THanks Emerald it's the basics I am after really. Used to do a bit of electronic stuff back when I was younf bloke - audio mainly mono / stereo and - with valves (vacuum tubes) then along came IC's pretty basic stuff then and the CPU's and chipest these days are light years ahead of what I understand.
Plus I do seem to irritate some of the younger tech savvy folks with stuff I ask - and although they can be pretty rude at times, then there are other times when it's quite entertaining to seee what they write. Having said that I don't like the language at times especially when there are the fairer sex on the forums. Call me old fashioned I suppose.
Anyway rambling (bad habit - but won't make me go blind LOL!!) thanks for your welcome reply again.