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I use UU cores from Amazon - UY1658 5 sets package . Also sold on Ebay + Aliexpress. These are the larger type. I hold them together with 5/8" spring steel hose clamps. Can hand wind easily on one end or both.
The smaller, thinner UU cores are available from Alltronics LLC. 2 for $7.95 + shipping. Uses Smaller spring clamps. I also made 2 brass threaded rods with 4 brass nuts 4:40 thread, and 2 plastic cut out pvc end plates with 2 holes. I sometimes wrap peel + stick 1/16" cut rubber strip on core first for high volts insulation.
You can also purchase complete 3 piece ferrite E core types with bobbin, in many sizes. (allowance room for magnet wire) The bobbin is enclosed. Have outside spring clips to hold together.
I also got many used flyback transformers from taking apart 280 old tv's to get the ferrite pieces. The small ones are put in pan of boiling water to loosen the glue. Then carefully pry apart.
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Topic: Ferrite UU Core Sets - Easier To Wind (Read 2895 times)
