cancelling headphones than the jammer above. One of the greatest difficulties will be that the human voice is an incredibly intricate wave. You would need sophisticated recording equipment to achieve a strong effect.

I have to agree with rlogan, if you are hearing whispers from an unkown source, that is a sure sign of a health condition. You should seek medical advice.

FelisC (author)2016-07-16

To jam all stations, just use a small, high-voltage transformer connected directly to a copper coil. Works like a charm.

jandmf (author)2014-02-02

Will this device work on CB base stations ? If so, what is the range in miles of radios that will be affected ?

NikcufF (author)jandmf2016-05-24

No I think UHF jammer needed?

gedion.wolde.9 (author)2015-05-05

please,i need FM radio jammer final project on receiver.thanx for your help

NikcufF (author)gedion.wolde.92016-05-24

there is a you tube video some where just enter it and the guy gives a link to were he got the plans?

vvp (author)2015-09-18

hey send
me the oscillator name plz

samaddon (author)vvp2015-09-20

An oscillator just has a frequency , it's name isn't important , you just need the frequency. LIKE 1M2 means 1.2 Mhz oscillator. And btw thanks for subscribing.

NikcufF (author)samaddon2016-05-24

can you hook different oscillator's or multi units to create a wide sweeping rf jammer?

TonyR82 (author)2016-04-15

Can i jam a radio signal from an invisible electronic dog fence?

CynthiaS47 (author)2016-02-28


Try this and I hope the message reaches you...

Sethian (author)2015-02-16

my body seems to be transmitting an AM signal, look on facebook for Sethian for images of my oscilloscope reading. looking for more knowledge without going back to college. would love some insights

vatrat (author)Sethian2015-08-27

This is most likely a frequency that is in the open air that is being transmitted through you. A common source of powerful background noise is the noise from AC wiring systems. For example, in the US, it's 120v at 60Hz. So, the wires and other things connected to mains act as transmitters, and your body acts as an antenna. Look at the question of why small LEDs will light up dimly when held.

Reginaldlaws (author)Sethian2015-05-24

Did you ever find your answer I think I have a frequency on me as well

ashah53 (author)2015-07-19

can you please send me the circuit diagram of it?

FrankOtheMountain (author)2011-06-10

What frequency osc would I need to jam 660 AM?
WFAN sports radio. Co-workers blasts it all day!!

You would need a 660 megahertz oscillator

gaieb (author)garrettg2015-05-27

No a 660 kilahertz oscillator

Reginaldlaws (author)2015-05-24

I need help finding out how I can trace a frequency and block it

joshuasprings (author)2014-12-12

will this work on a am frequency ??

eddiebee83 (author)2014-04-05

What about Their oscillators seem to range different frequencies, not just one frequency (per oscillator).

Tijil (author)2014-02-13

can only one frequency be jammed(blocked) at a time using a single oscillator?

eddiebee83 (author)2014-01-20

Nice thread Barri. I have many questions as Im sure you get.

Could you use the original battery for the phone so you can just charge it over and over as well as the original antenna? (Im thinkin of going with a 125 oscillator.

Also what about spectrum tuners so you can change the frequency? Transko has them.

What type of wiring and why a circuit board, for the on off switch?

Sorry but I'm a complete noob here.

Parth459 (author)2013-10-20


Parth459 (author)2013-10-20


jeterkurtis (author)2013-09-29

this would be great for a old walkie talkie of mine my mom doesnt ever get off her damn phone now i can make her... at least for a while.

TheIguana57 (author)2011-11-24

If I swapped the oscillator with say a 2.4GHz one, i could jam any wireless router or bluetooth headset operating on that frequency right?

MCtrlSys (author)TheIguana572012-08-26

That depends on power, frequency, harmonics and carrier. There are a number of factors. Overall if you are pumping enough power into the air on the same frequency or on a harmonic of the same frequency it is likely you could jam the channel. Also for all of you who asked, remember that an oscillator is simply a inductor and capacitor in its more basic form. What I would do is take a look at the construction of basic oscillators, stepper generators and radio jamming during times of war. For all intents most radio jamming is simply producing a signal on the same frequency that you want to jam at a higher power with more noise. AKA if you are trying to block a voice signal a good way to do it would be to copy several voices on a tape and send that as a signal.

jongscx (author)MCtrlSys2013-06-15

Or just a really loud version of Never Gonna give you up by Rick Astley.

steveastrouk (author)2013-04-16

You might like to see this link, before you think about building jamming circuits.

srgntpwny (author)2013-03-20

if i put a 2.4 GHz oscillator in this would it block a 3g connection i would be in a situation where im using 4 AAA batteries

markee2 (author)2011-09-15

Nice instructables but oscillator is kinda hard to find. I got circuit here claims that can do the same... radio jammer, dont know what is the idea behind in this circuit. Anyone have idea if it is working or it will be working. circuit copied from:

techxpert (author)markee22012-09-21

Oscillators aren't to hard to find but if you don't own one, like me this is an excellent circuit!!!!!!!!

WakeUpWolfgang (author)markee22012-01-12

I live in a place where it is illegal to use such things. The schematic look really strait forward and simple. I dont know if it would work but I am working on a Faraday cage so I can test such things legally

Da-Nargh (author)2011-06-09

Mr Barri-Kid, I thank you for teaching me how to eviscerate unwanted radio stations at work

mattjoy (author)Da-Nargh2011-09-11

Hello Da-Nargh,

I cannot locate any Oscillators as described here, can you point me in the right direction?

Your help or anyone's would be greatly appreciated.'

I need Mhz around the 107.6

barri_kid (author)mattjoy2011-09-12

I got mine at an electronic surplus store. radio shack may work. I don't know where you are though

mattjoy (author)barri_kid2011-09-12

Hi Barri_kid,

Sorry for my limited info, i am in Australia. The main electronic stores do not supply oscillators of this type. 4 pin... and none of the frequencies I need in my country.

or at least I cannot find them.. perhaps you can point me to an on-line store that supplies oscillators?

barri_kid (author)mattjoy2011-09-12

This may be useful

Usually I don't buy online, so I don't know if its good. I think I have heard of Newarc, or it may have been Newegg.

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