http://blockyourid.com/~gbpprorg/mil/herf/voltsamps/herf005.html http://blockyourid.com/~gbpprorg/mil/herf/voltsamps/herf005.... A HERF device is actually prett

http://blockyourid.com/~gbpprorg/mil/herf/voltsamps/herf005.html http://blockyourid.com/~gbpprorg/mil/herf/voltsamps/herf005.... A HERF device is actually pretty simple to cobble together, if you don't mind size and high power consumption. Making it portable is more of an engineering challenge, but if you can purpose-build a magnetron rather than using one from a microwave oven, the problem becomes easier to solve.