I do a lot of breadboarding. Anyone else? For the longest time I kept fumbling around looking for batteries, 7805's, etc., to power my breadboards. I got kind of sick of it so I ordered one of those cheap Chinese 5V/3.3V boards. Ugh. Bad soldering, ugly, and took up too much room on the breadboard. What's a guy to do?
Well, I designed a USB power adapter with 3.3V regulator and jumper to select USB 5V or 3.3V. It's really small, takes up only a corner of the breadboard. I always breadboard near my computer so for me, it's ultimate convenience. This one has an 800mA regulator on it and it's design for 5V USB input.
Then I realized a lot of folks use (2.1mm) DC jacks. So I designed a board for this as well. It's very slightly larger. Presently rated for 6V input, and I'll be soon releasing a lower cost version that can take 6-12V input.
Thought I'd see if there's any interest in such things. I have both listed up on my Tindie Store and it's all open source if folks want to make their own.