# TV Remote Jammer!

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## Introduction: TV Remote Jammer!

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!

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## 253 Comments

cool

Does it work

Is it a LM 555 timer or a NE 555 ?

4 replies

I checked they are the same, but you should check just to be on the safe side.

Ok,I will! Thanks!

They are the same, but you should check to be sure.

when he means "be safe" he means dont get arrested for using the device

whats the freguency of yours?

why do we need 2 leds, why cant just 1 led be fine??
Plz answer soon kipkay.

1 reply

because two LEDs are more powerful than one

There is a howcast video on YouTube showing how to do this exact thing much better than his video or instructable.

Never thought this would be so cool

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!

4 replies

let bong pipes out and relax sir lol hahahaha

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!