Seven segment 4 Digit display Multiplex in electronic device applications is drain port a micro controller or data point that will be on display, especially if the data to be displayed more than 1 digit. necessary path to control the resources of each 7 segment and the path to input data on the 7 segment. Circuit 7 Segment 4 Digit Multiplex is a way to save the port or micro controller data path that will be displayed. Series Display 7 Segment 4 Digit Multiplex uses BCD to 7 segment decoder 74LS247 BCD to encode data from the data that will be displayed, then for each resource viewer 7 segment using the set of transistors as electronic switches. Current flowing in the viewer in a series of 7 segment Display 7 Segment 4 Digit Multiplex is in limiting use yag resistor in series pairs in each collector transistor.
Resistors are mounted in series of LED is used as a barrier for current flow that flows through the LED does not exceed the maximum allowable, current that is equal to 20 mA.