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Auto-dimming lamp

2016-08-06 23:52  
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Auto-dimming lamp
The auto-dimming lamp circuit is composed of the power supply circuit and light control circuit, and it is shown in Figure 3-201. Power supply circuit is composed of the power switch S, filter capacitors Cl, C2, inductor L, bridge rectifier UR, current limiting resistor Rl and the voltage regulator diode VS. Light control circuit is composed of the photosensitive resistor RG, resistor R4, potentiometer RP, capacitor C3, transistor V1, two-way trigger diode V2 and thyristor VT. Rl selects the 1/2W metal film resistor; R2-R4 use the 1/4W carbon film resistors or metal film resistors. RP uses the solid organic or synthetic membrane potentiometer.