{"id":3346,"date":"2012-07-31T13:27:34","date_gmt":"2012-07-31T20:27:34","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=3346"},"modified":"2012-07-30T13:28:01","modified_gmt":"2012-07-30T20:28:01","slug":"2012-07-31-joule-thief-beeper-by-quantsuff","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=3346","title":{"rendered":"2012-07-31 Joule Thief Beeper by Quantsuff"},"content":{"rendered":"<p>I got an email from QS saying that he posted a <a href=\"http:\/\/quantsuff.com\/LED2.htm\">Joule Thief Beeper to his web page<\/a>, about 2\/3 of the way down.\u00a0 I think it might make a metronome if the speed was adjustable.\u00a0 basically it&#8217;s a two transistor circuit with a single coil made from the voice coil of an 8 ohm speaker.<\/p>\n<p>I built one of these long ago, and used a 9V battery and small 2 inch speaker.\u00a0 The circuit worked for a while, then failed.\u00a0 The voice coil went open, possibly from excessive current, or else the voice coil vibrated itself to failure.\u00a0 With a supply voltage of 1.5V, there should be no problem with excessive current.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I got an email from QS saying that he posted a Joule Thief Beeper to his web page, about 2\/3 of the way down.\u00a0 I think it might make a metronome if the speed was adjustable.\u00a0 basically it&#8217;s a two transistor circuit with a single coil made from the voice coil of an 8 ohm<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=3346\"> <\/p>\n<p> (Read More&#8230;)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,4],"tags":[],"class_list":["post-3346","post","type-post","status-publish","format-standard","hentry","category-audio","category-joule-thief-smps-dc-dc"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3346","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=3346"}],"version-history":[{"count":3,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3346\/revisions"}],"predecessor-version":[{"id":3349,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3346\/revisions\/3349"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}