Traditional Chinese Practical Eye protection photometer: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Practical Eye protection photometer. 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 1639 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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Eye protection photometerThe photometer made according to the circuit shown in Figure 6 can measure the light intensity of the measured point on the desktop when a person is reading or writing, and check whether it meets the requirements of eye care. It is especially suitable for primary and secondary school students to read and study.Figure 6The silicon photovoltaic cell BP generates a corresponding voltage when exposed to light. …

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