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In order to provide speakerphone reception of a large number of radio stations, you need millions and billions of times the power of the received signal supplied to the antenna. Such a huge power gain can get transistors and vacuum tubes.
MAGIC LAMP.
With the help of an oscillatory circuit we were able to slightly increase the sensitivity of the receiver - helped to outline the best use of energy, which brought radio to the antenna.
But the power of signals acting at the antenna is usually so small that all the "efforts" of the tank circuit are completely inadequate to get a speakerphone device. You have to find a fundamentally new way to increase the volume receiving: Use vacuum tubes or transistors - transistors that can be used many times to strengthen the power of received signals.
Many books are called vacuum tube magic. And this is no exaggeration lamp can really do wonders: Leads to a weak electrical signal lamp and the lamp goes out, this signal amplified a thousand times. Why not a miracle! But we all know perfectly well that there are no miracles or the circus or the technique, and therefore try to understand how the "magic" amplifying devices: Electron tube and its closest aide - transistor.
To begin with, that strictly speaking, neither the lamp nor the transistor does not amplify electrical signals and cannot increase: the weak electrical signal that we are taking to the lamp, and remain a weak signal. What's happening in the vacuum tube amplifier or a semiconductor,
resembles the process of making great photos with the small size of the negative. With the enlarger, having spent some light energy, we are on a large sheet of photographic paper creating a new image - an enlarged copy of a small negative, which plays a role sample. |