1. 通信工程专业英语(本) Lesson 15 How to Draw Schematic Diagrams 第15课 如何绘制原理图
邓 磊
(Some pictures are from the Internet)
东莞理工学院
电子工程与智能化学院
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2. Outline Technical Contents Technical Terms General Principles
Rules and Hints
Illustration
Technical Terms

3. General Principles
Schematics should be unambiguous.

4. General Principles
A good schematic makes circuit functions clear.

5. Rules and Hints
R3: Always use the same symbol for the same device.

6. Rules and Hints
R5: Label pin numbers on the outside of a symbol, signal names on the inside.

7. Rules and Hints R6: It’s best to give all parts a label.
Use abbreviation, e.g., D2, R1, etc.

8. Rules and Hints
H1: Identify parts immediately adjacent to the symbol.

9. Rules and Hints
H2: Signals go from left to right.

10. Rules and Hints
H3: Put positive supply voltages at the top of the page, negative at the bottom.

11. Rules and Hints
H4: Use the ground symbols and/or labels to indicate those voltages where needed.

12. Rules and Hints
H7: Leave some space around circuit symbols.

13. Illustration of A Good Schematic

14. Technique Terms schematic n. 电路原理图 troubleshooting n. 故障排除 pin n. 引脚
register n. 寄存器
shift register 移位寄存器
counter n. 计算器
supply voltage 电源电压
common ground wire 公共地线

15. Thank You!