RM10 core - Center hole question

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edaenrico

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Hi,

does anybody know why some RM10 cores have a center hole?

What's the purpose of the center hole?

thanks,
Enrico Migliore
 

The center hole can have thread. When using a core with an air gap, a tubular ferrite can be screwed into the hole to change the AL value, hence the inductance. This is frequently used in filters that require tuning.
 
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