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Thread: Attn electronics gurus; home made circuits, radios, anything

  1. #1
    4.3L moderator
    Join Date
    Oct 2007
    Prescott, Az

    Attn electronics gurus; home made circuits, radios, anything

    Hey Guys, anyone here proficient at circuits? I am very amateur at this relm of techie projects and know just enough to either build something that won't work or to get myself into trouble.

    I am looking to build a project board that would adjust it's output voltage between 0v-5v in the name of maintaining a 2.5v input/reference.

    The output will be constantly variable between 1v-4v realistically but I'm going to say 0v-5v to be safe.

    I am trying to trick the cars computer into thinking it's seeing voltage from one sensor but instead it's reacting from another different sensor.

    I was thinking of using an Error Amplifier/Shunt Regulator such as the TL431 that has an internal 2.5v reference. I think it would accomplish what I need, but I hear that the lowest possible output voltage is the 2.5V...where I need the lowest to be 1-ish volt. Yet I'm not sure if people just say minimum is 2.5V because this circuit is mainly used to regulate line voltage and has the 2.5v internal reference.

    I also don't like that it's an on/off shunt regulator that is switching between 0v-5v sine wave in order to regulate voltage, would the use of a capacitor act as a dampener?

    I apologize for leaving out specific details, if my idea works I will share it with the world. Hell, if it doesn't work I'll still share it....once it's complete. If I include the details of my idea initially it will just be open to speculation instead of helpful feedback.

    Does anyone have any ideas? Thanks! -Mykk

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  3. #2
    Half Throttle
    Join Date
    May 2007
    Camden, MI
    more info is needed.... I'm not sure which sensor you're trying to emulate or for what purpose, but can you draw out what you know/want the waveforms for both input and output to look like?

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