Correctly analyze the role of discrete components in the circuit - resistors, capacitors, inductors, diodes, transistors (II)

Inductor:

The role of the inductor in the circuit is to filter and store energy. The main feature of the inductor is DC and AC.

diode:

The role of the diode in the circuit has many functions such as rectification and voltage regulation.

1. Connected in parallel with the inductor coil to provide a freewheeling action to prevent the reverse self-inductive electromotive force in the inductor from damaging the transistor device in the circuit when the inductor is powered off.

2. Connected to the base terminal of the transistor in parallel with the input signal of the amplifying circuit, which functions as the limiting and clamping of the input circuit. In the above "resistor to transistor connection" circuit, diode D4 is a reverse limiting diode, and diodes D5, D6 are forward limiting diodes.

3. Connected to the secondary side of the pulse transformer to prevent backflow.

Transistor:

The transistor acts primarily in the circuit to amplify the signal. Of course, there is another role.

1. Transistors can form various amplifying circuits in a circuit. For example, a common emitter circuit, a common collector circuit, a common base circuit, and the like.

2. The transistor acts as a non-linear resistor in the circuit. For example: in constant current circuits and series DC regulated power supplies.