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/>
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>
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>
can you use a different pot value cause a 10k $9.00 here
only 10 inr in india<br>
It only costs around 2$ at my store. They sell a LOT&nbsp;of stuff.<br /> http://www.halted.com/commerce/catalog/spcategory.jsp;jsessionid=BD906DB46CE24400663B07230F9C0CA2?category_id=1122&amp;czuid=1270689974389<br /> I go there physically. Its located near my house so i dont have to pay shipping<br />
&quot;We've been jammed sir!&quot;<br>&quot;Raspberry!...&quot;<br>SPACEBALLS!!!!
Only one man would dare give me the raspberry! LONESTAR!!!!!!!
can anyone plz specify abt the sign of the capacitor
where does the 9v negative connect to? and why is there a GND at the bottom?
Where is the Hex file to program the 555 timer?
never mined i was thinking straight sorry
you cant program a 555 timer<sup>or can you!!(no really i dont know)</sup><br/>
no you can't it's a bi-stable timer I.e it has two states,both unstable. you control the flow into the capacitor with the preset, and that sets the reset, fliping between the two states. you can program a PIC chip (progamable input chip) i.e a geinieC08 chip - an 8 pin chip 4 possible out puts - 0,1,2+4 and one input - 3.<br>
i know it was a joke.....(good info though)
program it?why do you want to program it??
would these work? http://www.cricklewoodelectronics.com/Cricklewood/product.php?productid=20865&amp;cat=0&amp;page=1
How do yo adjust the frequency??????
you can adust the frequency by adjusting the preset (variable ressistor)
<p>how could I get a longer range? the one I've built only works when I bring it close to the tv..</p>
you can use tin foil to make a &quot;reflector&quot;. Just place behind the LEDs in a three- wall configureation (or a U) and it should up the range if you point it at the set and remove any obstructing materials can't do too much harm. be careful not to short the LEDs out and g-luck!
The other remote controls IR leds make a stronger signal at that the ones on this circuit
Use HIGH&nbsp;powered IR&nbsp;leds or use IR&nbsp;leds and IR&nbsp;laser of low power <br />
Kipkay you forgot to put on the resistors the 180ohm resistor<br>though everyone should realize it from the 4 resistors.<br>Really nice prank BTW. ty
There's a video from Howcast showing how to make this same project.... i wonder why....
yo kipkay ive watch loads of your videos but this one is not always a good idea my tv and im sure plenty others have buttons on the front

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Bio: Tinkerer, hackster and prankster. Hit me up on Facebook: https://www.facebook.com/kipkayvideos/ Thanks for checking out my Instructables!
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