Practical Fully Automatic Switch Lamp: Traditional Chinese Circuit Des
In short: Traditional Chinese Practical Fully automatic switch lamp. 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 2479 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Fully automatic switch desk lampThis desk lamp that automatically switches on and off is made based on the circuit in Figure 154. When you sit at the desk and prepare to work, it emits soft light; when you leave the desk or lean back on the chair with your eyes closed, it automatically turns off.Circuit principle:After the power supply voltage is AC stepped down by R1 and C1, it is then rectified by VD1 and filtered by C2 to convert the 220 AC into a DC voltage of about 13V. After the voltage is current limited by R2 and stabilized by VD2, a stable DC voltage of about 8V is output, which is supplied to the transistor oscillation circuit and integrated circuit IC for operation. Transistor VT, coil L, capacitor C5, etc. form a high-frequency oscillator.When people are not close to it, the transistor oscillator generates radio frequency output, which is rectified by VD3 and filtered by C6 and added to both ends of R6. Point A is high potential, IC is reset, and terminal Q is low level. At this time, the triac VS has no trigger current and is turned off, and the bulb does not light up.When a person approaches it, the capacitance effect formed by the human body causes the transistor oscillator to stop vibrating. At this time, no voltage is applied to both ends of R6, the potential of point A is very low, and when VA is lower than the threshold level of the IC, the IC position and the Q terminal output a high level, causing the triac to obtain a trigger current and conduct, and the bulb emits light.Figure 154Component selection and production:Capacitors C1 and C3 should be made of polyester or metal film capacitors with a withstand voltage greater than 400V. The withstand voltage of diode VD1 should be greater than 400V, and the voltage regulator tube VD2 should be 2CW59 or 2CW57. Choose 5C1555 or NE555 as IC. The withstand voltage of the triac VS must be greater than 400V, and the current is 2A. The capacitor in the oscillator should be a ceramic capacitor. VT (3DG6) low power tube β≥70. L Use Φ1mm enameled wire to be densely wound around a Φ3mm mandrel for 6 turns to form an air-core coil. To ensure the reliability of the circuit, it is best to use metal film resistors for all resistors. The diode VD2 uses a 2CK type switching diode. …
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Lei Cheng
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