Light sensing circuit diagram

  
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In the silicon-controlled trigger circuit, cadmium sulfide cell connects the relaxation oscillator before having a sensor to blink in darkroom. That make the speaker emit the warning sound of Ka, Li. The rate of the sound will increase with the quantity of light. When there is no blink, to modulate R2 until it`s lower than the limiting value of sound. The..
Light sensing circuit diagram - schematic




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