Line Driver is amplify Current in signal line. Because, current from IC is very low. If use current from IC for LED or Long line may be cause signal level is not correct logic ( logic "1" is different logic "0" with voltage level)
Today, we can make line driver very easy, by use IC line driver such as 7407 with load resistor but if want to drive more current should be transistor.
แก้ไขเมื่อ 20 ม.ค. 51 16:46:59