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Help with powering a circuit board

Discussion in 'General Electronics Discussion' started by mouiylus, Feb 16, 2017.

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  1. mouiylus


    Feb 16, 2017
  2. Audioguru


    Sep 24, 2016
    A 5V charger does not have a regulated voltage. It might be 10V or more when it has a low current load that might blow up your screen.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    If disagree with that. Most chargers these days are switchmode power supplies which have pretty good output voltage regulation. This will almost certainly be true if the charger has a USB socket.

    Beware that a charger can supply the required current, and preferably more.
    Terry01 and davenn like this.
  4. AnalogKid


    Jun 10, 2015
    Depends on the age and (really) the weight of the wall wart. Old warts have a big lump of iron in them, the linear power transformer. New chargers have a small switching power supply with a much smaller transformer. So if it feels almost like it's empty, that is a regulated switcher. If it's the size of a golf ball but heavier, that's a linear.

    Or, you could measure the output voltage unloaded.

    (*steve*) likes this.
  5. FuZZ1L0G1C


    Mar 25, 2014
    If using it next to your desktop, and your computer's PSU has enough wattage, you could get regulated 5VDC from the outer pins 1 and 4 of a USB port.
    1=Vcc+ (Red) ; 4=0V (Black).
    Suggest you first check the load of the screen, and current capacity of your PSU for 5 volts.
    Terry01 likes this.
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