As a qualified engineer, you need to remember these circuit diagrams throughout your life!

 1. Signal filter

1. The function of signal filter:

Differences and similarities with power filters:

2. Impedance calculation of LC series and parallel circuits, amplitude-frequency relationship and phase-frequency relationship curve.

3. Draw the passband curve.

Calculate the resonant frequency.

2. Differential and integral circuits

1. The function of the circuit, the differences and similarities with the filter.

2. Analyze the voltage change process of differential and integral circuits and draw voltage change waveform diagrams.

3. Calculation: time constant, voltage change equation, selection of resistance and capacitance parameters.

3. Common emitter amplifier circuit

1. The structure of the triode, the current relationship between each pole of the triode, the characteristic curve, and the amplification conditions.

2. The role of components, the purpose of the circuit, voltage amplification factor, input and output signal voltage phase relationship, AC and DC equivalent circuit diagrams.

3. Calculation of static operating point and voltage amplification factor.

4. Voltage-biased common-emitter amplifier circuit

1. The role of components, the purpose of the circuit, voltage amplification factor, input and output signal voltage phase relationship, AC and DC equivalent circuit diagrams.

2. Analysis of the current series negative feedback process and the impact of negative feedback on circuit parameters.

3. Calculation of static operating point and voltage amplification factor.

5. Common collector amplifier circuit (emitter follower)

1. The role of components, the purpose of the circuit, voltage amplification factor, input and output signal voltage phase relationship, AC and DC equivalent circuit diagrams. Input and output impedance of circuit

Features.

2. Analysis of the current series negative feedback process and the impact of negative feedback on circuit parameters.

3. Calculation of static operating point and voltage amplification factor.

6. Circuit feedback block diagram

1. The concept of feedback, positive and negative feedback and their judgment methods, parallel feedback and series feedback and their judgment methods, current feedback and voltage feedback and their judgment methods.

2. Amplification gain with negative feedback circuit.

7. Diode voltage stabilizing circuit

8. Series regulated power supply

9. Differential amplifier circuit

10. Field effect tube amplifier circuit