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 denglei@dgut.edu.cn https://leideng.github.io/communication-english/ (Some pictures are from the Internet) 东莞理工学院 电子工程与智能化学院 2018.10.16/17

Outline Technical Contents Technical Terms General Principles Rules and Hints Illustration Technical Terms

General Principles Schematics should be unambiguous.

General Principles A good schematic makes circuit functions clear.

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

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

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

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

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

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

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

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

Illustration of A Good Schematic

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

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