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It is important to note that when a positive voltage on the grid it will get some of the electrons, which, after passing the outer grid circuit, will return to the cathode. In other words, when a positive voltage on the grid in the tube there is a grid current. The graph shows how the anode and grid current when the voltage on the grid, called the anode-grid characteristic of the lamp, and the schedule in which there are several curves plotted at different anode voltages, called the family of characteristics.
If between grid and cathode will operate alternating voltage signal is amplified, then it will cause a corresponding change in plate current. But changing the anode current is still not profit, as well as and does not do useful work, driving on the highway empty truck. In order for a powerful engine of the truck, constantly burning fuel, doing some good work, you need to fill this car body heavy weights "for the same, to use the energy of changing the anode current of vacuum tube, that is, identify the" strong copy "of the amplified signal, anode circuit of the lampas well as in the collector circuit of transistors include load. The load can be a normal resistance, speakerphone, an oscillating circuit, phone, etc. Going through the load, the anode current will allocate its portion of its energy. This energy will be either through the speaker phone or immediately converted into sound waves, or be subjected to further strengthen through the next lights. As already mentioned, when a stage does not provide sufficient gain, the input signal, a somewhat strengthened the first stage is transferred to the second, where it is amplified even more with the second-stage amplified signal is fed to the third, and so on.
Depending on the purpose of an amplifier stage or are seeking a large alternating current in the load (this load resistance makes small), or high voltage (this makes a big load resistance). However, any ratio of voltage and current in the load capacity allocated to it that is power amplified signal is many times more power consumed in the grid circuit to control the anode current. We note in passing that the grid circuit of an electronic tube commonly referred to as the input circuit and an anode - closed. |