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automotive electrical noise detector

Discussion in 'Electronic Design' started by PDRUNEN, Jan 19, 2005.

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  1. PDRUNEN

    PDRUNEN Guest

    Hi Group,

    I am working on a project which will detect if a automobile is running. The
    output of sensor would be a TTL high for running and a TTL low for not running.
    The circuit will be inside the car, most likely in the glove compartment or
    storage compartment. It will not be connected to the automobile and run off of
    batteries.

    My thoughts are to use a common 455KHz IF filter and amplitude detect or a 10.7
    MHz IF filter and do the same.

    Which frequency would be better and/or easier to design around? (455KHz or
    10.7MHz). How about VHF or a super-reg with a wide bandwidth?

    How much gain would a stage following an IF filter require such that it could
    be used as a level detect?

    Other suggestions? (I want to stay away from any connections into the car).

    Paul
     
  2. Paul Burke

    Paul Burke Guest

    Turn the music off and listen? Change from a Rolls to a banger? Hang a
    small bell in the engine compartment? Look at the oil pressure light?

    Paul Burke
     
  3. John G

    John G Guest

    Wot's youre real objective?

    Most cars have enough Idiot lights to tell you they are turned on and
    running or not.
     
  4. Robert Baer

    Robert Baer Guest

    How about a solid state air flow detector (vane) in the tail pipe, or
    is that too complex?
     
  5. mike

    mike Guest

    ONce had a boat tachometer that had a tunned diode receiver that ran on
    ignition noise.
    mike

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  6. mike

    mike Guest

    Make that TUNNEL DIODE


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    Wanted, PCMCIA SCSI Card for HP m820 CDRW.
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