To display time in railway stations which digital circuit is used?
2023
To display time in railway stations which digital circuit is used?
- A.
Seven-segment decoder
- B.
Eight-segment encoder
- C.
8 : 3 multiplexer
- D.
More than one of the above
- E.
None of the above
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Correct answer: A
Digital clocks in railway stations use Seven-Segment Displays to show numerical digits (0–9). To bridge the gap between the internal binary data of the clock and the visual display, a decoder is required.
Input: The circuit typically takes a 4-bit BCD (Binary Coded Decimal) input representing a number.
Output: The decoder translates that BCD input into seven individual signals. Each signal controls one of the seven LEDs (labeled a through g) arranged in a figure-eight pattern.
Result: By lighting up specific combinations of these segments, the display forms readable numbers for travelers.