We’ve already seen how to jam mobile signals with a simple mobile jammer circuit in previous postings. Now, in this project, we’ll learn about another intriguing concept: the TV Remote Jammer Circuit, which is a simple and practical circuit based on the NE555 Timer IC.
- Introduction
- TV Remote Control Jammer Principle
- Features of RC5 protocol
- TV Remote Control Jammer Circuit Diagram
- TV Remote Jammer Design
- TV Remote Jammer – Circuit Simulation Video
- How to Operate this TV Remote Jammer Circuit?
- TV Remote Jammer Advantages
- Limitations of the Circuit
Introduction
This project’s TV jammer circuit confuses a TV’s infrared receiver by providing a continuous signal that interferes with the remote control signal. The TV will not respond to any commands from the remote if the circuit is just turned on once. This lets you to enjoy your own show without having to worry about someone else adjusting the channel or loudness.
Infrared light is the primary technology utilised in TV remote controls. Although infrared light is undetectable to the naked eye, we can view it through a camera.
TV Remote Control Jammer Circuit Principle
The idea behind the TV remote control jammer is to send a steady IR pulse with the transmitter’s carrier frequency. As a result, the receiver will provide a non-accepted signal, and no action will be done.
When you push a button on the TV remote, it sends out a series of pulses. The IR transmitter is permanently attached to the TV remote’s surface. This infrared transmitter sends out pulses in a different pattern for each button.
The IR receiver, which is mounted on the TV, receives the sequence of pulses transmitted by the TV Remote and determines which button is pressed.
Generally Philips TV remotes follows RC5 (Remote Control) protocol. This protocol was developed by Philips in the late 1980s. According to this protocol, for each button, Remote transmits 14 bits. The below figure shows the frame format of RC5 protocol.
Both of the first two pulses are logic 1 start bits.
The toggle bit is the third bit. When a button is pressed or released, this bit is toggled. We can tell if the button is pressed or not by looking at this bit.
The device address is represented by the next 5 bits. Bit 4 is the device address’s MSB, while bit 8 is the device address’s LSB.
The command bits are the last six bits in the frame format. Each button on the remote has its own set of command bits. We can determine which button in the IR remote is pressed using these command bits.
Features of RC5 protocol
- Bi-phase coding (Manchester coding)
- 36Khz or 38Khz carrier frequency
- Constant bit time of 1.778 ms
- 5 bit address and 6 bit command length
Modulation: The RC5 protocol uses bi – phase modulation. All 14 bits are equal length of 1.778ms.
TV Remote Control Jammer Circuit Diagram
Circuit Components
- NE555 timer
- 1N4148 diodes – 2
- Resistors – 470 Ω, 1KΩ, 5R6 (5.6Ω)
- POT – 10KΩ
- 9V Battery
- Ceramic capacitor – 10nF
- Transistor – NPN (BC547)
- IR – LED
TV Remote Jammer Circuit Design
The circuit is meant to generate a signal at a frequency of 38 kHz. The 555 Timer is the circuit’s main component. It’s in astable multivibrator mode right now. The 2nd and 6th pins are shorted in this circuit to allow triggering after each timing cycle, and these two pins are grounded via the capacitor. To avoid unexpected resets, the 555 timer’s fourth pin is connected to the power supply.
10KΩ pot is used to adjust the frequency of 555 timer. The current through the IR-LED is limited to 100mA because of two 1N4148 diodes, as these form constant current arrangement when combined with transistor and resistor.
TV Remote Jammer – Circuit Simulation Video
How to Operate this TV Remote Control Jammer Circuit?
- Connect 9V battery to the circuit.
- Now adjust the pot 10KΩ to produce 38 KHz signal.
- Now press the TV remote buttons.
- You can observe that TV will not receive any commands from remote
- Disconnect the battery from circuit and press TV remote buttons.
- Now you can observe that TV will receive the commands from Remote
TV Remote Control Jammer Circuit Advantages
- We can use this circuit to jam the remote signals so that the other people cannot change the channel while watching our favorite program on TV.
- It will not affect the signal receiving capacity of the TV.
Limitations of the Circuit
- The circuit should be tuned correctly to 38 KHz frequency to get accurate results.
