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Christmas fancy Lantern Circuit Of Photo-coupler

2014-11-29 07:29  
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Christmas fancy Lantern Circuit Of Photo-coupler
Christmas fancy Lantern Circuit Of Photo-coupler
As shown in figure is an attractive Christmas fancy lantern.When the power source is available,lantern HL will brighten gradually;and it will darken automatically when it reaches the brightest level.This process is smooth.The luminance fluctuation of lantern HL depends on the charging and discharge of capacitor C3.When the output of IC1's 3 feet is high-level,capacitor C3 will discharge.And the luminance of lantern HL will decrease through photoelectric isolation of IC2(CN25).IC1 here acts as a astable oscillator,and its frequency is made by R1、R2 and C1.