Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版:英文原文完整保留,中文紧随对应单元;术语采用 v20260916 确认表,自动语义审校结果可追溯。

NAND Gate from IC 7400

IC 7400中的NAND门

Example from IC7400 quad NAND gate used in TTL logic.

IC7400四选一与非门在TTL逻辑中的应用示例。
Basic Gates
基本逻辑门
Index

Electronics concepts

Digital Circuits
索引 电子学概念 数字电路
 
HyperPhysics*****Electricity and magnetism
HyperPhysics ***** 电磁学
R Nave
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