12vdc to 5vdc @ 40-60hz

Discussion in 'General Electronics Chat' started by twotonetommy22, Jun 2, 2014.

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  1. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    I can get 5vdc from my 12vdc source but, how can I achieve around 50hz on my 5vdc line?
     
  2. BobTPH

    Active Member

    Jun 5, 2013
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    It would not be DC if it has a frequency. Are you trying to create 5VAC?

    Bob
     
  3. #12

    Expert

    Nov 30, 2010
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    Use a signal generator or build an oscillator.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    You want 50Hz on a DC circuit?
    Xtal Oscillator.
    What are you using it for/with?
    Max.
     
  5. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    I'm working on my car and there is a module that has an output line of 5vdc. In the diagnostic steps it asks me to check that 5v wire for voltage which is dc then, to check for frequency which should be between 40-60hz. The module is not oscillating the voltage so, I want to build my own circuit instead of spending $700 for the module.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Take a trip to a local wrecker.
    Max.
     
  7. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    These modules are prone to failure so i'm trying to eliminate it. Also if I replace the module, I have to have it flashed to the vehicle.

    Where can I find this xtal oscillator? I don't believe radio shack would have one
     
  8. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    [​IMG]

    Would this work?
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Xtal (Crystal) , you build your own with discrete components, Google should bring up plenty.
    Max.
     
  10. alfacliff

    Well-Known Member

    Dec 13, 2013
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    Havnt seen many 50 hz crystals, might have to use one a little higher and devide it down.
    also, the 50 hz probably isnt the purpose of the module, but one of the outputs coresponding to something coming in, like a "the ignition is still running" output/.
     
  11. MaxHeadRoom

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  12. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    The 5v is for the key on and the 40-60hz pulse is the signal for the computer to turn on the injectors. Thanks for all the help. I'll post the outcome in a few days
     
  13. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    wow that is awesome! What would the output voltage be for that setup?
     
  14. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    I see the 7805 regulator in there but just want to make sure the output line is at 5v.
     
  15. alfacliff

    Well-Known Member

    Dec 13, 2013
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    that circuit would not work very well, it is a fixed 50 hz pulse generator, and you need variable timing for the injectors.
    thats why the module is so expencive, its the ignition / injector computer. thats why it needs "flashed" when put in, to program it for your viehicle.
     
  16. twotonetommy22

    Thread Starter New Member

    Jun 2, 2014
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    I am bypassing my VATS module on a GM. The main brain uses the 50hz as an anti theft purpose. The 50hz is generated by the VATS when the key is turned on. The main brain then knows it's okay to turn on the injectors.
     
  17. Georacer

    Moderator

    Nov 25, 2009
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