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Light sensing circuit diagram

2014-11-28 23:20  
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Light sensing circuit diagram
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 circuitry is applied in fire warning system, and it uses the cadmium selenylation cell to replace PC1, as cadmium sulfide cell is more sensitive to infrared rays; when it's applied in temperature warning system, the optical spectrum expands to far infrared region, plumbum sulfide cell is applied in the circuitry as it is more sensitive to infrared rays.