Small Digital Volt/Ammeters

Discussion in 'Technical Corner' started by weirdjim, Nov 8, 2018.

  1. weirdjim

    weirdjim En-Route

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    These digital v/a meters are about $10 on Amazon and a bit less on ebay. The only problem with them is that the ammeter function splits the negative pole of the battery from the negative supply line to the load to insert the ammeter shunt. That's a problem in a metal structure (car, aircraft, aluminum outhouse...) in that the metal structure is usually a common negative bus and the shunt is located in the positive lead.

    Anybody ever seen one of these little Chinglish meters that sense current from the positive supply? Even at triple the price it would solve a problem for me.

    Thanks,

    Jim IMG_0767s.jpg IMG_0768s.jpg IMG_0769s.jpg
     
  2. chartbundle

    chartbundle Line Up and Wait

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  3. Ghery

    Ghery Final Approach

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  4. Dana

    Dana Line Up and Wait

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  5. DaleB

    DaleB En-Route

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    A transformer-like coil sure can work for current sensing. It's a Hall effect sensor.
     
  6. chartbundle

    chartbundle Line Up and Wait

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  7. Ghery

    Ghery Final Approach

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