How to Read a Circuit Schematic

alan000345

How to Read a Circuit Schematic [Copy link]

The schematic diagram directly reflects the structure and working principle of the electronic circuit. How to read and follow the schematic diagram is a basic skill for electrical engineers. Here are five basic steps to read the schematic diagram. Step 1: Read the schematic diagram as a whole as you would read a text file. With a few exceptions, most schematic diagrams should be read from left to right and from top to bottom. The flow of current or the signal used in the circuit generally flows in this direction. It is easy to understand the schematic diagram below by reading it in this way.

Step 2: Associate the standardized symbols of basic components on the schematic diagram with real-world components and devices. Understand the basic parameters of the resistors, capacitors, inductors, switches, power supplies (DC, AC or battery), diodes, transistors, integrated circuits IC, MCU, others (crystals, connectors, motors, transformers, speakers and relays), fuses and PTCs in the schematic, and infer their uses in the circuit schematic. Understand the role of each grounding point in the circuit. Step 3: Find the actual parameters and performance descriptions of all components corresponding to the circuit schematic based on the bill of materials. In particular, refer to the user manual of the MCU used in the circuit schematic to clarify the purpose of each pin in the circuit. Step 4: Evaluate the working principle of the circuit. Based on the schematic, determine what functions the relevant parts of the circuit are used to perform. This will help you determine the performance function of the entire circuit. Step 5: Divide the circuit schematic into modules according to their functions. This will not only facilitate the location of damaged components corresponding to different equipment faults, but also serve as a reference for future related development.

This content was created by alan000345, a user on the EEWORLD forum. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

lzwml

Circuit diagrams are not difficult to read, but the people who draw them are used to it.

star_66666

Eat more, sleep more and you will understand

heningbo

A good habit for making schematics is to make a block diagram of the functions implemented by the schematic on the start page. This is very eye-catching. In addition, this thing is accumulated through experience.

alan000345

heningbo posted on 2018-8-30 08:48 A good habit for making schematics is to make a block diagram of the function implemented by the schematic on the start page. This is very eye-catching. In addition, this thing is accumulated through experience...

The block diagram of the function is indeed very important, especially when doing a new project.

懒猫爱飞

Function first, then details, it still depends on basic skills

alan000345

Lazy Cat Loves Flying posted on 2018-8-30 15:42 Function first, then details, it still depends on the basic skills

Yes, you are right.