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AC voltage, which should be strengthened, for example, AC RF, which acts on the circuit, or low AC voltage, which can be obtained from the detector is fed to the transistor so that it operated between the emitter and base and would manage the size of the current in the emitter junction. At the same time under the influence of the amplified AC current changes emitter junction, that is changing and the number of positive charges, which come from the emitter to base, and then pass into the collector circuit.
Thus, just by following all the changes of the amplified signal, the collector current changes - there is a "powerful copy" of the amplified signal. Energy on the creation of this "powerful copy" received from the collector battery, and the role of the emitter junction is reduced only to ensure that "deliver" the positive charges necessary for the formation of the collector current, and adjust the amount of "delivered" the charges in accordance with changes in the amplified signal.
Since the emitter junction is included in the forward direction, then the required current emitter polymer chain, i.e. the required number of moving charges can be obtained at low voltages, amplified.
As you can see, the transistor is no strong, in the amplified signal does not. If we are talking about electric power, it stands for a load resistance only because this resistance is connected to a battery with a sufficiently large emf But if we simply connected the load to the battery, the circuit would precede conventional DC. Just because we, together with the load connected to the battery transistor, we have the opportunity to manage the current which passes through the load, and changing it to "model" - the input signal - to receive "strong copy" of the signal. Using transistors, you can build relatively simple crystal receivers, where the transistor is not only reinforces but also detects the signal. Transistor to control current in the simplest way - with his help, we simply change the number of charges that fall from the base to the collector circuit and can participate in creating a current through the load.
Manage these shocks can be another way, for example, as is done in vacuum tubes. |