{"id":2842,"date":"2012-05-18T08:40:36","date_gmt":"2012-05-18T15:40:36","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=2842"},"modified":"2012-05-30T10:38:11","modified_gmt":"2012-05-30T17:38:11","slug":"2012-05-18","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=2842","title":{"rendered":"2012-05-18 Watson&#8217;s Tiny Toroid Joule Thief"},"content":{"rendered":"<p><a href=\"http:\/\/rustybolt.info\/wordpress\/?attachment_id=2967\" rel=\"attachment wp-att-2967\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-2967\" title=\"DSC_0042S2\" src=\"http:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/05\/DSC_0042S2-300x224.jpg\" alt=\"\" width=\"300\" height=\"224\" srcset=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/05\/DSC_0042S2-300x224.jpg 300w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/05\/DSC_0042S2.jpg 802w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>I had hundreds of pictures in my old watsonseblog blog, which went away when the blog was removed.\u00a0 I&#8217;ve probably got the pics somewhere in the thousands of digital pictures that I&#8217;ve taken, but I haven&#8217;t got the time or inclination to go back through all of the pics to find them.\u00a0 So I just pull out one of those old circuits and take another pic of it &#8211; it only takes a few minutes.<\/p>\n<p>This one was probably before 2011, maybe 2010, when I found some of those tiny toroids at <a href=\"http:\/\/www.surplussales.com\/Inductors\/FerToro\/FerToro-3.html\">surplussales.com (it&#8217;s the T231212T)<\/a>.\u00a0 The core is less than 1\/4 inch or 6 mm O.D.\u00a0 They have a high permeability and work well for making a really small JT.\u00a0 And they&#8217;re inexpensive, about a quarter apiece.\u00a0 I wound this one trifilar, with three strands of 30 AWG (.25mm) enameled, and put two of the windings in parallel for the primary winding.\u00a0\u00a0 I think the wire length was about 7 inches or so.<\/p>\n<p>The perforated circuit\u00a0 board is 1 inch (25mm) long by 7\/16 inch (11mm) wide.\u00a0 This one is quite a contrast to the <a href=\"http:\/\/rustybolt.info\/wordpress\/?p=2933\">big monster toroids I blogged recently<\/a>.<\/p>\n<p>Back to experimenting&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I had hundreds of pictures in my old watsonseblog blog, which went away when the blog was removed.\u00a0 I&#8217;ve probably got the pics somewhere in the thousands of digital pictures that I&#8217;ve taken, but I haven&#8217;t got the time or inclination to go back through all of the pics to find them.\u00a0 So I just<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=2842\"> <\/p>\n<p> (Read More&#8230;)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2842","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2842","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=2842"}],"version-history":[{"count":11,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2842\/revisions"}],"predecessor-version":[{"id":2966,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2842\/revisions\/2966"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}