I've had a few scuffles in my house over the TV remote so I decided to do something about it. I built a circuit that will block my TV and any device I choose from getting a signal from the normal remote control. I turn an ordinary remote into a jammer and the remote still works normally! Watch the video to see it work.

## Step 1: What You Need...

I chose to use a Sony remote control (SR-P30) because it has plenty of room inside to add my circuit and a 9 volt battery while keeping the remote fully functional.

The circuit parts:

1. Small circuit board
2. (1) 10k variable resistor
3. (1) 555 Timer
4. (4) resistors. 470ohm, 1k, 560ohm
5. (2) high speed switching diodes 1N4148
6. (1) transistor - BC557
7. (2) Infrared LED's
8. (2) 10nf capacitors
9. (1) 9 volt battery

Build the circuit based on the diagram below.

## Step 2: Install the Circuit...

I hot glued the circuit inside the remote control. I also had to remove 2 posts to make room for the 9 volt battery. Tape down the LED's near the existing LED. I used the existing switch on the remote and wired my 9 volt battery to it.

## Step 3: Test It Out!

You may have to tinker with the 10k pot to get the frequency right for the device you are targeting. Adjust the pot while the remote is 'on' and test it with the original remote until the jammer confuses the device. Now, just pull out the remote whenever you need to take control of your device and no one will have any idea what's going on. You can bring this to a friends house and drive them nuts! Have fun, be safe!

## Step 4: How Does It Work?

This is a pretty simple concept. When you press a button on a remote crontrol for a TV, stereo or other IR device, it creates a series of pulses which the receiver in the target device; in this example, a TV, decodes into the corresponding function. This frequency is around 35-40kHz. To confuse the receiver, this jammer sends out a steady stream of binary code (1's an 0's) at the same frequency, but contains no information to decode. The receiver basically sits there and does not respond at all and the real information cannot get through to it as long as the jammer is on. Voila! You've 'jammed' your TV remote!
This project was featured in <a rel="nofollow" href="https://www.instructables.com/forum/Top-5-April-Fools-Day-Pranks-You-Can-Build-in-the/">Popular Mechanics Top 5 April Fools' Day Pranks!</a><br/>
cool
Does it work
<p>Is it a LM 555 timer or a NE 555 ?</p>
<p>I checked they are the same, but you should check just to be on the safe side.</p>
<p>Ok,I will! Thanks!</p>
<p>Here's one sight I found </p><p><a href="http://www.electronica-pt.com/datasheets/ne/NE555.pdf" rel="nofollow">http://www.electronica-pt.com/datasheets/ne/NE555.pdf</a></p>
<p>They are the same, but you should check to be sure.</p>
<p>when he means &quot;be safe&quot; he means dont get arrested for using the device </p>
<p>whats the freguency of yours?</p>
why do we need 2 leds, why cant just 1 led be fine?? <br>Plz answer soon kipkay.
<p>because two LEDs are more powerful than one</p>
There is a howcast video on YouTube showing how to do this exact thing much better than his video or instructable.
<p>Never thought this would be so cool</p>
Oh crap, here we go again! Can't I do a single Instructable without someone claiming it is harmful, illegal, immoral or dangerous?? Next time I will do one on how to watch paint dry. But then again you could hurt your eyes doing that. Geez!
<p>let bong pipes out and relax sir lol hahahaha</p>
i've got the evil genius book, and i reccomend it t anyone who like these sort of gadgets. it has tons of ideas and easy to hard projects to make. BUT from what i remember, yours doesn't copy the authors idea.
OMG. I heard these things violate FCC rule 332.23.a64 part d, subsection F, paragraph 9. This is so illegal, I can't believe you do these things. According to my research on the internets, this is very un-american, as only communists make these, and kittens die from exposure to the cancer rays. In seriousness: how does this jammer work? Is it basically so 'bright' that the receiver doesn't distinguish the IR signal from the real remote? Sorry, I should go to your website; but at the same time I think an instructable should have more instructions on it, rather than a link to the instructions. This is a cool device nonetheless.
Thanks for the input. I've added another step, How Does it Work. Let me know if I explained it well enough. Thanks!
would it be possible to make a bug lazer killer (you know like pointing a storong lazer at a bug and watch it cook) you can find that location of the bug in a 3D field useing a sonar device to see anything out of the ordinary feed back ( a distance only sensor will be needed to be triangulated with a second useing the same system, as will a direction only sensor) or a window blocker useing several strong lazers and a similar, but more mission impossible laser field array like the one used in a video of yours for cheap home protection
I looked inside my remote, and i saw a violet/dark purple led. <br>is it an IR led?
Ah, this is definitely well enough. Thanks!
It's FCC rule 332.23.a64 part d, subsection F, paragraph 8. Duh.
Close. It's FCC rule 332.23.a64 part d, subsection F, paragraph 8<strong>a</strong>, <strong>article 5</strong>, <strong>section 6b</strong>.<br/>
Where do you find the rules over 100? On the fcc site it only says 101 and stops.
Wooosh....
LOL.
Hold on, let me check again...Damn, you're right.
lol
no. the sun ( and light bulbs) puts out enough infrared light to do that.....if it where a problem. the receiver is designed to block out ambient light, and pick up only a certain frequency and signal.
FCC does not have a rule about it... Perhaps until someone hooks up a remote jammer to a million IRLEDs and turns off all the TV's in the metropolitan area during the big game.
Now thÃ¡t would be a fun project!
I hate those kinds of people!
oR YOU CAN BORE THE HELL OUT OF PEOPLE. i SERIOUSLY DON'T KNOW WHY THIS IS BAD, ACTUALLY ITS AWESOME
hello. i loved your videos man! i have the same taste and i used to wonder , would there be any one of this sort.. strengthening the remote signal is the easiest and can be implemented.
Yhep! those are the type I am trying to remove from nieghbor hood right now<sub>,need something safe yet annoying </sub>,know what I mean?<br/>
How do you type in <strong>superscript</strong> and <strong>subscript?</strong><br/>do you use html?<br/>&lt;s&gt;hmmm&lt;/s&gt;<br/>
I hear ya budy
more projects visit <br>http://www.excellentminds.in
1-these circuit design is something really stupid becuse your Power supply is 9v and diode's turn on in 1v together &quot;two diode&quot; they need 2v so that means voltage applied on output of 555 timer!!!<br><br>2-after that the collector current is 1 mA &quot;check whit multimeter or data sheet&quot; and it's not enough for turn on a infrared led it shod be 50 mA at least!!! <br><br>3-you shod apply voltage to only one pin of transistor...in these circuit you apply voltage on both bass and emitter!!!<br><br>all these are wrong in electronic theories so....<br><br>COULD YOU PLEASE ANSWER MY 3 QUESTION AND DO NOT REMOVE THEM AGAIN FROM YOUR SITE???<br>
Spell Check?
This is awesome. But my sister figured out what I was doing, and would not let me continue to hold the remote up. I am going to try and add more infrared LEDs so that it doesn't need to be aimed as precisely and looks less suspicious.
Kip you forgot the 180ohm resistor in the &quot;What you need&quot; section
when some one say's &quot; i use pcb &quot; that means 180ohm resistor cant be forgotten?!
hi<br>i build these circuit whit pcb and it dosen't work!<br>when you push a button on tv remote you can see LED's light whit mobile camera on top of the tv remote... it show's that LED work ...but in these circuit not?!
What 555 chips could I use I am using the 555CN (from radio shack) and my circuit is not working I have it on breadboard right now and am not sure what isn't working<br><br>Thanks.
I have it on a breadboard to with a 555CN and is not working etheir. Did you get your fixed and if you did can you tell me how you did yours?
if you like epoxy then use loctite epoxy works like magic
got similar circuit schematic but fewer parts.&nbsp;dont know if this one works or not. Or which one is better.. &nbsp; circuit copied from<br> <a href="http://www.simple-electronics.com/2011/09/tv-remote-jammer.html">http://www.simple-electronics.com/2011/09/tv-remote-jammer.html</a><br> <br> <br>