{"id":7349,"date":"2013-05-15T11:24:00","date_gmt":"2013-05-15T18:24:00","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=7349"},"modified":"2013-06-29T19:07:50","modified_gmt":"2013-06-30T02:07:50","slug":"2013-05-15-phase-shift-oscillator-jfet-stabilized","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=7349","title":{"rendered":"2013-05-15 Phase Shift Oscillator, JFET, Stabilized"},"content":{"rendered":"<p><a href=\"http:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/05\/P1030544S2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-7350\" alt=\"P1030544S2\" src=\"http:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/05\/P1030544S2-300x230.jpg\" width=\"300\" height=\"230\" srcset=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/05\/P1030544S2-300x230.jpg 300w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2013\/05\/P1030544S2.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>Drawn May 14, 2013.\u00a0 I plan on building it soon.\u00a0 I think it would be better to replace the 82k with a 130k and use a smaller value pot, maybe 25k.\u00a0 I may have to use some 1% precision resistors and capacitors to get the frequency to be stable over a temperature range and supply voltage range.\u00a0 The idea is to be able to receive this with the superregenerative receiver that I blogged earlier, and use the signal to close a relay to tell me the garage door is open.\u00a0 The receiver will have a band pass filter to prevent false triggering by noisy interference.\u00a0 I got the formula out of a website, but I think the formula\u00a0 should read Fo = 1 \/ (2 * Pi * R * C * sqrt(6)), in other words the 1 should be divided by the whole expression.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Drawn May 14, 2013.\u00a0 I plan on building it soon.\u00a0 I think it would be better to replace the 82k with a 130k and use a smaller value pot, maybe 25k.\u00a0 I may have to use some 1% precision resistors and capacitors to get the frequency to be stable over a temperature range and supply<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=7349\"> <\/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":[8,17],"tags":[],"class_list":["post-7349","post","type-post","status-publish","format-standard","hentry","category-audio","category-meters-and-test-equipment"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7349","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=7349"}],"version-history":[{"count":6,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7349\/revisions"}],"predecessor-version":[{"id":7352,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7349\/revisions\/7352"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}