The concept is pretty simple and easy.You press a button. When you do that you complete a specific connection. The chip senses that connection and knows what button you pressed. It produces a morse-code-line signal specific to that button.
The transistors amplify the signal and send them to the infrared LED
, which translates the signal into infrared light
. The sensor in the TV can see the infrared light and "seeing" the signal reacts appropriately.
The frequency of this transmission is between 35kHz to 40kHz(38kHz in most of them).What the jammer does is that it sends out a steady stream of binary code
at the same frequency as of the remote.The TV cannot decode as it contains no information.
The information transmitted by the remote does not get pass through as the jammer is on and does not respond at all.
So, the remote is jammed and you can tune in on to one channel and give away the remote.