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The flashing switch circuit controlled by light intensity(th

2017-02-02 23:18  
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The flashing switch circuit controlled by light intensity(the lamp shining in the speed of 1.5KHZ)
In the light degree of 13 ~ 25lx, the lamp flashes in the frequency of 1.5Hz. The circuits work as a multivibrator. When the light intensity is over 25lx, the value of photosensitive resistor is low, transistor T2 turns on, lights off. The diode BA127stops the transistor T1. In order to make the multivibrator work in low illumination, it needs to connect a spinner resistor to thephotosensitive resistor in parallel to limit the increasingrate of theresistance of photosensitive. The main technical data: UB=4V, the light intensity is 45lx, it turns off; UB=5V, the light intensity is 25lx, it turns off; UB=6V, the light intensity is 15lx, it turns off; The voltage of the lamp: 2~4V The current consumption(100lx): <10mA The environment temperature: -10~+50℃