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Thread: Know of a module that will honk horn when it recieves full voltage 14 and not 6 or 8?

  1. #1
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    Know of a module that will honk horn when it recieves full voltage 14 and not 6 or 8?

    I'm adding steering wheel controls to my car. The steering wheel that has the controls comes from a later model car, but they are interchangeable physically.

    The problem comes in the wiring of the radio controls and the horn.

    An aftermarket radio and a SWI-JACK takes care of the radio buttons controlling the radio.

    However, the horn runs on the same wire that the radio buttons run on. The horn runs +12 (full voltage 14.5) to the relay and the radio buttons (since they have resisters) run +4, +3.5 +5..etc depending on the button pressed. I don't know the exact values. I could also run the whole setup off of resistance instead of voltage if it helps or makes things easier.

    Does anyone know of a module that will either ground the coil side of my horn relay or supply power to the coil side of my horn relay when it receives +12 (full voltage 14.5) only and not when it receives some lower voltage? Or resistance? I would hate to have my horn beep when all I want is volume down.

  2. #2
    Vendor - Qube colin's Avatar
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    Use a comparator? Use a 12v zener? There's a few ways you could do this, you don't need a module, you need a voltage reference source and some creativity.

  3. #3
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by colin View Post
    Use a comparator? Use a 12v zener? There's a few ways you could do this, you don't need a module, you need a voltage reference source and some creativity.


    Comparator means one of those small protoboards have to be used to fit the IC, but the zener is just 1 device in series. Just remember to wire it backwards! Seriously...
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  4. #4
    Admin. Linux loser.
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    Bugbyte's Avatar
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    +1 for the xener.
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  5. #5
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    hmm.. I don't hardly know what those are or how to use them.

    Has someone put up any build it yourself circuit designs? I'm not quite good enough to know how to design and build any myself.

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