How to make 3.7v a spot welding machine ...

Steve Martin had a bit that was like a fake infomercial where he says, “You can be a millionaire and never pay taxes!” The instructions were, “First, get a million dollars. Then ...

and we often wonder how much real use they get other than “hey look I built a spot welder!”. I myself made one, but then ended up buying a professional one because it works better. Not ...