Hello All, I am interested in constructing a small Hofmann apparatus for electrolysis (as a hobby), like this kind: http://en.wikipedia.org/wiki/Hofmann_voltameter I am confronted with the choice of either using a bunch of 9V batteries, or some kind of AC/DC rectifier. As I am a chemical engineer and have taken 1 physics class on electricity, I consulted my old textbook and found that building one from pieces is probably beyond me. My question, then, is this: Is there some simple (cheap) AC to DC converter that can plug into a US residential wall socket and also has leads to hook up alligator clips or something similar for the apparatus? It sounds kind of dangerous as I type it out. It would need ~9V out (somewhere in the 6-15V range is fine). I've looked for one, but it seems you can either plug it into the wall or have nice leads, but not both. Any help and (especially) advice is appreciated.