[Paul] recently purchased an inexpensive USB power pack ... Now you can’t just hook up the 22 ohm resistor to a 5V power supply for the sake of keeping it on — that would draw 1.1watts ...

3A 【Widely Application】It is for 5V/3A equipment DIY power supply and maintenance replacement, such as LED desk lamp,usb fan,small appliance light belt,power adapter,power charging stand ...

I had to source USB power supplies for a product ... Also, why was the output 4.7-5V, and why did my scope say 5.5V (but surprisingly stable)? Inside was a completely different beast.