High frequency switchers use ferrite EE cores. You cant really see it from the picture but the center posts are slightly shorter than the legs (About 0.015" total) and they are glued together with a drop of epoxy on the legs to hold them together. The reason that they gap core is to lower the inductance (Permeability of the magnetic path) which increases the saturation current and thus the energy storage capability. The reason they gap the center post is so that any leakage field is contained within the windings and faraday shielding to prevent radiated interference. Another benefit of the air gap is that slight errors in the mating surfaces have little effect on the inductance so long as those errors are a small percentage of the gap distance.
1. Cut the epoxy drops off the outer legs. 2. Heat the cores with a heat gut until the varnish is softened (an exacto knife pokes it easily). 3. Carefully pry the core on the top away from the bobbin. 4. Push out the bottom core with the center post 5. Clean up the excess varnish and polish the legs in preparation for re-assembly. 6. After re-winding the transformer, use a couple of drops of super glue on the outer legs to glue them back together. I'm curious about adding windings to the transformer. Is this particular > transformer constructed so you can pop-out the bobbin, or does it have > those obnoxious interleaved E-cores that require you to split them all > apart, recoat, etc ? Or worse yet, thread each turn thru the core ? > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/9cd93f60-60de-43ed-93f2-fda8b2bc159b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
