{"id":12552,"date":"2017-11-10T15:17:12","date_gmt":"2017-11-10T23:17:12","guid":{"rendered":"https:\/\/rustybolt.info\/wordpress\/?p=12552"},"modified":"2017-11-15T13:54:13","modified_gmt":"2017-11-15T21:54:13","slug":"2017-11-10-built-phase-shifh-oscillator-from-youtube","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=12552","title":{"rendered":"2017-11-10 Built Phase Shift Oscillator From YouTube\u00a0"},"content":{"rendered":"<p>I watched the YouTube video of&nbsp;<a href=\"https:\/\/youtu.be\/3ih2y4TloNg\">Radiofun232 testing the PSO<\/a>&nbsp;that he&nbsp;built according to the schematic he showed. &nbsp;I modified it somewhat. &nbsp;My objective was to decrease the frequency down to 400 Hz.<\/p>\n<p>I used three 0.1 uF capacitors and a 0.56 uF instead of the 0.47 uF. &nbsp;Instead of 1k I used 2.2k. &nbsp;I replaced the 1.8k collector load resistor with a 2.2k. &nbsp;I also used 9 volts, but I changed the base bias resistors from 3.9k to 4.7k, and from 12k to a 10k and 25k trimpot in series to allow adjustment.<\/p>\n<p>I used a 2N3904 instead of the BC547. &nbsp;I adjusted the collector voltage to 4.5 volts. &nbsp;I could connect the +9V, and sometimes I would see a slight blip on the scope and on the frequency meter, but not a continuous oscillation. &nbsp;There is not enough gain to sustain oscillation. &nbsp;The lack of an emitter resistor and bypass capacitor means this circuit will be too sensitive to temperature changes.<\/p>\n<p><a href=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2017\/11\/Screenshot_2017-11-12-11-15-393.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2017\/11\/Screenshot_2017-11-12-11-15-393.png\" alt=\"\" class=\"wp-image-12554 alignnone size-full\" width=\"1920\" height=\"1080\" srcset=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2017\/11\/Screenshot_2017-11-12-11-15-393.png 1920w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2017\/11\/Screenshot_2017-11-12-11-15-393-300x169.png 300w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2017\/11\/Screenshot_2017-11-12-11-15-393-768x432.png 768w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2017\/11\/Screenshot_2017-11-12-11-15-393-1024x576.png 1024w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I watched the YouTube video of&nbsp;Radiofun232 testing the PSO&nbsp;that he&nbsp;built according to the schematic he showed. &nbsp;I modified it somewhat. &nbsp;My objective was to decrease the frequency down to 400 Hz. I used three 0.1 uF capacitors and a 0.56 uF instead of the 0.47 uF. &nbsp;Instead of 1k I used 2.2k. &nbsp;I replaced the<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=12552\"> <\/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":[1],"tags":[],"class_list":["post-12552","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/12552","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=12552"}],"version-history":[{"count":5,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/12552\/revisions"}],"predecessor-version":[{"id":12569,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/12552\/revisions\/12569"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}