{"id":1308,"date":"2010-04-22T04:20:00","date_gmt":"2010-04-21T18:20:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2010\/04\/22\/good-vibrations\/"},"modified":"2025-07-21T11:13:28","modified_gmt":"2025-07-21T01:13:28","slug":"good-vibrations","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2010\/04\/22\/good-vibrations\/","title":{"rendered":"Good Vibrations!"},"content":{"rendered":"<p><a onblur=\"try {parent.deselectBloggerImageGracefully();} catch(e) {}\" href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2010\/04\/circuit_diagram.png\"><img decoding=\"async\" style=\"margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 311px; height: 400px;\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2010\/04\/circuit_diagram.png\" alt=\"\" id=\"BLOGGER_PHOTO_ID_5462812301102607234\" border=\"0\" \/><\/a><span style=\"font-weight: bold;\">Somehow this goofy circuit diagram (sent to me by Mike, KC7IT) seems appropriate this morning. That is because, gentlemen, this diagram represents the kind of homebrewer I&#8217;ve been this week. After far too much struggle, and with the kind assistance of wizards from around the globe, I succeeded this morning in making an astable multi-vibrator do its thing. Not exactly a momentous achievement, I know. What you may ask, was the problem? Simple: Hans Summer&#8217;s diagram called for 680K resistors from the power supply to base. But I somehow managed to put in two 68K resistors. This apparently results in an entirely different RC time constant! <\/span><\/p>\n<p><span style=\"font-weight: bold;\">Anyway, it is now percolating along nicely. The 2N2222s work fine, as do the two 10 uF electrolytics in parallel. It seems to produce a frequency of around one cycle every 15 seconds. That should be just about right for the QRSS FSK. <\/span><\/p>\n<p><span style=\"font-weight: bold;\">Thanks to all for the help and assistance provided. And thanks to<\/span><a style=\"font-weight: bold;\" href=\"http:\/\/xkcd.com\/\"> xkcd <\/a><span style=\"font-weight: bold;\">for the cartoon! <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Somehow this goofy circuit diagram (sent to me by Mike, KC7IT) seems appropriate this morning. That is because, gentlemen, this diagram represents the kind of homebrewer I&#8217;ve been this week. After far too much struggle, and with the kind assistance of wizards from around the globe, I succeeded this morning in making an astable multi-vibrator &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2010\/04\/22\/good-vibrations\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Good Vibrations!&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1309,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[165,198],"tags":[],"class_list":["post-1308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-qrss","category-summers-hans"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1308","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=1308"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1308\/revisions"}],"predecessor-version":[{"id":1310,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1308\/revisions\/1310"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/1309"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=1308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=1308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=1308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}