The transistor is commonly represented by a "Q" plus a number in the circuit. For example, Q17 represents a transistor numbered 17.
1. Features: A crystal triode (referred to as a triode) is a special device that contains two PN junctions and has amplification capability. It is divided into two types: NPN type and PNP type. These two types of triodes can complement each other in terms of working characteristics. The so-called tube in the OTL circuit is paired with PNP type and NPN type.
PNP type triodes commonly used in telephones are: A92, 9015 and other models; NPN type triodes are: A42, 9014, 9018, 9013, 9012 and other models.
2. The crystal triode is mainly used for amplifying in the amplifying circuit, and there are three connections in the common circuit. For the sake of comparison, the characteristics of the three connection circuits of the transistor are listed in the following table for your reference. Name Common emitter circuit common collector circuit (emitter output) Common base circuit input impedance (several hundred ohms to several thousand ohms) large (tens of thousands of ohms or more) small (several ohms to tens of ohms)
Output impedance (several thousand ohms to tens of thousands of ohms) small (several ohms to tens of ohms) large (tens of thousands of ohms to several hundred thousand ohms)
Voltage amplification factor (less than 1 and close to 1) Current amplification factor is large (tens of) Large (tens of) Small (less than 1 and close to 1) Large power amplification (about 30 to 40 dB) Small (about 10 dB) ) (about 15 to 20 decibels)
Frequency characteristic high frequency difference
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