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Thread: Is the 5 volt USB supply from a computer clean

  1. #11
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 832
    I'm Chris.

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    Quote Originally Posted by Cycleallday View Post
    I use one of these, along with a couple a similar ex Maplin batteries/chargers with all my Pi's and would not go back to any mains tethered device.

    https://www.amazon.co.uk/HUAF-Portab.../dp/B07M6JFCLZ


    The HUAF in particular is one i like - it has a quality feel, amazing battery life and can power 2x 2.5 amp devices and a 1x 1amp device at the same time should you wish.

    Its a bit bigger and heavier than it may look - about the size of an iphone 6 plus and slightly heavier.

    Its also good for charging my iphone and bluetooth earphones so gets plenty of use.

    Mel
    Thanks Mel, that's an interesting alternative. Would I be right in saying that as its a battery in complete isolation there can be no distortion noise, or does the fact its a sensing charger mean there is something else electrical going on.
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  2. #12
    Join Date: Oct 2016

    Location: Hampshire

    Posts: 291
    I'm Mel.

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    It is a 'smart' battery in that if the power draw is removed then the unit switches off. This i find useful as sending a power off command to the pi (via wifi) also switches off the battery.

    I hear no degradation using this type of unit and would not move to anything else. I do have an Audiophinics linear psu but have not used it with the pi's since starting down the battery route.

    Mel

  3. #13
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,097
    I'm Alan.

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    Quote Originally Posted by Andy831 View Post
    On the back of the OP question, if an item of kit asks for 5v 3a to power it is it ok to feed it 5v 2a or will that cause problems?
    Often the spec for kit in question will be over estimating what is required. I usually like to measure the actual current that the kit will take.

    Also most Chinese power supplies over specify what you can actually get from them. The sellers presume that because it has a, say, 50VA transformer fitted then you can get V times A DC output power equalling 50, which you most definitely can't> There are losses associated with conversion from AC (the transformer rating) to DC (the output rating).
    As a rule of thumb say 2/3 of the published current specification.

  4. #14
    Join Date: Jan 2008

    Location: Out on the wild and windy moors Lancs / Yorks Border

    Posts: 440
    I'm Andy.

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    Thanks Alan

    Sounds a bit complicated I will just buy a 5v 3a supply I think.

    Andy
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