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ATOM Diy module

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

  1. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

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  2. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

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    Use a longer screw. The "heat sink" aluminum would have a clearance hole for the size as the screw. The screw could be longer if need be.
     
  3. tysman

    tysman Member

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    K thanks
     
  4. dave

    Dave New Member

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  5. tysman

    tysman Member

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    i used an ST901T in one of my modules works great lots of rpm in my chainsaw :) so as an alternative it will work in place of D1071
     
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  6. debe

    debe Active Member

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    Thanks for that feed back on a successful replacement transistor.
     
  7. tysman

    tysman Member

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    yup specs on it to says made for ignition systems like chainsaws, lawnmowers, etc. says its rugged to
     
  8. tysman

    tysman Member

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    Made a module for a buddies saw and for some reason had to switch wires around do I leave the spike protector the same or do I flip it to. Also noticed that it reads a resistance of 3.10 both ways normally diode should only read 1 way.
     
  9. tysman

    tysman Member

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    also spark on module is weaker then points which seems weird
     
  10. debe

    debe Active Member

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    You have a problem some where. The diode out of circuit should read about 20 ohms one way & infinity the other. As an assembled unit mine read 20 ohms one way & 90 ohms the other way.
     
  11. tysman

    tysman Member

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    when i hooked module up to saw there was a faint spark when i hooked gnd up did i damage module? and thats why spark is weak and weird readings on diode? the saw runs with wires switched seems like no top end but i do have wrong plug in engine which makes difference
     
  12. tysman

    tysman Member

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    also im using a DPDT switch so can switch from points to module with switch 1 way module is in use and points disconnected and with switch other way then points in use and module disconnected the coil is middle pin on switch. if i damaged something on module to make spark weaker what should i change or check on module?
     
    Last edited: Sep 21, 2017
  13. tysman

    tysman Member

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    Looks like everything is fine soldered new transistors in same outcome um so for some reason wants to run with wires switched do I leave the diode alone or switch it to? Also the points side is still stronger more rpm then module. I'm thinking timing related this flywheel has tighter gap on magnets
     
    Last edited: Sep 21, 2017
  14. debe

    debe Active Member

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    Have you wired the spike protector to the module around the wrong way? Perhaps post pictures of your module.
     
  15. tysman

    tysman Member

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    Spike protector is same way as your diagram I just switched wires. Timing seems off no top end
     
  16. tysman

    tysman Member

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    Any sorta timing adjust with resistors to make spark hotter or increase in rpm?
     
  17. debe

    debe Active Member

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    Not that I know off. But some pictures of your module & the chainsaw flywheel & Coil might be of some help.
     
  18. tysman

    tysman Member

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    OK I will take pic of flywheel and coil.
     
  19. tysman

    tysman Member

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    Here's flywheel

    [​IMG]
     
    Last edited: Sep 22, 2017
  20. tysman

    tysman Member

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    those Nova Modules i dont think have timing resistors what would happen if it was just the switching transistor and the bc337. i have a pic of a blue coil taken apart and those 2 components where only thing inside no caps or resistors
     
  21. tysman

    tysman Member

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    cause gap in flywheel is slightly tighter i think i need to retard timing by a little is this correct?
     

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