There are a lot of design issues involved in winding a transformer - too
many to get into here in detail. Your basic issues a

1) Core material and saturation level
2) Enough primary windings to get sufficient field but not saturate core.
3) Thickness of primary winding.
4) Isolation between primary and secondary.
5) Secondary winding - turns and thickness.
6) Losses and temperature rise.
7) Change of characteristics as temperature rises.
8) Making it fit on a particular core/bobbin.

Best would be to find a transformer of similar power level where the primary
is wound first and you can remove the secondary and replace with your own.

I have a big Excel spreadsheet somewhere which assists in transformer design
but I'm not sure I can still find it and it does require some knowledge and
experience to use.


its you wrote in message
...
Kind of an off question, but I'm searching for a 60V CT (30-0-30)
transformer (1-2A is fine) for an amplifier I've been building. Would
I be better off just shelling out the cash and getting one, or is it
realtively easy to build your own (there are all sorts of torridial
cores avaliable at a local store, all for under 5$) I realize that
purchasing one would of course be the ideal situation, but I don't
particularily feel like spending 35$ for just a transformer... Anyone
have any recommendations where to look to buy one of these? Is
homebrewing one of these transformers relatively complicated? All
thoughs, including negative, are appreciated. Thanks in advance,
Steve