psy336699 发表于 2014-5-25 21:07:18

有哪位高手知道室内单元板上74HC04门旁边的那两个IN4148的作用是什么?

有哪位高手知道室内单元板上74HC04门旁边的那两个IN4148的作用是什么?http://image.baidu.com/i?ct=503316480&z=&tn=baiduimagedetail&ipn=d&word=IN4148&step_word=&ie=utf-8&in=5842&cl=2&lm=-1&st=&pn=29&rn=1&di=66711443370&ln=1303&fr=&&fmq=1401022894765_R&ic=&s=&se=&sme=0&tab=&width=&height=&face=&is=&istype=&ist=&jit=&objurl=http%3A%2F%2Fpdt.static.globalsources.com.cn%2FIMAGES%2FPDT%2FSMALL%2F911%2FS5018310911.jpg#pn29&-1&di66711443370&objURLhttp%3A%2F%2Fpdt.static.globalsources.com.cn%2FIMAGES%2FPDT%2FSMALL%2F911%2FS5018310911.jpg&fromURLippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3B2s5kwsf576vjf_z%26e3Bv54_z%26e3BvgAzdH3F2f5sAzdH3FIAzdH3FLL989b-8N989b-IN989b-%25CC%25Fl%25Cm%25AC%25Bm%25FE%25BC%25AB%25Bl%25DC-%25A8%25BE%25Cb%25Cb%25Cd%25F9%25A8%25BFAzdH3FrAzdH3Ff4AzdH3Fca8bn8al88_z%26e3Bip4&W180&H180&T8560&S8&TPjpg

笑问天 发表于 2014-5-26 08:54:10

和04组成了防停扫电路。见与16扫单元板。防止行扫一旦停止对4953造成烧损
页: [1]
查看完整版本: 有哪位高手知道室内单元板上74HC04门旁边的那两个IN4148的作用是什么?