Traditional Chinese Electronics: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Electronics. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 2076 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.

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electronic lockPlease throw away those old metal keys on your key chain and replace them with the "electronic keys" introduced in this article.As shown in Figure 24, the circuit of this device consists of two parts: a pocket-sized "key" powered by a battery and a "lock" that can only be opened by the "electronic key". The key is powered by a 9V battery, and the battery in the key also supplies the lock.The heart of the key is a 2-input quad NAND gate integrated circuit 4001. When the output signal from the key enters the input of the lockwas just opened. The 4001 integrated circuit and related transistors, capacitors, and batteries can be packed in a very small box, making it easy to carry around. …

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