Traditional Chinese Practical Convenient lighting: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Convenient lighting. 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 2755 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Convenient lightIn offices, studios or libraries, conservatories, corridors, foyers, etc., it is often necessary to use one light to control other lights. For example, when you want to leave the office, you should turn off the indoor lights to avoid wasting electricity. However, after turning off the lights, the room will become dark and it will be inconvenient to even walk or open the door. At this time, it would be great if there was a light in the hall that could light up automatically, and when you go out and close the door, you could go down and turn it off after a minute or two. The circuit described below is designed for this purpose.The circuit is shown in Figure 18. Its circuit is not complicated and mainly consists of a 2-input four-NAND gate integrated circuit 4011, two NPN low-power transistors, a photovoltaic cell or photosensitive transistor and several resistor-capacitor components. …
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