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ATOM Diy module

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by debe, Oct 13, 2014.

  1. tysman

    tysman Member

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    i took apart a blue electronic coil only to find 2 components a 1479c transistor and a 203yy SCR i dont see any resistors
     
  2. tysman

    tysman Member

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    found the d1071 on ebay, is the mosorb to protect the module which makes it better then the nova which burnt out sometimes?
     
    Last edited: Mar 17, 2017
  3. debe

    debe Active Member

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    Yes the Mosorb is to protect the module. Heres whats in the blue Atom module ATOM BLUE.3.JPG ATOM BLUE.4.JPG ATOM BLUE.5.JPG ATOM BLUE.7.JPG
     
  4. dave

    Dave New Member

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  5. tysman

    tysman Member

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    ok :) i wonder whats in the yellow module. it seems to not do much more then the brown
     
  6. Little Ghostman

    Little Ghostman Well-Known Member Most Helpful Member

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    Fantastic, just like the old ETO bodger posts! I hate the buy it for $1 on ebay stuff, I like the take it it apart and copy stuff :D. I have also saved this for the future........
     
  7. tysman

    tysman Member

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    what colour module would I use for lawnmowers, rotor tillers like Briggs?
     
  8. debe

    debe Active Member

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    The listing gives a Green module for Brigs engines.
     
  9. debe

    debe Active Member

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    This is a picture of a Green Atom ignition module used on Brigs engines. They are not my pictures & the person I got them from did not check any values. But the construction & transistors are the same as a Red module. Personaly I would build the Red module & just try it on a Brigs engine. Atom. GREEN MODULE.jpg AtomTransistor. GREEN..jpg
     
  10. tysman

    tysman Member

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    ok thanks, I wonder whats in the original transistors of the ATOM and Nova? they don't seems to burn out after few minutes wonder how they can handle the spikes
     
  11. debe

    debe Active Member

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    The transistor is marked A3 & has a Texas instruments symbol on it. So it was probably custom made & there order would have been in the thousands at the time. It has taken me several years to find a suitable transistor. Some of the criteria was suitable Gain, Current & voltage rating & it had to be a Darlington transistor. The MOSORB was added as a Wipac coil on Seagull outboards was very destructive to these modules & the Transistor.
     
  12. Little Ghostman

    Little Ghostman Well-Known Member Most Helpful Member

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    You wouldnt think it was so hard to do! You have done well to find replacements, I have a very old outboard on my little boat (Honda 75 engine). I might go take a look at it, although it needs alot of work before it sees water again!

    Once I have a driving license I might have an incentive to get the boat finished :D.
     
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  13. dr pepper

    dr pepper Well-Known Member

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    British seagull, a blast from the past, was it the 40+ that had a brass fuel tank and villiers carb.
    The coupling between the lt and ht side of the coil was probably poor, causing high voltage Rf.
     
  14. debe

    debe Active Member

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    I have several Seagulls, This is a pic of the Modified 40+ with a Wipac ign used for bench testing of modules before seting them in resin. I use an electric drill to drive it. Also a module temporay fixed to a 5HP Tohatsu for sea trials. SEAGULL WIPAC.JPG TOHATSU 5HP & MODULE.JPG
     
  15. tysman

    tysman Member

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    Nice motor :) I have one more question and its about the bc337 on your module its hard to see how its soldered to the tranistor are all three soldered to each of pins of transistor? and which way does bc337 go?
     
  16. debe

    debe Active Member

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    The center lead of the bc337 is turned up on it self. T1.JPG T2.JPG T3.JPG
     
  17. tysman

    tysman Member

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    ok and the middle leg is soldered to resistors and other end of resistors go to either side of transistor? what connects to middle leg of transistor?
     
  18. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

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    Last edited: Mar 19, 2017
  19. debe

    debe Active Member

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    The ST901 is probably worth a try, I wont be as I have plenty of the 2SD1071 transistors. Hope the makes it simpler for you. T4.JPG
     
  20. tysman

    tysman Member

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    That's perfect thanks lot easier
     
  21. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

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