After working with Louder ESP for a while I discover few improvements that I'd like to introduce. 

First, I wanted to add barrel jack, so I can use off the shelf power sources. For testing you can use small 9-12V wall power sources, that you can buy for a few bucks. I decided to keep bolt connector though, as it be more useful for stationary setup.

While I had a chance I also improved labeling on the board, essentially placing all the polarity marks. I should have done that in the first revision really.

Having those changes, Louder ESP is back in stock and available for purchase on Tindie