You're absolutely right...kinda like Ghostbusters...NEVER CROSS THE STREAMS! If the metal pieces touch, the unit will short circuit and may catch fire. This is a quick and dirty prototype, but they don't touch.I heard the top and bottom wired up metal pieces should not touch each other.
I had this tea-ball in my drawer, it works. Voila.Could have used flat metal pieces to save a bit of space.
Sure doesDoes yours produce bubbles? (Hydrogen and Oxygen)