This is a four-digit alarm clock based on the Mostek MM5316 clock chip.

The clock uses four individual vacuum flourescent display tubes to show the time. It is wired for 12-hour operation, with AM/PM being indicated by a flashing segment in the left-most tube.

The alarm sound comes from the small speaker located to the right of the display tubes.

Five push-button switches control the operation of the clock.

  • One switch displays the minutes and seconds (MM:SS) while pressed.
  • One switch controls Time Set and another switch controls Alarm Set.
  • Two switches advance the clock or alarm setting at a slow or fast rate.
  • A slide switch controls the operation of the alarm.


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Last updated October 28, 2006