The displayor using a 7 segment display in electronic device applications is drain port of a microcontroller or data that would point in the show, especially when the data would 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.
Series Display 7 Segment 4 Digit Multiplex is a way to save the port or microcontroller 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.
Image Series Display 7 Segment 4 Digit Multiplex
Configuration circuit components 7 Segment 4 Digit Display Multiplex
The legs LT, RBI, RBO in this circuit is not connected (logic high) is meant to display data from the seven segment according to data from the microcontroller. Resistors are mounted a 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.