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QI chargers for multimeters

Discussion in 'General Electronics Discussion' started by (*steve*), Oct 12, 2013.

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  1. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    My wife just bought a new phone which has a "wireless charger".

    Whilst doing some investigation, I noted that the receiver coils are cheaply priced and the thought occurred to me that it would be possible to replace the battery in a multimeter with a small lithium cell and a charger based on these coils.

    I even wonder if I could use a supercap and just run the multimeter from a stored charge. I'm generally not interested in it running for hours at a time, and having it resting on a charging pad when I need that would be fine.

    (Supercaps have the benefit of not being damaged if allowed to run flat, unlike many batteries. Also they're easier to charge and don't explode)

    Hmmm....
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    I wonder whether you want the rf from the charger waver through the circuit under inspection on your workbench?
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    A valid point, and I had considered that I would have to test if it had some effect on the test equipment.

    The other possible problem was if I used a switchmode regulator to maintain a constant "battery" voltage, whether the ripple on the supply would affect the readings.
     
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