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Light-operated aquarium flashing light circuit diagram

2017-02-05 17:47  
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Light-operated aquarium flashing light circuit diagram
Transistors VT1, VT2 form the complementary self-excited multivibrator, and the oscillator feedback network is composed of the capacitor C. The base bias circuit of VT1 consists of resistor R and the photosensitive resistor RG. Indoor light is strong during the day, RG is exposed to strong light shows low resistance, VT1 base is in low level, VT1, VT2 are closed, light-emitting diode LED is not lit. At night, indoor light is weak, the photosensitive resistor RG is increased, VT1's base potential rises, when it rises to 0.65V, the oscillator starts to work, LED light will flash according to the oscillation frequency.