looks interesting, like on the "other" usupply, another 7mm between the knobs would be ideal, (enough to push your index finder between to turn and not have the finger joint catch on the upper one)
also like the look of how simple it looks, (perhaps add a Vin and ground pad for people who might want to make this battery powered, but nothing more on that front i would think)
still the back looked rather bulky, but not quite bulky enough for a transformer, i would then guess a charge pump?
still if the box it end up using is about as thick as a fat calculator, then i would think it would make a great kit / tool, likely using 90 degree binding posts, or...? binding posts mounted to box and a small connector used? but thats for you to enlighten us on i suppose