Light intensity control switch circuit

Published:2011/4/24 10:06:00 Author:Christina | Keyword: Light intensity, control switch | From:SeekIC

When the light intensity is 10-25lx, The bulb's frequency of flashing is 1.5Hz. At this point this circuit works as the multivibrator. When the light intensity is over 25lx, resistance of the photosensitive resistor become lower, transistor T2 turns on, the light turns off. The circuit close the transistor T1 by diode BA127. To let the multivibrator work under small illumination, we must parallel a fine-tuning resistance at both ends of the photoresistor to limit the resistance increase rate. Main technical data: The light intensity and voltage when the circuit shut down: when UB=4V, light intensity is 45lx when UB=5V, light intensity is 25lx when UB=6V, light intensity is 15lx Lamp voltage: 2V to 4V Current consumption (100lx): <10mA



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