Eyesight Preserver (the 1st)

Published:2011/5/22 6:56:00 Author:Felicity | Keyword: Eyesight Preserver (the 1st) | From:SeekIC

Work of the circuit The circuit consists of light examining circuit, LED shining circuit and voice prompting circuit (It is showed in picture 9-59.). Turn on power switch S and battery GB supplies 3V voltage to the whole circuit. When the environment light is strong enough the voltage of VD is not so high. Here VL does not shine and HA makes no sound. When the environment light is dim the voltage of VD is high. Here VL shines and HA makes the sound “tick tick”.



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