Original poster: "Chris Swinson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <exxos-at-cps-games.co.uk> Hey all, I am just about to build a large flat secondary coil. The wire length will be 2000ft, the wire dia is 1.6mm. I *think* this will be 500 turns at about 4foot dia. Anyone got any ideas if that sounds about righ before I wind the thing ? Thanks, chris