Peter Hynes PO Box 285, Burwood 3125, Victoria, AUSTRALIA FAX: Int-613 9809 0604 EMAIL: elek@netstra.com.au URL: http://www.netstra.com.au/~elek/ ---------- Hi, Many thanks to the guys who responded re my transformer question. Sorry for not offering thanks sooner but I've been having some _major_ computer probs. That tip about calculating the inductance first was very helpful. Regards - PJH