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Hi all,

I am resurecting an old project atm and I need to build a powersupply, 
it will take in an average of 120Vdc (from ~100 - 160Vdc) and provide 
regulated 24V and 5V rails. Total wattage around 60W.

I chose the uc3842 SMPS controller as the regulator. I am trying to work 
out the design of the transformer.

I am using a ferroxcube ETD34/17/11 with the 3C90 cores. I have worked 
the example in the philips UC3842 appnote ( 
moon.feld.cvut.cz/hw/philips/acrobat/8014.pdf ) Using the values of the 
EC35 core with the 3C81 core (it says a 3C8 core but I can find no info 
and believe the last digit is missing)

I am getting very strange results in my calculations and as transformer 
theory is not my area, I need some help lol

TIA

Kat.
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