Analysis of the working principles of seven triode collector DC circuits

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Analysis of the working principles of seven triode collector DC circuits [Copy link]

VII. Deformed Collector DC Circuit

The following figure is a deformed circuit of a transistor collector DC circuit. Q1 in the circuit is an NPN transistor, powered by a positive polarity DC voltage +V, R1 is a fixed bias resistor of the transistor Q1, and T1 is a transformer, whose primary winding L1 is connected to the collector loop of the transistor Q1.

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According to the collector DC circuit analysis method, there are two components between the collector of Q1 tube and the DC working voltage +V terminal, one is the primary winding T1 of transformer T1, and the other is capacitor C1. In this circuit, there is no resistance in the collector loop.

Since the capacitor has the characteristic of isolating DC power, capacitor C1 cannot constitute the collector DC current loop of Q1 tube. According to the characteristics of the winding, winding L1 can allow DC current to flow through, so the primary winding L1 of T1 constitutes the DC circuit of the collector of transistor Q1 in this circuit.

Characteristics of collector DC circuit

For a transistor working in the amplification state, no matter how the collector circuit changes, the collector of the transistor must form a DC loop with the DC working voltage terminal or the ground wire. It constitutes the DC path of the collector. The collector DC circuit of the transistor is to form a loop of the collector DC current.

As long as it is a component that can form a collector DC loop, it may be a component in the collector DC circuit. There are two connection situations between the collector of the transistor and the DC voltage terminal, or between the collector and the ground wire. 1. The collector is directly connected to the DC voltage terminal (there are no components in between). 2. Connected through a resistor or other components. These two collector DC circuits are related to what type of amplifier the transistor constitutes. Analysis method of collector amplifier circuit When analyzing this circuit, first find the transistor circuit symbol in the circuit, then find the collector of the transistor, and search for components from the collector to the DC voltage end or the ground end. The resistors or inductors and transformers among these components are likely to be components that constitute the collector DC circuit, especially the resistors. Capacitors can be ignored because they have the function of isolating DC current and cannot constitute a DC circuit. Capacitors can be ignored because they have the function of isolating DC current and cannot constitute a DC circuit.