ATO Kundo Adding circuit board to Kundo ATO

Discussion in 'Electric Horology' started by rudiedog, Jan 7, 2018.

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  1. rudiedog

    rudiedog Registered User

    Nov 12, 2013
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    OK, forgive me, electronics is not my thing....at all. I have one of the Kundos with a transistor that has given out. I see someone on E-bay is selling brand new circuit boards for these clock that had them. Could I just add one to my clock? Wouldn't the circuit board do what the Germanium transistor did?
     
  2. etmb61

    etmb61 Registered User
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    You may still need to change or rewind the coil as well. That being said, I have not seen the circuit diagram for the clocks with the external board.
     
  3. praezis

    praezis Registered User

    Feb 11, 2008
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    I doubt that this.circuit will work in your clock. It needs access to both ends of one coil without a (broken) transistor in between.

    Frank
     
  4. rudiedog

    rudiedog Registered User

    Nov 12, 2013
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    Bummer!!! This would have been such a Godsend to many of us with end of life clocks. Well, I guess it is back to the work-around in the video posted in another post.
     
  5. David S

    David S Registered User
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    Dec 18, 2011
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    Hi guys I have some germanium transistors in TO-5 cases. Anything special? Certainly would be willing to part with some if they can help.

    PNP or NPN?

    David
     
  6. MartinM

    MartinM Registered User

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    There are folks who've tested and found that steel cased versions cause problems. I don't know if anyone ever said anything about aluminum.
    The original clocks used a glass S02 case.
     
  7. jcosta-co

    jcosta-co Registered User

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    #7 jcosta-co, Jan 26, 2018
    Last edited: Jan 26, 2018
    I have collected a number of circuit diagrams for the Kundo electric clocks over the past few years. Here are some I have found.

    Regards,
    John

    upload_2018-1-25_23-44-21.png
    The values of the electronic parts are from my Kundo clock,
    the values in brackets are from the German patent 1.773.306A

    upload_2018-1-25_23-45-43.png
    German patent 1.178.015
    US patent No. 3.118.098



    upload_2018-1-25_23-48-33.png
    Kundo Tapped Coil
    2,000 & 600 Ohms





    upload_2018-1-25_23-50-6.png
    Kundo Drive Circuit by Ron Elliot
    Sensor coil – 5,000 turns, #42
    Drive coil – 3,000 turns, #42
    Silicon transistor


    upload_2018-1-25_23-52-48.png

    upload_2018-1-25_23-58-12.png
    PNP BC258B silicon
    NPN BC168B silicon
    This circuit is not mine. It's from Rod Elliott's website.
    It can be found here.... http://sound.westhost.com/clocks/motors.htm
    PNP (Si) transistor: 2N3702 (TO92)
    MMBT4126 (SOT23)
    NPN (Si) Transistor: 2N5172 (TO92)
    MMBT5089 (SOT23)

    upload_2018-1-25_23-48-3.png upload_2018-1-25_23-57-32.png
     
    David S likes this.
  8. David S

    David S Registered User
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    Dec 18, 2011
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    John very nice summary of various electronic clock circuits. I think this post deserves its own thread and title for easy future searching.

    David
     

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