Don't you mean a few hundred mV. I produce 0.5V hand to hand. Higher voltages are only produced in long conductors like wire because of atmospheric potential and moving through the earths magnetic field to a much lesser extent. I once was caught flying a kite in the rain with a thunderstorm five miles away. As I took the kite in I had to wear gloves as the 200 foot of line gave me huge electric shocks! Tim Kerby At 10:13 10/12/97 -0800, you wrote: >>With a sensitive instrumentation amp you can measure the voltage >difference >between your feet and your head (usually a couple hundred volts >over six feet). > >This is really interesting! > >But if it's a couple of hundred volts, why do you need a sensitive >instrument amp? > >Bruce > > ------------------------------------------------------------------ Personal Web Pages: http://web.ukonline.co.uk/members/tim.kerby/ Email: tim.kerby@ukonline.co.uk ------------------------------------------------------------------