Traditional Chinese Practical Eye protection (2): Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Eye protection (2). 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 4160 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Vision Protectors(2)The intensity of light has a great impact on people's vision, especially when the lights are suddenly turned on and off. Due to the persistence of vision, it cannot adapt to the sudden changes in lighting, causing damage to vision.The vision protector can make the bulb gradually brighten automatically when the light is turned on, the illumination gradually increases, and the gradient time can be adjusted arbitrarily within 15 seconds. When turning off the light, the bulb can gradually dim and the illumination gradually weaken, and can be adjusted arbitrarily within 30 seconds to 15 seconds. Eye protectors are ideal for theaters, reading rooms and home use.The principle of the vision protector is shown in Figure 161, which consists of a relaxation oscillator and an electronic controller. The single-junction transistor VT1 (BT33) and R2, R3, R4, R5, VT2, C1, etc. form a relaxation oscillator, and a spike pulse is output from R3 to trigger the thyristor VS1. As long as the oscillation frequency is continuously changed, the conduction angle of the thyristor can be controlled to achieve the purpose of slowly adjusting the brightness of the bulb.When the band switch S1 is moved to position 1, the power is turned on. When switch S2 is closed, the current charges C2 through VD6 and RP3, causing the base potential of VT2 to gradually increase. …
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