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Category: Inside Circuits Views: 442 Rank: 10 The Jammer is a very small circuit and can fit inside a small plastic box with 9V battery inside. It can be very illegal if you attach an external antenna so don't. adjust frequency by turning trimmer.  It is intended only as a practical joke device. Datasheet file1: Click here to download 2N2222.pdf datasheet.
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Articles & Projects
Hi all I wanted to know the theory behind a frequency jammer circuit. How does it jam frequencies I know that it emits certain frequency that cancels.
This circuit confuses the infra-red receiver in a TV. It produces a constant signal that interferes with the signal from a remote control and prevents the TV detecting a channel-change or any other command. This allows you to ...
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Comments
RAptor wrote on Dec 3, 2008
whats that #16wire can some one plz tell me tha diameter of the wire i will be very thank full to that one . send it to my e-mail :abdulhadi92@hotmail.com thanks in AdVaNce
llc wrote on Nov 8, 2007
wats the variable capacitor's value?
Ruri wrote on Dec 14, 2007
I think variable capacitor is supposed to be a 45pf tuning cap.
Leftorium wrote on Feb 9, 2008
I've used 4-20pF. It's work very well with Vhf.
razbinn wrote on Feb 28, 2008
where would you attatch the antenna??????
George wrote on Mar 2, 2008
Very impressive. It doesn't do TV quite as well as I hoped but it takes down my FM radio pretty fast... and i believe with my knowledge of electronics that if one was to install an antenna, the best place would be on the same pin of the transistor as the coil.
leslie wrote on Mar 26, 2008
Nice little gadget, small but does the job. It does work, yes i agree with you George, the antenna position is where you say it works. how about adding a white noise circuit to it, wow even worse, see what happens.
none wrote on Mar 26, 2008
is there any other transistor you could substitute
for the pn2222
br1 wrote on Apr 12, 2008
The pn2222 can be easly found at www.amazing1.com, they also sell the variable capacitor, they use a 6-35pF variable capacitor. They also sell the full kit.
By the way were would you put the white noise circuit?
wrote on Apr 30, 2008
what range of frequencies will this work for? Could i push it to arouns 3Mhz? Thanks
Rich wrote on May 3, 2008
I like cheese
none wrote on Apr 18, 2008
like say could you substitute the pn2222 for 2n4401 or the 2n4403 ????
Dan wrote on May 20, 2008
I couldn't find all the parts I needed so I made some substitutions:
10K + 4.7K instead of a 15K resistor
7pf cap instead of a 6pf
trimmer cap - NO CLUE WHAT VALUE
2n2222 instead of pn2222
However, mine my circuit doesn't seem to be working! I think it's because I have no clue what range my trimmer cap is. Could someone suggest a fixed value capacitor to target a frequency in the FM band?
Thanks!
schutze wrote on May 31, 2008
what variable capacitor do I use to jam fm and tv?
what does #16 wire mean?
apk wrote on Jun 12, 2008
I like this.Is it applicable to loudspeaker jamming?
If anyone ideas about loudspeaker jammer plz help.
could you mail me circuit or idea if u have abt loudspeaker jammer?
Thanx
anonymous wrote on Jun 13, 2008
Hie is it possible to use the same circuit for high frequency jamming?
Jammin' with Bob wrote on Jul 12, 2008
Loudspeaker jammin? Tell me more. how to, where to and how far? I need about 150 meters of reach.
Unknown wrote on Jul 18, 2008
How can we increase the frequency up to 900-1800 MHZ?????
faize wrote on Jul 22, 2008
I think that is incomlete circuit there is input and out put not defined...........
Nick wrote on Jul 22, 2008
Is it possible to use this to jam cb freq 27mhz to say 27.900mhz...Basically i am after a small jammer to hide close to an idiot so he cant hear anything hoping that he gives up CB.....Thanks
Linas wrote on Oct 25, 2009
who can help me,i need 900/1800 Mobile Phone Jammers schematic,thank for help :)
Loudspeaker nuisance wrote on Sep 13, 2008
Hi, more than TV or FM jammer, what we need is a loud speaker jammer. Some stupids play old bring songs often in the streets in the name of functions and the volume is ear deafening. Plz come up with a loud speaker jammer which really works...
trasistor replacment wrote on May 25, 2009
can i used another type of transistor instead of pn2222?
hkBattousai wrote on Aug 11, 2009
Poor schematics.
Some circuit elements are not defined.
There is no specification (Output spectrum & waveform, etc) for the circuit.
giueseppe wrote on Jul 31, 2009
how what is radio tv! I think my cicrcit make work but my light go off? Could maybe used 1N34 for 2pn2222!
440herz wrote on Aug 13, 2009
'loudspeaker jammer' LOL...sure, and after I send you a schematic for loudspeaker jamming I suppose you'll want the circuit that turns taffic lights green as you approach, or the lawnmower jammer that shuts down petrol lawnmowers from up to 50 meteres. Sorry but I am not giving out that information.
sos wrote on Nov 24, 2009
avariable capacitor from 5-45pf and when we want to jamming on TV we must turn
capacitor
USSR wrote on Aug 19, 2009
"This device can be very illegall" - why?
This is tipysh oscillator shematic and it is as illegal as knife on your kitchen!
Same circuit you can find in old FM radios.
endorfun wrote on Aug 22, 2009
I loud speaker jammer? I think the only way you are going to get an rf type jamming device to jam a loud speaker is not likely to happen unless the loud speaker source is a radio broadcast which this device will use anyway. Jamming a wired speaker is not possible with any RF device of any wattage!
Endorfun wrote on Aug 22, 2009
As for the antenae. I silver soldered a 20 gauge copper wire of approx 25 cm to the fourth winding of the coil, and it worked rather well. Any wire really between 12 and 30 cm attached anywhere on the coil will do.
nemo wrote on Sep 26, 2009
Anyone knows what "#16 wire" maens? 1.6mm or 0.16mm or something else?
Johnny English wrote on Nov 24, 2009
why have we used capacitors here?
isn't it used to eliminate the DC input?
as i've used in my FM transmitter circuit?
i have made this circuit at home, don't know the exact frequency at which it operates!
Germanico wrote on Dec 4, 2009
#16 wire means wire that is at 16 in the AWG, the american wire gauge table. Google it up.
It would be around 1.2 mm.
mR.HornY wrote on Nov 10, 2009
This circuit is incommensurable. and i believe have short-range out and simple.
I need a REAL!
Saqib Ahmed wrote on Dec 8, 2009
BC 547 is a good substitution for PN 2222. #16 wire means 16 gague wire. I think it will be SWG i.e, Standard wire system.Instead of 6 pF 4.7 pF performs best. 10 K instead of 15K and 4.7 K instead of 3.9K will give best results. Remaining circuit is quite good to introduce with wave jamming.
zeeshan aslam wrote on Jan 8, 2010
can any one help me by sending me the theory about this circuit i mean the principles and basic concepts about the jammer and also a little description abt the function of components used in the ckt...
my email id is shanikhan01@yahoo.com
plz do rply as soon as possible
signalknight01 wrote on Jan 19, 2010
you can order cell phone jammer online from www.???.com ,if you have any question about cell phone jammer,you can talk with workers online too
Omni_squirrel wrote on Mar 12, 2010
Very simple, constructed it, and successfully jammed two radios in my electronics class! Have yet to try it on "TV" but it definitely works as a radio jammer!
Thanks for the schem!
vk6fssa(swastik) wrote on May 2, 2010
can this be used for other frequency bands if yes how (bit new to electronics myself 13 years old)
salman wrote on Mar 21, 2010
plz tell me what frequency range is best compatible with this circuit?ASAP
surojit wrote on May 18, 2010
whats that #16wire can some one plz tell me tha diameter of the wire i will be very thank full to that one . Thanks.
anyone wrote on Jun 21, 2010
ive got a great idea... instead of jamming one station, why not jam all! romove the 3.9k resistor and replace the 15k with a 10k, i used a 0-180 Vcap. tune to 107.3 and tune it till you hear the most interference without blocking it, then change the station and you will hear nothing but fuss!
whatever wrote on Aug 19, 2010
#16wire is 1mm2 wire
asdf wrote on Aug 14, 2010
Can anyone build one for me? I need to jam all FM. My neighbor is driving my baby crazy with the high volume and I need the baby to sleep.
Thank you very much.
Farhan wrote on Jul 2, 2011
Hey!! I think spark gaps can do the trick causing substantial interference in the loudspeakers. Spark gaps of Tesla coils can produce high Electromagnetic Interference producing a screeching sound like Mobile phone signals do.
Bob in New York City wrote on Dec 21, 2011
Can I get someone to build one of these jammers for me ? I have a pain in the butt downstairs neighbor who has no regard for other people with her music and tv volumes. I will pay to have someone build and ship this to me. C.O.D
Jorgie wrote on Jan 31, 2012
hi, i've to do this as a project in my class. what i want to noe is how did you decide te values of the components??? could u plz send me the design of this circuit ....u could send me the design...... do help me out!!!!!!!
asdf wrote on Apr 1, 2012
I would like to buy FM radio jammer.
Please.
G.D.Shark wrote on May 11, 2012
This is the greatest little jammer ever designed! Just think of how well it will work with an amplifier behind it!
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