Transistor in the circuit commonly used "Q" plus numbers, such as: Q17 said the number 17 transistor.
1, Features: Transistor (referred to as the transistor) is an internal 2 PN junction, and has the ability to enlarge the special device. It is divided into two types of NPN and PNP type, the two types of transistors from the working characteristics can make up each other, the so-called OTL circuit is PNP-type and NPN-type pairing.
2, the transistor is mainly used for amplifying the amplification circuit, there are three common ways in the connection. In order to facilitate comparison, the characteristics of the transistor connected to the three circuits are listed in the following table, for your reference.
Name of the total emitter circuit common collector circuit (emitter output) common base circuit
Input impedance (a few hundred European ~ a few thousand Europe) large (tens of thousands of European or more) small (a few European ~ dozens of European)
Output impedance (a few thousand European ~ tens of thousands of European) Small (a few European ~ dozens of European) Large (tens of thousands of European ~ hundreds of thousands of European)
Voltage magnification size (less than 1 and close to 1) large
Current magnification (tens) Large (dozens) Small (less than 1 and close to 1)
Power amplification factor (about 30 ~ 40 decibels) small (about 10 decibels) (about 15 ~ 20 decibels)
High frequency difference of frequency characteristic is good
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