On the original electrifried site, he advises that you don't do it to anyone with a pacemaker. But other than that, it is not harmful. However, you do feel the same effects as your audience member.
I built this a year ago and it works fine. However, as has been already mentioned, the 12VDC generator seems to have been discontinued. If anyone can find a 12VDC generator anywhere, I strongly recommend building this, as it is an amazing device, and the original is way overpriced.
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