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Combining FT240 and FT140 cores And theire AL values

Writer's picture: xtgabyxtgaby

Updated: 2 days ago



Did you know that an FT140 core fits exactly in an FT240 core?



















FT240 - 31 with 2 x5 turns (upper picture left)


FT240 - 43 with 2 x5 turns (upper picture middle)


FT240 - 31 with 2 x5 turns combined with FT140 - 43 (upper picture right)


The AL figure for ferrite cores it is quoted as mH/1000 turns.















Comparison of the common mode rejection


Setup: resistors are 56 Ohms















the setup gives a loss of 4 dB which is calibrated away with the mini VNA


The results:



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