This 4 -digit 7-segment display section is wired around four common-cathode 7-segment LED displays, and four BC547 npn transistors. The 1K resistors are used for base current limiting, and the 390R ...

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Even so, fitting a two-digit display seemed difficult. We used a Charlieplexed display to arrange the LEDs in the required two-digit, seven-segment format, which would serve our purpose ( Fig. 2 ...