Traditional Chinese Reading Ambient Illumination Monitor (Workshop Practice) — Circuit, Wiring & Debug Guide
In short: Traditional Chinese Reading Ambient Illumination Monitor (Workshop Practice) — Circuit, Wiring & Debug Guide. 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 4615 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Reading Ambient Illumination MonitorOne of the reasons for vision loss is that the light in the reading and writing environment is too dark, which accelerates eye muscle fatigue. Over time, it can lead to myopia. According to eye health knowledge, when reading and writing, the illumination of the desktop should not be less than 1001x. Usually people cannot measure whether the illumination meets the requirements by visual inspection.If the illumination monitor is placed on the table, once the illumination is not lower than 1001x, the speaker will immediately sound a music sound to warn. When the illumination reaches or exceeds 1001x, the speaker will be silent. In this way, you can check and monitor whether the illumination meets the requirements, protect your eyesight, and improve learning and work efficiency.Circuit principle:The circuit principle of the illumination monitor is shown in Figure 160. VT1 and VT2 (3DG6) form a differential amplifier circuit to improve stability. The photoresistor RG8 is the upper bias resistor of VT1, VT3 (3CG13) is used as a switch to control the operation of the music integrated circuit IC, and VT4 (3DG12) is used as a power amplifier to drive the speaker to produce sound.Figure 160Since the resistance of the photoresistor changes with the illumination, the stronger the light, the smaller the resistance. The resistance values of R1 and RP are set according to the value of RG under 1001x illumination. …
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