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This 6 digit clock display unit consisists of 6 common cathode 7 segment displays along with four LEDs to form two colons(:). For switching the digits, an ULN2003 Darlington pair IC has been used.
Address bus is used for selecting the digits and Data bus is used for selecting the segments.
For a better understanding, you are requested to follow the link of tutorial given in the 'Documents' section.