rajkot

Monday, February 15, 2010

DIGITAL STOP WATCH


  1. A digital stop watch built around timer IC LM555 and 4-digit counter IC MM74C926 with multiplexed 7-segment LED display.
  2. MM74C926 consists of a 4-digit counter, an internal output latch, npn output sourcing drivers for common cathode,
    7-segment display and an internal multiplexing circuitry with four multiplexing outputs.The counter advances on negative edge of the clock.
  3. First, reset the circuit by pressing S3 so that the display shows ‘0000.’

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