Practical Time Control Health Light: Traditional Chinese Circuit Desig
In short: Traditional Chinese Practical Time Control Health Light. 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 5443 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Time control health lampThe vision care of teenagers has become a concern of today's society. With the demand for vision care, various health care lamps have emerged. Most of the health care lamps currently on the market have single functions and have little effect. The novel time simulation health care lamp integrates the three functions of time simulation, low brightness warning and dimming, and adopts two health care measures: First, the lighting and extinguishing time of this lamp can simulate the school schedule (i.e. 45 minutes on, 15 minutes off, and so on), so that the eyes can work After a period of time, rest for a period of time so that the eyes will not be overtired and cause vision damage; secondly, it can automatically detect the brightness of the light. When the brightness of the light is lower than the allowable value 1001x (regulations of the National Education Commission), it will issue an audible and visual warning to remind you that this brightness is not suitable for writing and learning.Figure 159How it works:The circuit is mainly composed of a time analog control circuit, a light brightness automatic detection circuit, a low brightness warning circuit, a light brightness adjustment circuit and two independent DC regulated power supplies. The circuit schematic diagram is shown in Figure 159. The time analog control circuit is an astable circuit with adjustable space ratio composed of IC2, R10, R11, C9, etc. When the power supply is connected, the power supply charges C9 through R10 and R11. Since the voltage of the two temples of C9 cannot change suddenly, the ③ pin of IC2 outputs a high level, the relay is closed, and the controlled lamp power supply is turned on for lighting. …
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Lei Cheng
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