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本电路用专用芯片303组成,性能好,价格便宜。黄色的LED应放在光敏电阻LDR的1cm距离以内,1kΩ预置电位器V1来调整LED的亮度以匹配LRD所需的感光灵敏度。
The circuit with a dedicated chip 303 composition, good performance, cheap. The yellow LED should be placed within 1cm of the LDR of the photoresistor. The 1kΩ preset potentiometer V1 adjusts the brightness of the LED to match the sensitivity required by the LRD.