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Voltage variations damage?

Discussion in 'Electronic Basics' started by jim stone, Oct 23, 2012.

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  1. jim stone

    jim stone Guest

    Have just received by post a 'Fone Storm' car charger for a Huawei Ascend
    g300 phone. I wanted to check the specs to see if I had been sent the right
    one for this phone.

    On the box it says input DC 12v-24v. Output DC 4.2v - 10v. 500ma, max

    I always understood that tiny components could be damaged by even fairly
    minor variations in voltage, so am surprised that the output can be stated
    as 4.2v - 10v. It was very cheap only £2. Would I be safer to spend more
    and get the official Huawei charger?
  2. Hi Jim, I don't know about the particular phone. But it's certainly
    possible that the phone can handle a range of DC input voltages for
    charging. Is there some specification for this in the phone manual?
    That might give you some peace of mind.

    George H.
  3. Jasen Betts

    Jasen Betts Guest

    some of these devices have a voltage that is configured by the customer,
    eg: by selecting the right tip for the cable, (or by selecting the
    right cable) or turning a selector screw...

    I would want to see a similar voltage figure to that which is given
    for the mains powered charger.
  4. I've seend this dubious output rating of 4 to 10 or 4 to 9 volts on
    generic garbage micro usb chargers off ebay.

    they don't work right with many phones, in case you were curious.
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