I saw one of those back in the 90's, i met a guy who bought one premade for around $100 . He used it in a Zenith Transoceanic, it worked ok on AM but it had harmonics that made shortwave listening impossible. If you didn't put the power supply inside of the cabinet the noise was slightly lower. I think it needed some shielding. Since there are so many cheap dollar store batteries available i think the assembled batteries pack is the way to go for me. but if there is a improved version of the dc to dc supply i might change my mind.
