{"id":11325,"date":"2016-08-27T23:38:37","date_gmt":"2016-08-28T06:38:37","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=11325"},"modified":"2016-08-28T13:12:47","modified_gmt":"2016-08-28T20:12:47","slug":"2016-08-27-toroids-info","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=11325","title":{"rendered":"2016-08-27 Toroids.info"},"content":{"rendered":"<p>I ordered a few toroid cores today, and I used this <a href=\"http:\/\/toroids.info\">toroids.info<\/a> to find the turns and inductance for some cores.  It has a basic calculator that can give the information for the cores in the list.  Most of the cores were chosen for RF projects, so some very large cores are shown.  The T cores such as T-50-6 are powdered iron cores, with low permeability.  The FT cores are ferrite cores, the permeability is medium to high.  The FB are ferrite beads, usually smaller than a toroid.  The BN are baluns, also called multiaperture cores &#8212; they have more than one hole.<\/p>\n<p>The -0 core is tan \/ tan, but it&#8217;s actually not magnetic, it&#8217;s just a core made of light brown phenolic plastic, to hold the wire in a ring.<\/p>\n<p>I have used quite a few FT-37-43 cores for Joule Thiefs.  They work nicely.  The equivalent is Fair-Rite 2643002402 and they call it a ferrite bead, even though it looks like a toroid.  The Fair-Rite 2673002402 looks the same but has a higher permeability.<\/p>\n<p>These cores a small and they typically cost less than a dollar.  As the cores get bigger, the cost goes up, until cores of 2 inches or 50 mm cost several dollars apiece.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I ordered a few toroid cores today, and I used this toroids.info to find the turns and inductance for some cores. It has a basic calculator that can give the information for the cores in the list. Most of the cores were chosen for RF projects, so some very large cores are shown. The T<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=11325\"> <\/p>\n<p> (Read More&#8230;)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-11325","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/11325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11325"}],"version-history":[{"count":5,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/11325\/revisions"}],"predecessor-version":[{"id":11330,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/11325\/revisions\/11330"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}