{"id":1286,"date":"2014-08-23T02:55:56","date_gmt":"2014-08-23T02:55:56","guid":{"rendered":"http:\/\/41j.com\/blog\/?p=1286"},"modified":"2015-03-03T03:11:08","modified_gmt":"2015-03-03T03:11:08","slug":"lm1117-notes","status":"publish","type":"post","link":"https:\/\/41j.com\/blog\/2014\/08\/lm1117-notes\/","title":{"rendered":"LM1117 notes"},"content":{"rendered":"<p>I pulled some LM1117 voltage regulators from a bunch of routers. I want to use them in another project so I knocked together a quick circuit to test them. Here is the basic LM1117 schematic:<\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117.png\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117.png\" alt=\"lm1117\" width=\"406\" height=\"335\" class=\"aligncenter size-full wp-image-1287\" srcset=\"https:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117.png 406w, https:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117-300x247.png 300w\" sizes=\"auto, (max-width: 406px) 100vw, 406px\" \/><\/a><\/p>\n<p>And here it is built up, using mostly random parts from my junk bin. R1 is 200Ohm, R2 is a 1K pot in series with a 200Ohm. The cap is 100uF. I should probably also have a cap on the input, but I&#8217;m running this from a bench supply and it seems fine.<\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117made.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117made-1024x818.jpg\" alt=\"lm1117made\" width=\"700\" height=\"559\" class=\"aligncenter size-large wp-image-1288\" srcset=\"https:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117made-1024x818.jpg 1024w, https:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117made-300x239.jpg 300w, https:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/lm1117made.jpg 1310w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n<p>The LM1117 is used in a number of applications are a jelly bean variable regular, I&#8217;ve seen it typically used as a 1.2 or 3.3v regulator. There&#8217;s an interesting application note on this application <a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2014\/08\/HuanLin480ApplicationNote.pdf\">here<\/a>.<\/p>\n<p>You can find the datasheet, and some design notes for this part at the end of the post <a href=\"http:\/\/41j.com\/blog\/2014\/08\/a-bare-rt3050-pcb\/\">here<\/a> were it&#8217;s used in a RT3050 PCB I was reverse engineering as a 3.3v regulator.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I pulled some LM1117 voltage regulators from a bunch of routers. I want to use them in another project so I knocked together a quick circuit to test them. Here is the basic LM1117 schematic: And here it is built up, using mostly random parts from my junk bin. R1 is 200Ohm, R2 is a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-1286","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-kK","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/1286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=1286"}],"version-history":[{"count":3,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/1286\/revisions"}],"predecessor-version":[{"id":2144,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/1286\/revisions\/2144"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=1286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=1286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=1286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}