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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 10K 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.
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