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Help with powering a circuit board

Audioguru

Sep 24, 2016
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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.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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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.
 

AnalogKid

Jun 10, 2015
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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.

ak
 

FuZZ1L0G1C

Mar 25, 2014
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Mar 25, 2014
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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.
Clive.
 
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