> > > ... > to make the circuit like the Indian man appears to be > doing. Indeed. Appears. He wipes a wire along his body and lights a lamp that is, say, to be conservative, 230 VAC 20 Watt. A much better estimate could be gained if one could be bothered watching more closely but this alone makes it an obvious hoax). The high voltage and low wattage present an ~=3D best case test. 230 VAc, 20W is about 0.1A flow and equivalent resistance of some small percentage of the load's resistance. Rload effective =3D Power/I^2 =3D 20/.1^2 =3D 2k. If he adds 50% of that his skin-wipe resistance is 1k. If he adds 10% - more likely given the visible result, it's ~~=3D 200 Ohms= .. For wires wipes across skin that's not feasible[tm] AND the physiological reactions to such currents would be severe. Even if he was totally pain immune his muscles would react appropriately The Neon voltage tester demo may be real - they light up on the smell of 1% of an oily rag. Producing sensors which detected high resistance conductive paths and switched loads as needed would be easy. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .