I made it from a 250ma 12 volt DC supply that plugs in the wall. I soldered good alligator clips on both of the power supply leads. I've been using the same power supply I started out with but after some use the wires will need replacing, which I've done several times. I use a ceramic bowl with the positive attached to a spoon that I found metal detecting, stainless seems to work the best, then fill the bowl with water and sprinkle a few tablespoons of baking soda in it, attach the negative terminal to whatever it is you're cleaning, put the item in the bowl without touching the spoon cause it will ruin the power supply if it's touching long enough. Plug it in and let it bubble. I use to use salt but it's too hard core and will eat up the spoons in a hurry, it does work faster with salt but it's really messy and you'll get a lot of nasty stuff in the water in a hurry. I even tried laundry detergent once because of the large amount of sodium in it but it's too hard core also. When I did the watch I kept a close eye on it just making sure it wasn't going to fall apart, they're pretty tuff, anyway the green stuff just bubble away and I was finally able to open the watch up and get a better look inside. When you take whatever it is you're electrolysising out of the water spring baking soda on it, it will melt right into the crud that's still there and then use a toothbrush and when you're finally satisfied with the way it looks a toothbrush and dishsoap will neutralize and rinse away the residue.