Light control principle circuit rooster crows

Circuit principle is shown in FIG apparatus. When the night light irradiation on the photosensitive resistor RG, RG of great resistance, (much larger than 50K), so the LSE O, f

eet equivalent open, LSEs pin output low, transistor VT1 conduction, excitation relay J pull its normally closed contacts j oFF, chicken sounds analog circuit IC KD5609 does not work without power. Once dawn, light irradiated on the RG, RG internal resistance becomes smaller ( 50K), this time the LSE pin output high, the transistor VT1 end, the relay J release, closes its contact j, analog sounds of chickens circuit energized work, accompanied by realistic sounds of chickens from the indicator in the speaker BL.

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