{"id":20514,"date":"2024-11-08T10:36:01","date_gmt":"2024-11-08T18:36:01","guid":{"rendered":"https:\/\/rustybolt.info\/wordpress\/?p=20514"},"modified":"2024-11-08T10:39:08","modified_gmt":"2024-11-08T18:39:08","slug":"2024-11-08-rf-amp-using-bd139-power-transistors","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=20514","title":{"rendered":"2024-11-08 RF Amp Using BD139 Power Transistors"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">He has a strong Aussie accent, a bit hard to understand.\u00a0 It&#8217;s a 28 min. YouTube video.\u00a0 He says BD139s have a fT of 250 MHz, but the datasheet I have does not specify any fT because the D in BD139 means they are a low frequency device, not meant for VHFs or RFs in general.\u00a0 This fT might be specified in some manufacturer&#8217;s datasheet, but it was never meant to be used at RFs so the experimenter could buy some completely legitimate BD139s that cannot amplify frequencies above 3 MHz.\u00a0 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><iframe loading=\"lazy\" title=\"BD139 Push Pull Amplifier Experiments - Part 1\" width=\"600\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/BMBfC8dOv8w?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>He has a strong Aussie accent, a bit hard to understand.\u00a0 It&#8217;s a 28 min. YouTube video.\u00a0 He says BD139s have a fT of 250 MHz, but the datasheet I have does not specify any fT because the D in BD139 means they are a low frequency device, not meant for VHFs or RFs in<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=20514\"> <\/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":[347,74,323,24,310,7,80,261,1284],"tags":[3805,3806,3807],"class_list":["post-20514","post","type-post","status-publish","format-standard","hentry","category-amplifier","category-electronic-components","category-electronic-design","category-electronics-books-documents-literature","category-fm-band","category-radio-frequency","category-transistors","category-transmitter","category-video-books-documents-literature","tag-bd139","tag-rf-power-amplifier","tag-youtube-video"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/20514","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=20514"}],"version-history":[{"count":1,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/20514\/revisions"}],"predecessor-version":[{"id":20515,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/20514\/revisions\/20515"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20514"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20514"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20514"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}