9V/12V/24V to 5V USB Step Down Power Module DC-DC 7.5V-28V to 5V 3A Precise Vehicle Charger Buck Voltage Converter Module 4Pcs

These did the job. I used them for an art project with an Arduino. They were a good value and the voltage worked correctly.

Cumple con lo indicado. Llegó a tiempo el producto.

This is a wonderful little circuit, It’s only about .75”x.75” and if you connect it to DC power source of 7.5 volts or more you’ll have an instant USB charger. Using a couple surplus connectors, scrap wire and pieces of PVC pipe I made a dual outlet USB charger, powered by a Lithium battery from a cordless drill. It took about an hour, not counting waiting for the paint to dry.When used for their designed purpose these things are great. A previous reviewer tried using them “off label” and unfairly rated them poorly.

I needed to convert 9v to USB power, and voila, easy, easy easy. Cheap and small are big pluses in my case.

Robust little board that steps down 12v to 5v so I can reuse some old alarm wiring in the walls to put cell chargers for repurposed tablets. I purchased to many because I didn't see that multiple came in an order... So now I am dreaming of more things to do with the extras.

First time I got this product, I was able to remove the USB plug and use out+ and out-. Recent order, it has changed completely and now I can't remove the USB plug.