The 555 IC is used in a TV remote signal jammer circuit to mislead the TVs infrared receiver by continuously generating an infrared pulse at the transmitters carrier frequency.
You can watch your show uninterrupted since this interference stops the TV from receiving remote control signals.
An IR LED, a ceramic capacitor, an NPN transistor, a potentiometer, resistors and a 9V battery are among the circuits parts.
Circuit Working:
Parts List:
| Category | Description | Quantity | Wattage |
|---|---|---|---|
| Resistors | 1k | 1 | 1/4W |
| 10k | 1 | 1/4W | |
| 220Ω | 1 | 1/4W | |
| 10Ω | 1 | 1W | |
| Potentiometer | 100k | 1 | |
| Capacitors | Ceramic 10nF | 1 | |
| Semiconductors | IC 555 | 1 | |
| Transistor BC547 | 1 | ||
| IR Transmitter LED 5mm | 1 | ||
| Power Source | 9V Battery | 1 |
The IC 555 chip, which is set up as an astable multivibrator is used in the circuit.
As a result, a constant stream of square wave pulses is produced at a frequency that VR1 can tune between 32 and 40 kHz.
The 38 kHz carrier frequency is used by many TVs for remote control transmission.
An Q1 transistor is supplied the square wave output.
The IR LED is turned on and off at the same frequency by the transistor, which functions as a switch.
The TV remote control signal is replicated by the infrared light pulses that the IR LED generates.
These continuous pulses confuse the TV making it unresponsive to the genuine remote control.
To adjust the frequency to the TV remotes carrier frequency which is typically 38 kHz, use the potentiometer VR1.
When the jammer is set to active, the TV will not react to remote control signals.
Formulas:
A continuous wave signal at a certain frequency is usually generated while designing an astable multivibrator for a TV remote signal jammer circuit in order to disrupt the signals coming from the remote control.
For this reason, you may use the IC 555 formula to setup the astable multivibrator as follows:
Frequency (f):
The settings of R1, R2 and C1 define the oscillation frequency in the astable mode:
f = 1.44 / (R1 + 2 * R2) *C1
where,
- F is the frequency in hertz Hz,
- The resistances in ohms Ω are represented by R1 and R2,
- The capacitance in farads F by C1.
This equation and arrangement serve as a foundation for creating an astable multivibrator circuit for a TV remote signal jammer application by utilizing the IC 555.
Specific frequency needs and performance objectives should be taken into consideration when making adjustments to R1,R2, and C1.
How to Build:
To build a Simple TV Remote Signal Jammer Circuit follow the below mentioned steps for connections:
- Gather all the circuits parts as mentioned in the diagram above:
- Connect pin 1 of IC 555 to ground.
- Connect pin 2 to pin 6 of IC 555.
- Connect pin 3 of IC 555 to the base of transistor Q1 through resistor R3.
- Connect pin 4 to positive supply of +9V.
- Connect pin 6 to to pin 2 of IC 555.
- Connect resistor R2 between pin 6 and pin 7 of IC 555.
- Connect a capacitor C1 from pin 2 and pin 6 of IC 555.
- Connect pin 7 of IC 555 to center leg of VR1.
- Connect pin 8 to pin 4 of IC 555 to positive supply of +9V.
- Connect a VR1 upper leg to pin 4 and pin 8 of IC 555 through resistor R1
- Connect collector of transistor Q1 to positive supply through IR LED, connect base of transistor Q1 to pin 3 of IC 55 through resistor R3, connect emitter of transistor Q1 to ground through resistor R4.
Important Notes:
- This circuit is solely intended for instructional use.
- Different TVs may communicate using different infrared IR frequencies.
- The frequency of the circuit might need to be changed to accommodate your particular TV.
- For optimal results, place the IR LED in this circuit next to the TV and point it straight at it.
Conclusion:
This simple TV remote signal jammer circuit provides a means of producing a signal that could interfere with a TVs capacity to receive orders from a remote control.
This is just for instructional reasons, interfering with other devices by altering electronics may be immoral and in certain places even criminal.
Electronic circuits should always be used for genuine purposes first.
References:
DEVELOPMENT OF TV REMOTE JAMMER CIRCUIT USING 555 TIMER IC AND INFRARED LIGHT EMITTING DIODE