What Toroidal parts do i need

[amxen]

Thanks jazz i now have them all book marked. i have noticed you have visited this subject many times over the years and i respect your views on newbies and electronics. I still cant find a good newbie how to on this subject eg a step by step how to for people that can use a soldering iron and a mulitmeter but have no real electronics knowledge. I mean i can strip a combi boiler into it component parts and test each part to determine if its working or not. I can test resistance on a thirmister at a given temp , test continuity on a gas valve . but im not clued up enuf to go at this with out a thought for safety ,even thow its more than likely going to be easy. Is there a good how to on the net. iv been looking all day ?