Hi, I'm considering buying/building a battery-powered "zapper" that will deliver a *mild* electric shock when the electrodes are touched. I'm *not* looking for a stunt gun. The intended us of the zapper is for teaching children about electricity (about electric shock, the danger of electrocution, & how electricity can travel through conductors). Safety is the no. 1 requirement. The "shock" should be no more painful than from a static discharge but should be continuous (unlike a zap from static). Does anyone have a schematic that uses easy to find parts (available from RS)? (I can imagine that someone will tell me the demo is a bad idea, but I can't think of a better way to help children understand electricity from a safety perspective than to let them experience first-hand a mild electric shock in a safe and controlled demo. If anyone has a better idea, I'd be interested.) Thanks.