Hello to you, I have an old circuit (drum machine salvaged from an old organ) that I'd like to get working. It requires three voltages: +15v, -28v and -14v. Ideally, I'd like to use something like a 30v DC adaptor/wall wart and make a circuit using vero-board to convert it to these voltages (or thereabouts). Is this feasible? If so, any suggestions, books, websites, online circuit diagrams that would show how to do this? I'm not very knowledgeable about electronics though I've built several projects over the years. Any help appreciated, Barry.