{"id":5043,"date":"2012-11-19T07:50:21","date_gmt":"2012-11-19T15:50:21","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=5043"},"modified":"2012-11-27T16:05:01","modified_gmt":"2012-11-28T00:05:01","slug":"2012-11-19-tbd","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=5043","title":{"rendered":"2012-11-19 Joule Thief with 120 VAC Light Bulb -Part 4"},"content":{"rendered":"<p>I built the &#8220;Joule Thief&#8221; circuit in <a href=\"http:\/\/www.youtube.com\/watch?v=F2b7G-Z5B6w\"><strong>this Youtube video<\/strong><\/a> by Xee2 \/ Xee2vids.\u00a0 This uses a Radio Shack Cat # 273-1365 transformer, an E13007 transistor and a 51 ohm resistor.\u00a0 He also puts a 200uF capacitor across the resistor and a 14 millihenry choke in series with the resistor.\u00a0 The 120VAC primary is turned around and becomes the secondary, driving a 120VAC LED light bulb.<\/p>\n<p>I used the same transformer, a 47 ohm wirewound resistor, a 220 uF capacitor and the same 40 turn inductor using the same toroid no longer available from Goldmine Elec.\u00a0 I used a 2N3055 transistor, mainly because I could see no reason why the E13007 would be better than the 2N3055.\u00a0 The voltages on the transistor are very low, less than 12V.\u00a0 The E13007 is made for much higher voltages, the 2N3055 can handle 60 volts; both far exceed the voltages in the circuit.\u00a0 The average experimenter is not going to be able to find the E13007 as easily as the 2N3055.<\/p>\n<p>The LED light I used was the Lights Of America 2325LEDE12-LF4 2 watt, 110 lumen,\u00a0 27 LED candelabra base light.\u00a0 It lights up nice and bright in the circuit.<\/p>\n<p>I varied the supply voltage from 1.5 to 5 volts.\u00a0 The supply current changed from about 450 to 600 mA from 1.5 to 2.25V.\u00a0 Above 2.25V to 5V it changed only slightly above 600 milliamps, uncharacteristic of a typical JT, which would vary from low to high.<\/p>\n<p>I shorted out the choke and the light brightness didn&#8217;t change, but the supply current went down a few tens of milliamps.\u00a0 From that I came to the conclusion that the choke really was not necessary..<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I built the &#8220;Joule Thief&#8221; circuit in this Youtube video by Xee2 \/ Xee2vids.\u00a0 This uses a Radio Shack Cat # 273-1365 transformer, an E13007 transistor and a 51 ohm resistor.\u00a0 He also puts a 200uF capacitor across the resistor and a 14 millihenry choke in series with the resistor.\u00a0 The 120VAC primary is turned<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=5043\"> <\/p>\n<p> (Read More&#8230;)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,13],"tags":[],"class_list":["post-5043","post","type-post","status-publish","format-standard","hentry","category-joule-thief-smps-dc-dc","category-lighting"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/5043","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=5043"}],"version-history":[{"count":13,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/5043\/revisions"}],"predecessor-version":[{"id":5157,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/5043\/revisions\/5157"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5043"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5043"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5043"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}