Simple infrared ray control lighting switch circuit

Published:2011/7/25 20:20:00 Author:Christina | Keyword: Simple, infrared ray, control, lighting switch | From:SeekIC

When you connect the power supply, the infrared emitting diode d6 sends out the infrared ray, and the phototransistor q1's c-e pole is in the low resistance state under the infrared light irradiation, and the q2's base electrode b is in the high level state, q2 conducts. Then q3 and q4 conduct. q5's base electrode b has the low level and is in the cut-off state because the q4 is conducted, the relay will not operate. When the person or object cuts off the infrared beam of d6, the q1's c-e pole is in the high level state, then q2, q3, q4 cut off, q5 conducts, the relay operates to turn on the light.



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