Hi,
Are there bobbins made for using EE cores, ie. EE42 as inductors? I have some EE bobbins but they have a lot of extra pins as they are meant for transformer winding. Also for stacking EE cores for making larger inductors the bobbins can no longer be used, what is the typical way of attaching these types of stacked inductors to a PCB, without the bobbin?
cheers, Jamie
Jamie Morken wrote in news:MdQ4k.1277$sg6.528@edtnps91:
When you purchase bobbins for production, you have many options, including:
1) short load pins 2) custom bobbinsExtra pins aren't usually regarded as a problem. Also, they provide additional mounting strength.
Stacked cores are not often spec'd for production. However, sometimes you see stacked cores wound over standard square plastic or saturated paper tubing, with bobbin ends (flanges) inserted during assembly.
Ferrites are compression molded before firing, so tooling for custom cores is inexpensive. Paul Mathews
A bobbin is just one kind of insulation, incorporating structural features. It can be replaced by any suitable insulation method in a new structure, if insulation is indeed required. Kraft paper, glastic and other aramid paper or reinforced polyester products are marketed for this purpose.
Pretooled bobbins are available for a wide range of lamination sizes and stack heights. The preshaped EE ferrite or iron dust cores attempt to duplicate more popular lamination and stack heights, in order to use pre-existing hardware without new tooling.
For pre-tooled sizes, check out vendors like Plastron, Cosmo, Elytone, Miles-Platts, or Yih Hwa.
RL
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