Noob Needs Help: Momentary to Toggle, With a catch...

Discussion in 'General Electronics Chat' started by R32Jake, Apr 8, 2010.

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  1. R32Jake

    Thread Starter New Member

    Apr 8, 2010
    Hi guys,

    I need some help with an automotive project. i will try to describe the scenario without boring you with the details. I have a circuit in my vehicle that controls the exhaust muffler bypass that I would like to manually control. But rather than mounting another switch in the dash, I would like to integrate it into the function of the traction control switch (momentary); so that when I turn the traction control system off, it will also "Open" the exhaust circuit.

    So here is what I need help on: I would like to use the momentary signal from the existing switch to control this independent exhaust circuit, which should be Normally Closed. So i am assuming I will need some sort of a flip-flop circuit.

    But here's the catch: Anytime the ignition is turned off, the traction control system is turned back on. So i need to somehow integrate the ignition power-source into the switching mechanism. Otherwise if I have the exhaust open and turn off the ignition, the next time I start the car, the exhaust will still be open, but the traction-control will be back on.

    Let me know if I can clarify that better, I know it is confusing. Thanks in advance for any help!

  2. SgtWookie


    Jul 17, 2007
    I'm sorry, but the AAC policy prohibits discussion of projects that may cause personal injury or property damage.

    A decision was recently made by the staff that ALL automotive-type projects fall into this category.

    As such, we cannot help you with your project.

    Our only advice is to have your vehicle's electrical system professionally maintained exactly the way it was when delivered by the dealer. If you fail to do so, your vehicle may not be safe, and your insurance company may not pay for damages if an accident/fire occurs and they were not notified beforehand of your modifications.
    Last edited: Apr 8, 2010
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    Sorry to say that is the way it must be.
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