{"id":7794,"date":"2013-06-26T09:09:36","date_gmt":"2013-06-26T16:09:36","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=7794"},"modified":"2013-07-15T11:15:39","modified_gmt":"2013-07-15T18:15:39","slug":"2013-06-26","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=7794","title":{"rendered":"2013-06-26Germanium Joule Thief Uses a 2N404"},"content":{"rendered":"<p><a href=\"http:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/06\/P1030763.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-8038\" alt=\"P1030763\" src=\"http:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/06\/P1030763-300x226.jpg\" width=\"300\" height=\"226\" srcset=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/06\/P1030763-300x226.jpg 300w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/06\/P1030763.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>This is one of those Joule Thiefs that uses an old germanium 2N404.\u00a0 But I got them from a German seller on eBay, and I have a suspicion that they were made within the last decade or so, probably by one of the makers in the former soviet bloc countries.\u00a0 I&#8217;ve measured true 2N404s and they don&#8217;t have high gain like these do.<\/p>\n<p>The LED is white but looks bluish in this picture.\u00a0 It&#8217;s still bright even though it&#8217;s running off a depleted AA cell, with only 0.87V left in it.\u00a0 The resistor behind the coil is 1k.\u00a0 By the time the LED dims to nothing, the AA cell will be below 0.2V, probably 0.1V or maybe less.\u00a0 That&#8217;s DEAD!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is one of those Joule Thiefs that uses an old germanium 2N404.\u00a0 But I got them from a German seller on eBay, and I have a suspicion that they were made within the last decade or so, probably by one of the makers in the former soviet bloc countries.\u00a0 I&#8217;ve measured true 2N404s and<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=7794\"> <\/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":[4,80],"tags":[],"class_list":["post-7794","post","type-post","status-publish","format-standard","hentry","category-joule-thief-smps-dc-dc","category-transistors"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7794","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=7794"}],"version-history":[{"count":6,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7794\/revisions"}],"predecessor-version":[{"id":8042,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7794\/revisions\/8042"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}