Making air gap on ferrite E core

MacIntoshCZ

Active Member
I need to adjust air gap to lower inductance of coil. Biggest air gap i can buy core with is 3mm. I think i will need aprox. 6mm.
Any idea how to lower surface in the middle of E core? Thanks
 
Why not just try inserting a non-magnetic spacer, and so create a gap between all three limbs of the core?

JimB
 
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