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Digital circuit sound and light control stairs delay switch

2015-03-03 02:13  
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Digital circuit sound and light control stairs delay switch circuit ( 1 )
It has all the characteristics of the discrete components circuit, it also has high delay accuracy, high operational reliability and low the discrete nature performance between the various finished products, and therefore very suitable for factory mass production. The circuit has two characteristics: Firstly, the lamp operating time is the soft-start and half-wave AC after being lit, which can greatly extend the service life of the lamp; secondly, lamp lighting time is determined by the time constant of R10 and C5.