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what I dont understand is how to calculate number of turns in transformer (in all coils)i found this calculator in internethttp://www.daycounter.com/Calculators/Flyback-Transformer/Flyback-Design-Calculator.phtmlproblem to use this calculator is I dont know the Al values of cores. I went to the local shop,they had these ferrite transformer cores (no model numbers as always), so I cant figure out Al value

problem to use this calculator is I dont know the Al values of cores. I went to the local shop,they had these ferrite transformer cores (no model numbers as always), so I cant figure out Al value

SMPS do seem to have a bit of 'black magic' in their design but can be understood.

You must know the un-gapped core's AL. Does your school have an inductance meter? If so then wind 10 turns on the core and measure the inductance. Then calculate the AL.

anyway what is your idea about using Al value from known core with similar dimension to unknown one

applied power, and booooom Ic blew Grin