Pluslife power supply for use in the US

&#xA; &#xA; &#xA; Background &#xA; Quickstart &#xA; &#xA; Inexpensive wall-power solution &#xA; On-the-go battery-powered solution &#xA; &#xA; &#xA; Noise Testing USB Power Supplies in 5V DC mode &#xA; &#xA; Test setup &#xA; Test results &#xA; &#xA; &#xA; Discussion &#xA; &#xA; &#xA; &#xA; Background &#xA; A group of us (Covid-cautious companions in the Seattle area) have recently acquired…