{"id":8925,"date":"2019-09-22T19:26:50","date_gmt":"2019-09-22T19:26:50","guid":{"rendered":"https:\/\/stevepedwards.today\/stevepedwards.com\/ElectronicsStuff\/?p=8925"},"modified":"2019-09-22T19:26:50","modified_gmt":"2019-09-22T19:26:50","slug":"vco","status":"publish","type":"post","link":"https:\/\/stevepedwards.today\/ElectronicsStuff\/vco\/","title":{"rendered":"LM358 VCO Circuit"},"content":{"rendered":"<p>This isn't clear for beginners, but V\/2 at pin 5 non-inverting input of amp 2 means you have to add another 2 x say, 10k resistors as a voltage divider to supply the correct voltage at pin 5 - NOT the full PSU voltage (5V) as I did at first - else it won't work.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-8927\" src=\"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2019\/09\/lm2904vco-1.png\" alt=\"\" width=\"624\" height=\"359\" srcset=\"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2019\/09\/lm2904vco-1.png 624w, https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2019\/09\/lm2904vco-1-300x173.png 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><br \/>\nThe pin 5 100k\/51k resistors are the feedback, not the voltage dividers..duh!<br \/>\nWith a 47uF cap at pins 1-2 I get the correct outputs:<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-8930\" src=\"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2019\/09\/vcolm358.png\" alt=\"\" width=\"855\" height=\"471\" srcset=\"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2019\/09\/vcolm358.png 855w, https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2019\/09\/vcolm358-300x165.png 300w, https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2019\/09\/vcolm358-768x423.png 768w\" sizes=\"auto, (max-width: 855px) 100vw, 855px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This isn't clear for beginners, but V\/2 at pin 5 non-inverting input of amp 2 means you have to add another 2 x say, 10k resistors as a voltage divider to supply the correct voltage at pin 5 - NOT the full PSU voltage (5V) as I did at first - else it won't work. <a href=\"https:\/\/stevepedwards.today\/ElectronicsStuff\/vco\/\" class=\"more-link\">...<span class=\"screen-reader-text\">  LM358 VCO Circuit<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,2],"tags":[],"class_list":["post-8925","post","type-post","status-publish","format-standard","hentry","category-tech-studies","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/8925","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=8925"}],"version-history":[{"count":0,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/8925\/revisions"}],"wp:attachment":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/media?parent=8925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/categories?post=8925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/tags?post=8925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}