Then understand the two simplest connection methods of the circuit, and be familiar with the relationship between current and voltage resistance in series and parallel.

Then understand the various formulas of the circuit clearly, such as ohm's law, electric power and other formulas.

Regardless of strong current, weak current, analog and digital, we must first understand the component symbols of each unit; Both the old and new national standards must be recited; Familiar with the working principle, characteristics and functions of each unit; Familiar with the working principle and analysis method of various basic unit circuits.

The Legend of Typical Circuits for Practical Electricians published by Water Resources and Hydropower Publishing House contains detailed explanations of various basic electrical unit legends, as well as some typical schematic diagrams of the whole machine and power distribution, which is very beneficial to beginners and intermediate learners.

Equipped with integrated circuit manuals (with block diagrams of commonly used integrated circuits and the functions of each pin), which can be bought in major bookstores. Beginners should not look at the circuit diagram of the whole machine first, but step by step.

Because there are many unit circuits in the circuit diagram of the whole machine, some components in the unit circuits are scattered or far away from the units, so it is very difficult for beginners to read the drawings.

Starting from the block diagram-unit circuit diagram, the equivalent circuit diagram-complete machine circuit diagram covers a wide range. It takes a long time to understand a complete circuit quickly, which is not clear here. Step by step learning is very important, and the theoretical basis of electricity is very important. As the saying goes, being professional and eager to learn, it is difficult for the foundation to get quick success from the beginning, and it will soon encounter bottlenecks.

If you have a basic knowledge of electricity, it is suggested that you study Digital Circuits of Electrotechnics published by Higher Education Press first, which is a difficult point in the circuit diagram. Let me briefly talk about the knowledge of digital circuits, which can be learned step by step:

1, binary and binary coding, and the conversion relationship with decimal.

2, pulse circuit (pulse signal generation, shaping, alternating. Include differential circuit, integral circuit, limiting circuit, multi-resonant oscillation circuit, monostable and bistable circuit, etc. )

3. Logic gates (AND, OR, NOT, NAND, NOR gates)

4. Trigger circuit (RS trigger, JK trigger, D and T trigger are required)

5. Combinatorial logic circuit (basic arithmetic unit, comparator, parity judging circuit, encoder, decoder and data selector)

7. Single chip microcomputer 8. Conversion between analog quantity and digital quantity

Many functions of digital circuits are realized by software, which is beyond the scope of electronic technology analysis. Although you don't need to be familiar with software, you must know the process, purpose and result of software processing signals.

Single chip microcomputer is also one of the difficulties. After you have the basic knowledge of digital circuits, you must be familiar with them.

Because the signals of digital circuits are digital signals of various pulse trains, the waveforms of these data stream signals can not be as helpful to the understanding of circuits as analog circuits, so we should be psychologically prepared.