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Eye-care Lamps (the 2nd)

2016-08-05 17:35  
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Eye-care Lamps (the 2nd)
Work of the circuit The circuit consists of power circuit, timer, light examine circuit, LED shining circuit, light control circuit and music circuit (It is showed in picture 9-69.). Turn on the power and the timer begins to work. Lamp EL is lightened but either music circuit or HA works. When the regular time is over EL stops working and HA sends out music to remind the user to have a rest. Change the value of RP to change the sensitivity of light-dependent control.