If like me, you like to take things apart to see how they work this is an article for you. Ever wondered how a TV works? Well here it is
A TV is split into two parts- the video and sound circuits and the TV tube. I will first explain the video and sound circuits. They appear similar to the below.
Aerial T uner- sound decoder- sound amplifier loudspeaker - Video decoder video amplifier TV Tube.
Let me explain The aerial first receives the radio waves and conducts these to the tuner - the tuner then selects one channel from hundreds. After that, the wave is split into two parts sound and video. The sound and video then move along two separate circuits. The waves are first chopped in half by the decoders. The signal moves onto the amplifiers which with aid of a battery enlarge the wave so that it is stronger. The sound is the played out from the loudspeaker and the video is produced by the TV Tube.
The TV tube is made of three parts screen, electron gun and deflection system. The electron gun fires tiny particles called electrons at the screen. The electrons hit little phosphor dots more dots better picture quality and produce colour dependant on the numbers of electrons and the dots that they hit. The deflection system simply aims the electrons to hit the correct dots to produce the desired picture.
The TV can only work because of a thing called persistence of vision. Persistence of vision means that we remember a picture for longer than the time for a new one to appear. Our brain remembers an image for 1/25 of a second, whereas a new picture is produced every 1/10 of a second.
Now, we have seen into the secret life of a TV lets look at our TV differently from now on. The TV is quite amazing.
P.S. The TV was a British invention; invented first by John Baird.
Connor Davidson 4/03/09
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