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Transformer design
for example:
primary voltage=220v
secondary voltage=12v
secondary load =5A
Power = 60W
use feromagnetic core E+I
section of Core = √Power = √60=aprox 8cm²
freqenty of mains/sectinof core =number of sp/volt
50/8=6.3 sp/v
nr of sp/v of primary =220*6,3=1386...
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