Light intensity control flashing switch circuit

Published:2011/4/24 7:49:00 Author:Nicole | Keyword: light intensity, flashing switch | From:SeekIC

When the light intensity is 10~25lx, the light is flashing with 1.5Hz frequency. At this time, the circuit works as multivibrator. When is light intensity is more than 25lx, the photosensitive resistance is minimum, transistor T2 turns on, the light off. The transistor T1 is cut off by conductive diode BA127. In order to make the multivibrator can work with low light intensity, it should parallel a trimmer resistor to the sides of photosensitive resistance, then to limit its resistance rate of rise. The main technical details: the light intensity and voltage when the circuit is off: UB=4V, light intensity 45lx turns off; UB=5V, light intensity 25lx turns off; UB=6V, light intensity 15lx turns off; bulb voltage: 2~4V; current consumption(100lx): <10mA; environmental temperature: -10~50℃.



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