Block FS-1ETD Series Size 59/31/22 Ferrite Transformer Cores
FS-1ETD series size 59/31/22 ferrite transformer cores made from N87 with a cylindrical centre leg. These ETD ferrite cores are available with air gaps inserted: Stock number 840-7428 has a 0.1mm gap Stock number 840-7516 has a 0.2mm gap Stock number 840-7597 has a 0.5mm gap Stock number 840-7670 has a 1.0mm gap