There’s really no reason to overcomplicate it. I used a bridge rectifier and a 470uF cap because that’s what I had on hand but a 1000uF cap will give a little less ripple at higher loads. I bought some $3 buck converters with the idea that I could dial in 18VDC at the board but didn’t end up using one. The H10 is still running like a champ. It’s almost addicting to play with since it runs so well and I have another Blunami board on the way. 
I wouldn’t recommend a linear regulator for this sort of thing. Their best use is for lighting circuits imo.
