---------- From: ESchulz531 [SMTP:ESchulz531-at-aol-dot-com] Sent: Friday, April 03, 1998 5:39 PM To: tesla-at-pupman-dot-com Subject: Re: ballast Inductor Choke coil (fwd) WHAT, N = SQRT (38200 * ((9 * 3) + (10 * 12))/3 * 3) Then: N = 1475 turns would be required Sorry but you are wrong it is 789.895 But you are right about the coil, anybody know the equation for a multilayer cylinder coil? Erik