The following two methods can be used to distinguish triodes and tubes when used as switches. , Working properties
, The transistor is controlled by current, and the tube is controlled by voltage.
Cost issues Transistors are cheap, but tubes are expensive.
. Power consumption problem. The transistor has a large loss.
Driving power tubes are often used in power switches and high-current local switching circuits.
The difference between field effect transistors and transistors
Field effect transistors are voltage control components, while transistors are current control components.
Field effect transistors are divided into two categories: junction type and insulated gate type, and their control principles are the same.
Field effect transistors can work under small current and low voltage conditions and are widely used in large-scale integrated circuits.
Field effect transistors use majority carriers to conduct electricity and are called unipolar devices. Transistors use both majority carriers and minority carriers to conduct electricity and are called bipolar devices. .
The source and drain of some field effect transistors can be used interchangeably, and the gate voltage can be positive or negative, which is more flexible than transistors.
Field effect transistors have the advantages of high input impedance and low noise, and are widely used in various electronic devices. In particular, field effect tubes are used as the input stage of the entire electronic device.
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