cotton machine controlling photoelectric control circuit

Published:2011/6/4 4:14:00 Author:John | Keyword: cotton machine | From:SeekIC

When the phototransistor T1 is illuminated, low resistance shows. At this time, the electric potential of point A drops and 3AX31 conducts. The relay sucks to control the cotton machine. Capacitor of 200μF and resistor of 3 KΩ form the charging circuit, ensuring that electric potential of point A would not increase rapidly in the absence of light. The circuit plays the role of delaying and avoids the relay working too often. Resistor of 120Ω is the current feedback resistor, aiming to stabilize the operating point of 3AX31. 2CP2 is used to protect 3AX31.



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