future_dream_eg
Newbie level 1
i'm trying to build circuit to monitor many phone lines 8-10 line (when busy-holding-ringing...) and display busy lines on lcd
using pic microcontroller
i face problem with voltages to deal with 48-50 v dc which is normal voltage for phone line and 88 v AC which is for ringing with pic microcontroller
there are leds turn green when line busy and flash when ring ,red when line free(no call)
using pic microcontroller
i face problem with voltages to deal with 48-50 v dc which is normal voltage for phone line and 88 v AC which is for ringing with pic microcontroller
there are leds turn green when line busy and flash when ring ,red when line free(no call)