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QuestionUSB for Power? Pin
James Curran12-Feb-21 0:30
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(Apologies for the repeat --- I posted this in the Lounge yesterday, before someone pointed me to the proper forum)

For those in DIY electronics...

Exactly how good is USB for providing power to a device? I specifically mean devices that are not attached to a computer and use the USB cable strictly for power.

I've long felt that we need a standardized low-voltage DC power source coming right out of our walls, much in the manner that we currently have 120V (or 220V) AC coming out of our walls -- to eliminate the need of all those "brick" power adapters cluttering our power strips. The last time I discussed this publicly (about 10+ years ago), I was scoffed, with the reason being every device uses a different voltage. (I rejected that, as AC devices were able to adapt to use 110V, so DC devices could adapt to use the standardized voltage).

The real problem was that every device used it's own plug size (and selling the proprietary adapter was a profit center). However, now there's some movement to power things with USB cables.

So, the question for the electrically minded here: If all you had available to power your device was an USB cable, would that be viable?
Truth,

James

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