/diy/ - Do It Yourself

I updated to also USB two 3xAA string led lights I had. I kept the batteries space in case I want to use them with batteries, but usually I use them with powerbanks or even usb charger.

Simple setup, I cut and use a USB cable, and I add resistors as other anon mentioned. in the first one I checked the drained mAmpers and added resistors accordingly, to the second one I checked the brightness. Watch out if your lights draw a lot of power to have bigger resistors so they will not get very warm. A really simple and lazy hack. Also a very space economic.

The second string lights had a 3-leg switch so it prevents to use usb and batteries together, it takes power from one or another (no both off option). The first one needs batteries removed before I connect the usb