Just point this small device at the TV and the remote gets jammed . The circuit is self explanatory . 555 is wired as an astable multivibrator for a frequency of nearly 38 kHz. This is the frequency at which most of the modern TVs receive the IR beam . The transistor acts as a current source supplying roughly 25mA to the infra red LEDs. To increase the range of the circuit simply decrease the value of the 180 ohm resistor to not less than 100 ohm.
It is required to adjust the 4.7K potentiometer while pointing the device at your TV to block the IR rays from the remote. This can be done by trial and error until the remote no longer responds.
Scheme remote control blocker with NE555
Suggested printed circuit board for mounting the circuit
Part list for assembly TV remote control Blocker Circuit
|Resistor’s 1/4 Watt 5%|
|R1||1K -Brown, Black, Red, Gold|
|R2||470 – yellow, violet, brown, gold|
|R3||1.5K – Brown, Green, Red, Gold|
|R4||220 – Red, Red, brown, gold|
|C1, C2||10nF – Polyester or Ceramic Capacitor|
|C3*||Add a 100nF bypass capacitor in parallel with the 9-volt battery|
|IC1||555 – Integrated circuit timer, can be NE555, LM555 or other prefix|
|LED1, LED2||Infrared LEDs used in remote controls|
|P1||Trimpot of 4.7K|
|Printed circuit board, 9v battery, battery clip, wires, soldering, box, etc.|