Adam Stouffer wrote:

Patrick Turner wrote:


I have my own methods of working out OPTs,
but I tried to download the above OPT program
to make comparisons.

It downloaded to my program files but
would not instal on my PC.

Patrick Turner.


Hmmm try this updated and smaller version. Beware the installer is in
french

http://perso.wanadoo.fr/yves.monmagnon/OPT_da-211.zip

I have just posted a screenshot of the results to ABSE. The file was
originally posted at diyaudio.com.

Adam

I got the above to work.

The spread sheet for the tranny does not include the
cross sectional diagram of the bobbin, and one doesn't know what
the stack height, tongue width, window length or window height is.

No real clear details appear for the wire sizes, and possible secondary
arrangements for various Z matching.

Its very easy to have a formula calculate turn numbers based on
power and RL and the basic stuff, getting the program to think like a
skilled
and practised designer who has wound lots of OPTs is a much harder task.

When altering the current density A/mm.sq, the other numbers don't
change,
but in a real tranny design, going from 2A/sq.mm to 3A/sq.mm would
cause an enormous design change to size and turns.

So a lot lot more refinement is needed before I would bother using this
program.

I use about 65 consecutive steps when designing a PP OPT.

I can do any design quite fast, because the 65 steps are all in my head,
but when i actually listed them all out so someone else could follow,
there were a large number of things to get right and check when you're
done.


I will try the longer vesion of 4.4 MB again.
I think I may have clicked the wrong thing first time during instal.

Patrick Turner