{"id":146,"date":"2013-10-26T15:57:00","date_gmt":"2013-10-26T04:57:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2013\/10\/26\/bitx-build-update-17-arvs-discrete-af-amp\/"},"modified":"2025-07-20T12:40:36","modified_gmt":"2025-07-20T02:40:36","slug":"bitx-build-update-17-arvs-discrete-af-amp","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2013\/10\/26\/bitx-build-update-17-arvs-discrete-af-amp\/","title":{"rendered":"BITX BUILD UPDATE #17   Arv&#8217;s Discrete AF AMP"},"content":{"rendered":"<div class=\"separator\" style=\"clear: both; text-align: center;\"> <a href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2013\/10\/P1010203.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" height=\"239\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2013\/10\/P1010203.jpg\" width=\"320\" \/><\/a><\/div>\n<p> <strong>I&#8217;ve been kind of cheating with the audio output from my BITX17: I&#8217;ve been using one of those little battery-powered computer speakers. It sounded fine, but hey, this is supposed to be a homebrew project right? I&#8217;ve already noted my ideological objections to the use of the LM386 CHIP. The files of the BITX20 yahoo group provided a very promising and completely discrete <a href=\"https:\/\/sites.google.com\/site\/arvidevans\/discretecomponentafamplifier\">AF amp circuit<\/a> by Arv Evans, K7HKL. I used a 2N3906 and a 2N3904, with a 2N2222 driving them. It works like a charm. Not a bit of feedback or motor-boating. It sounds great. I&#8217;ve already had a contact with it: Jack, W7YUM is a builder of big amplifiers out in Salt Lake City. He seemed very impressed with the BITX concept so we may have a Utah BITX in the works.<\/strong> <\/p>\n<p> book: &#8220;SolderSmoke &#8212; Global Adventures in Wireless Electronics&#8221; <a href=\"http:\/\/soldersmoke.com\/book.htm\">http:\/\/soldersmoke.com\/book.htm<\/a> Our coffee mugs, T-Shirts, bumper stickers: <a href=\"http:\/\/www.cafepress.com\/SolderSmoke\">http:\/\/www.cafepress.com\/SolderSmoke<\/a> Our Book Store: <a href=\"http:\/\/astore.amazon.com\/contracross-20\">http:\/\/astore.amazon.com\/contracross-20<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;ve been kind of cheating with the audio output from my BITX17: I&#8217;ve been using one of those little battery-powered computer speakers. It sounded fine, but hey, this is supposed to be a homebrew project right? I&#8217;ve already noted my ideological objections to the use of the LM386 CHIP. The files of the BITX20 yahoo &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2013\/10\/26\/bitx-build-update-17-arvs-discrete-af-amp\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;BITX BUILD UPDATE #17   Arv&#8217;s Discrete AF AMP&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":147,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-146","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitx20"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=146"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/146\/revisions"}],"predecessor-version":[{"id":148,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/146\/revisions\/148"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/147"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}