need a simple digital clock circuit

Discussion in 'The Projects Forum' started by Major Aspsial Asadullah, Nov 22, 2007.

  1. Major Aspsial Asadullah

    Thread Starter New Member

    Nov 22, 2007
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    hi,
    I am new in electronics i m doing BS Tele communication engineering i want to construct a simple digital clock I want your help
    Suggestions are welcomed
     
  2. mrmeval

    Distinguished Member

    Jun 30, 2006
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  3. cumesoftware

    Senior Member

    Apr 27, 2007
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    I remember that there was one chip with almost all the circuitry needed for a digital clock. Only the LCD/LED display, the buttons and the PSU (of course) were to be added. But I don't remember the reference.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    Got one on an old clock. Of course, General Instruments is no longer in business.
     
  5. Voltboy

    Active Member

    Jan 10, 2007
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    You could try with the LM8562 - Digital Alarm Clock. It also contains an 7 segment display output and alarm.
    Edit:I did a search and didn't found a supplier for the LM8562, but you could try with the DS1302 from Maxim IC's.
     
  6. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
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    check this out http://transistor.20m.com/clock.html

    if your not keen on micros maybe you can try several chips like;

    7400 - TTL quad nand
    7473 - TTL JK Flip Flop
    7447 - TTL BCD 7 segment Decoder/Driver
    7413 - TTL Dual 4 input Schmitt Trigger (if you could still find one)
    7490 - TTL Decade & Binary Counters

    however this functions in a 24 hr. mode
     
  7. Major Aspsial Asadullah

    Thread Starter New Member

    Nov 22, 2007
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    Great thanks to all who helped me
    i m very thankful all of you
     
  8. Papabravo

    Expert

    Feb 24, 2006
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    Well...isn't that the company that calls itself Microchip? Seems to me the original PIC 16C54 was a General Instrument part.
     
  9. beenthere

    Retired Moderator

    Apr 20, 2004
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    That may be, but the chip was the first LSI ic. It was in a Heathkit digital alarm clock that also used Sperry-Rand displays that were a neon seven segment equivalent of a Nixie tube. After 35 years, it may be hard to find.
     
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