Traditional Chinese Light-controlled automatic desk lamp (Workshop Practice) — Circuit, Wiring & Debug Guide
In short: Traditional Chinese Light-controlled automatic desk lamp (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 3091 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Light controlled automatic desk lampThe automatic dimming desk lamp can automatically adjust the amount of light emitted by the desk lamp according to the intensity of the surrounding environment. When the ambient illumination is weak, it emits light brightly; when the ambient illumination is strong, it emits light dimly.Circuit principle:The circuit of the light-controlled automatic desk lamp is shown in Figure 155-1. When the function switch S is moved to position 2, it is an ordinary dimming desk lamp. RP, C and neon bubble HD form a relaxation oscillator, which is used to generate pulses and trigger the thyristor VS. Generally, the glow conduction voltage of neon bulbs is 60~80V. When C is charged to the glow voltage, VS is triggered to conduct. Adjusting RP can change the C charging rate, thereby changing the VS conduction angle to achieve dimming purposes. R2 and R3 form a voltage divider, which also charges C through VD5. Changing the voltage divider of R3 and R2 can also change the conduction angle of VS, causing the brightness of the lamp to change. alt="222.jpg (29761 bytes)">Figure 155-1When S is turned to position 1 (that is, the position shown in the figure), the photoresistor RG replaces the R3 position. When the surrounding light is weak, RG shows high resistance, the potential at the right end of VD5 increases, the charging rate of the capacitor C accelerates, the oscillation frequency becomes higher, the VS conduction angle increases, the voltage at both ends of the lamp becomes higher, and the brightness increases. When the ambient light increases, the RG resistance becomes smaller. Contrary to the above, the voltage across the lamp becomes lower and the brightness decreases. VS chooses 2N6565.Component selection and production:VD1~VD5 can all use 1N4004 rectifier diodes. VS is 2N6565 (0.8A/400V) small plastic one-way thyristor. HD is NH-416 type neon bulb (CL11-400V type polyester capacitor can be used); RG is MG45 type photoresistor. There are no special requirements for resistive components.Figure 155-2 is the printed circuit board diagram of this circuit. The printed circuit board size is 50×30 (mm2). …
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Lei Cheng
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