{"id":9301,"date":"2020-06-26T22:07:32","date_gmt":"2020-06-26T22:07:32","guid":{"rendered":"https:\/\/stevepedwards.today\/stevepedwards.com\/ElectronicsStuff\/?p=9301"},"modified":"2020-08-14T17:26:23","modified_gmt":"2020-08-14T16:26:23","slug":"mr-carlsons-lab-1khz-wien-bridge-oscillator","status":"publish","type":"post","link":"https:\/\/stevepedwards.today\/ElectronicsStuff\/mr-carlsons-lab-1khz-wien-bridge-oscillator\/","title":{"rendered":"Mr Carlson&#8217;s Lab &#8211; 1kHz Wien Bridge Oscillator"},"content":{"rendered":"<p><iframe loading=\"lazy\" title=\"Low Distortion Audio Signal Generator\" width=\"1778\" height=\"1000\" src=\"https:\/\/www.youtube.com\/embed\/QOeuA2SO8ZU?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<p>Lots of attempts getting this to work with a car bulb, then got a small 36 ohm 12V panel bulb in a box of bits, which finally burst into life using an LM358N op amp, not Carlson's TLO72 op amp.<\/p>\n<p>Mine worked without the trim pot from ground to pin 3 - a 1k5 only worked. The bulb is just lit.<\/p>\n<p>I then soldered it to perf board, and it ran at 1kHz spot on, 20Vpp out - so no need to add the other amp pair in the LM358N package just yet.<\/p>\n<p>Added 2nd amp = Hi Z in, 100% feedback, low Z out 1:1<\/p>\n<p><iframe loading=\"lazy\" title=\"Mr Carlson Wien Oscillator with Low Z 20V ,1 kHz Sine Out\" width=\"1333\" height=\"1000\" src=\"https:\/\/www.youtube.com\/embed\/jil2FTWp-lQ?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>Lots of attempts getting this to work with a car bulb, then got a small 36 ohm 12V panel bulb in a box of bits, which finally burst into life using an LM358N op amp, not Carlson's TLO72 op amp. Mine worked without the trim pot from ground to pin 3 - a 1k5 only <a href=\"https:\/\/stevepedwards.today\/ElectronicsStuff\/mr-carlsons-lab-1khz-wien-bridge-oscillator\/\" class=\"more-link\">...<span class=\"screen-reader-text\">  Mr Carlson&#8217;s Lab &#8211; 1kHz Wien Bridge Oscillator<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-9301","post","type-post","status-publish","format-standard","hentry","category-tech-studies"],"_links":{"self":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/9301","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/comments?post=9301"}],"version-history":[{"count":5,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/9301\/revisions"}],"predecessor-version":[{"id":9454,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/9301\/revisions\/9454"}],"wp:attachment":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/media?parent=9301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/categories?post=9301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/tags?post=9301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}