Introduction: When it comes to triodes , we can immediately imagine that it can amplify the current. When the current flows from the base to the collector, it is unknowingly amplified by a factor of β. So does the triode only perform current amplification? Can it still perform other tasks?
Transistor role - - what is the transistor
Triode, the abbreviation of semiconductor triode, we often refer to it as bipolar transistor, crystal triode. A triode is a basic current-controlled current semiconductor component that has the function of current amplification and is the core component of an electronic circuit. It has been widely used in various functional circuits in various fields.
The role of the triode - - current amplification
One of the functions of the triode is current amplification, which is also its most basic role. Taking the common emitter connection method as an example, once a small current is input from the base, the current output at the collector is β times the input current, and β is called the current amplification factor of the triode. The input weak signal is amplified by β times and output, which is the current amplification effect of the triode.
The role of the triode II - used as a switch
The second function of the triode is to act as a switch. When the triode is saturated, its voltage between the CE poles is very small, lower than the conduction voltage of the PN junction, and the CE pole is equivalent to a short circuit. The "switch" is in an open state; when the triode is in the off state, the current between the CE poles is very high. Small, equivalent to an open circuit, the "switch" is in a closed state. Therefore, the function of the switch can be completed, and the switching speed is extremely fast, the control is sensitive, and no spark is generated.
The role of the triode - three - flow
The third function of the triode is the expansion, and in some cases, the current limit or capacitance can be expanded. For example, combining low-power thyristor with high-power three-stage tube can obtain high-power thyristor and expand the maximum output current value; in the long-delay circuit, the triode can complete the function of expanding the capacitance.
The role of the triode - four - replacement
The fourth function of the triode is the substitution function. Under certain circumstances, combined with some electronic components, other devices can be replaced to complete the corresponding functions. For example, two triodes can be substituted for the bidirectional trigger diode in the dimming table lamp; in some circuits, the triode can replace the 8V regulator tube, replace the 30V regulator tube, and so on.
The role of the triode
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