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Transistor Ignition shematic

Discussion in 'General Electronics Chat' started by easy.rahil, Jul 17, 2011.

  1. easy.rahil

    easy.rahil Member

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    Transistor Ignition schematic

    Hello All Experts, i m in need of Transistor Ignition to replace point breaker from my motorcycle. i read many many articles in internet google and almost all forums but did not yet found working and simples smallest circuit yet. and which i found they dont have answers about parts of any other related question and most of thm copid and old and parts hardly available in market.
    one i found recently in an another forum is seems good and using hall senser but thread owner do not reply and not giving parts list and schematic.
    here it is the pic:
    [​IMG]

    if anybody can help making this or magnetic trigger schematic, will be appreciated.
    Thanks
    Last edited: Jul 18, 2011
  2. Electronworks

    Electronworks New Member

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    The small transistor like packages are probably the Hall Effect sensors from someone like Honeywell (SS466A?). It looks like these are used to pick up the magnetic field of a rotating magnet (that cylindrical silver thing) and are used to drive the big TO220 transistors (cannot see the part number). The other packages are diodes and resistors. Unfortunately I cannot give you any more circuit detail than that
  3. easy.rahil

    easy.rahil Member

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    thanks for reply.
    you are right it is of hall sensor TCi module. and ofcourse it is very small and compact too. with static timing.
    May be someone else can give design with parts info so i can make it complete and test.
  4. Jaguarjoe

    Jaguarjoe Member

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    Somewhere out in "internetland" there is a simple circuit for a transistorized ignition that used one PNP power transistor. It still used breaker points, but it would be very simple to adapt the base input to work with a Hall sensor or the like. I'm sorry I never saved the web address, but its out there. If I could find it, anyone can. I bought all of the parts to build it along with a small box to house it. I sold the bike and moved and I don't know if I saved any of that stuff or not. If I can find it you can have it for a very low price.
  5. easy.rahil

    easy.rahil Member

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    O thats very nice if it ll be possible. i will find simple circuit with minimum components if it is possible that we can remove contact breaker in transistor ignition. there are some available on net with contact breaker for pulse.
  6. shortbus=

    shortbus= Active Member

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    Here is a link to an easy way to do it if you still have points. The points don't carry any real load, they just trigger the module, so points will last forever.

    http://home.comcast.net/~loudgpz/GPZweb/Ignition/GPZheiModForPoints.html
  7. debe

    debe Member

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    Is it a magneto type ignition? (Coil & points under flywheel) if it is I have a circuit to replace the points in this type of ignition.
  8. easy.rahil

    easy.rahil Member

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    Dear Debe, yes it is the same you are saying. you may share the design/components w ith us. hope it will help me to replace points.
  9. debe

    debe Member

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    Hi rahil, here is the circuit & pictures of a copy of an Ign module that used to be avalable but nolonger produced. To fit it you remove the Ign points & condencer & fit this module in its place. The original units were called ATOM ign modules. They are easily built & work well on the engines ihave fitted them to.

    Attached Files:

  10. debe

    debe Member

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    Forgot pic of a finished unit.

    Attached Files:

  11. easy.rahil

    easy.rahil Member

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    Dear Debe, Thanks for your post, it is really informative and wonderful. i have few question regarding this schematic aas i m dumb at electronics. i will use pulse trigger for triggering. where to connect the input of signal? the schematic you attached has no input point for signal also need which point is Negative side and what is positive side of wires/connections.
    one thing is sure that it is so compact and will give it a try as parts are cheap here in India.
    i m online in yahoo and google too if possible you to chat with me. ( rahil.smart at gmail and easy_rahil at yah00 )
  12. debe

    debe Member

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    The Ign coil trigers the module, PW is the primary winding of the Ign coil. the lower part of the circuit is Gnd & the upper part is where the Points were conected. Picture of the original Module instructions. When mounting Q1 to aluminum heat sink it must be insulated.

    Attached Files:

    Last edited: Jul 18, 2011
  13. easy.rahil

    easy.rahil Member

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    dear Debe, thanks for your update. it is instructions material. i m in need of wire connection in schematic. and negative positive reference please.
  14. debe

    debe Member

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    The electronics doesnt get any simpler than this, sugest you find a freind who can assemble it for you. Its nearly midnight here im of to bed.
  15. alec_t

    alec_t Well-Known Member Most Helpful Member

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    I have issues with the following, in the schematic :-
    1) The BD649 is shorting the coil primary
    2) The +ve and -ve supply connection points should be specified
    3) The trigger input (R2?) is shorted to the coil primary
  16. easy.rahil

    easy.rahil Member

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    Dear Alek, your questions are perfect and i m also waiting to solve this schematic. i test this online and it says it has 2 bad connections. it will be nice if we know exact connection input and outputs.
  17. debe

    debe Member

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    Computer simulation programs arent proof that a circuit will work. This circuit definitely works & i have built several of them. If you want a full explination of how it works Google US Patents 4,163,437 Aug.7, 1979. There are 30 pages on how the circuit works & the circuit but there is no values shown, that part I had to work out. (ATOM Ign module)
    Last edited: Jul 19, 2011
  18. debe

    debe Member

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    Some pics of a unit before seting in resin.

    Attached Files:

  19. easy.rahil

    easy.rahil Member

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    Dear Debe, I believe that you have done this job already as i can see homemade product made by you. i have a question...every system take pulse for trigger and which point take pulse in this schematic? as this module has only two wires as output or input. we can say that we need three points as:
    1=Input trigger
    2=output for HT coil
    3=Ground
    so please let me know which one is what. it will be easy for me to built.
  20. debe

    debe Member

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    There is only 2 conections, the Colector of Q1 goes to the coil conection that the points went to. The Emitter of Q1 goes to Ground. In the above picture the Brown wire goes to coil primary that went to the points. The Blue wire goes to Ground.

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