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Digital Alarm Clock RADIO

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by SERVITEC, Aug 30, 2008.

  1. SERVITEC

    SERVITEC New Member

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    Non-English post deleted - moderator
     
    Last edited by a moderator: Aug 31, 2008
  2. wmmullaney

    wmmullaney New Member

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    Please use english, even the translation is gibberish.
     
  3. Diver300

    Diver300 Well-Known Member

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  4. dave

    Dave New Member

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  5. mvs sarma

    mvs sarma Well-Known Member

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    If the language is Spanish, a rough translation appears like below-- courtesy altavista.
    "ke such colleagues of the forum my name is Dangelo and I have a problem with MY radio awakener happens that the time of the clock for atrazando about 3 or 5 minutes ke podria to be altering the operation of the awakener I have reviewed the interior of the apparatus and uses the SC8560.aceptare chip its advice to solve the problem. THANKS FOR ITS SUPPORT."

    You may have to indicate the frequency used in your country. is it per day 3 to 5 minutes - and even normal clock is drifting ?
    whether the transformer used is 4 wire secondary or 5 wires.

    perhaps more details are needed.
     
    Last edited: Aug 31, 2008
  6. audioguru

    audioguru Well-Known Member Most Helpful Member

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    I think the mains frequency drifts all over the place in some third-world countries.
     
  7. mvs sarma

    mvs sarma Well-Known Member

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    While that can't be helped, let us device a timebase, so that people who own such clocks can us them.I have tried to mod the sc8560 and perhaps need a wetting of the circuit to prevent errors. I seek your help.
    The schematic is attached. I tried to use MM5369with 3.579545MHz crystal deriving 60Hz time base, i need clock drive, displays 1&2 drives(perhaps complimentary)

    PS: original datasheet also attached for reference.The second schematic of the datasheet is under consideration.
     

    Attached Files:

    Last edited: Aug 31, 2008
  8. kchriste

    kchriste New Member Forum Supporter

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    It might make a good 8pin PIC project for someone as the MM5369 is getting hard to find. The 12F series chips such as the 12F629/675 or 12F683 with a crystal would make a good substitute for the MM5369. A PIC could supply either 50 or 60Hz with both phases, simplifying the circuit. You could sell pre-programmed PICs to others in India. ;)
     
    Last edited: Aug 31, 2008
  9. mvs sarma

    mvs sarma Well-Known Member

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    your proposal is of course fine. still we need the power drivers. It is for few interested persons and mostly we use Analog clocks with a single AA cell as it serves for an year. Such digital clocks with mains time base are never sold here as either a product or as a kit. Always kits include crystal based time base.
    Once the point of using PIC is accepted , we can make the entire clock with PIC16Fxx using the application note AN0615 of microchip and with suitable mod of the asm over there. I have two such clocks working with me. they operate on 2 AA cells. the display shut off feature can be disabled by a mod
     
  10. SERVITEC

    SERVITEC New Member

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    the frequency is of 60hz in my Peru country the transformer that enplea is of 3 cables in secondary the problem is: a pair of minutes only is late to the time that but decean to know thanks I see interest to solve this PROBLEM
     
  11. audioguru

    audioguru Well-Known Member Most Helpful Member

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    In Canada and the USA. Britain, Germany and many other civilized countries the mains frequency averages to be EXACT (within a few hundred parts per million) so that electric motor clocks and record players are correct.
     
  12. mvs sarma

    mvs sarma Well-Known Member

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    Let us not go on playing th same record . entire world know that you are better off. i feel , that we might confine to offering a possible solution to the issue under the present conditions, rather than pointing at those countries that you are poor or under.... you might agree with me
     
  13. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    At least your trains run to better time! :D
     
  14. on1aag

    on1aag New Member

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  15. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Maybe third word countries should complain about their ancient problems on theiir own website in their own 3rd world country.

    Clock radios are cheap and are made to use a very accurate mains frequency.
    If you want to use an obsolete crystal oscillator IC to make an accurate timebase then try it.
     
  16. mvs sarma

    mvs sarma Well-Known Member

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    Thanks for your understanding and co-operation please.
     

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