![]() ![]() Similarly, when the magnification of the triode is 100 and Ib (base current) is 1mA, a current of 100mA is allowed to pass through Ice. If the magnification is 100, then when the small blue water flow is 1 kg/hr, then the big pipe is allowed to flow 100 kg/hr of water. When the blue water flow is larger, the red water flow in the large pipe is also larger. The small blue water flow impulse lever in the thin tube on the left widens the valve of the large water pipe, allowing a larger flow of red water to pass through the valve. It is a device that drives the current Ic flowing through ce with b (base) current Ib, and its working principle is very similar to a controllable valve. Here we take the NPN triode as an example to explain its working principle. NPN and PNP are mainly different in the direction of current and the positive and negative voltage. The structure and symbol of the triode are shown in the figure below. Other triodes also extend their functions based on this principle. What we generally call an ordinary triode is a device with current amplification. The digital circuit mainly uses the switching characteristics of the triode, and only uses the two states of cut-off and saturation. The enlarged state is mainly used in analog circuits, and the usage and calculation methods are relatively complicated, so we will not use it temporarily. The principle of the triode has three working states: cut-off, amplification, and saturation. It can also be described as a triode where current flows from the emitter E. The PNP-type transistor is a transistor composed of two P-type semiconductors sandwiching an N-type semiconductor, so it is called a PNP-type transistor. The NPN transistor consists of two N-type semiconductors and one P-type semiconductor, with the P-type semiconductor in the middle and two N-type semiconductors on both sides. Among them, 90 are npn type transistors, which can be used universally. Among them, 90 are pnp transistors, which can be used universally. The main function of the triode in the single-chip microcomputer application circuit is the switching function. Both of them have the same working principle except for the polarity of the power supply. Each of them has two structural forms, NPN and PNP, but the most commonly used transistors are silicon NPN and PNP. There are two types of triodes: germanium tubes and silicon tubes. The triode is the most important device in an electronic circuit, and its main function is current amplification and switching. What are the NPN transistor and PNP transistor? ![]()
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