{"id":2984,"date":"2015-10-07T00:12:54","date_gmt":"2015-10-07T00:12:54","guid":{"rendered":"http:\/\/41j.com\/blog\/?p=2984"},"modified":"2015-10-07T00:12:54","modified_gmt":"2015-10-07T00:12:54","slug":"photodiode-amplifiers-transimpedance","status":"publish","type":"post","link":"https:\/\/41j.com\/blog\/2015\/10\/photodiode-amplifiers-transimpedance\/","title":{"rendered":"Photodiode Amplifiers (Transimpedance)"},"content":{"rendered":"<p><a href=\"http:\/\/41j.com\/blog\/2015\/10\/photodiode-amplifiers-transimpedance\/photoarray\/\" rel=\"attachment wp-att-2987\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/10\/photoarray.png\" alt=\"photoarray\" width=\"437\" height=\"500\" class=\"aligncenter size-full wp-image-2987\" \/><\/a><\/p>\n<p>Today I&#8217;ve been playing with Photodiodes and transimpedance amplifiers. The video below describes the circuit I&#8217;ve been playing with:<\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/bDdIwGi8sgE\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>It&#8217;s a very straight forward TIA circuit using an LM741. The 741 is almost certainly not a good opamp for this application, but it seems to work reasonably well here. I also laid out 9 photodiodes on a board using a similar circuit. When I come to build them up I may not use the 741, but another opamp with a similar pinout (possibly FET input). The basic TIA circuit and the build is shown below.<\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/2015\/10\/photodiode-amplifiers-transimpedance\/photo-11-8\/\" rel=\"attachment wp-att-2985\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/10\/photo-11.jpg\" alt=\"photo 1(1)\" width=\"1632\" height=\"1224\" class=\"aligncenter size-full wp-image-2985\" \/><\/a><\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/2015\/10\/photodiode-amplifiers-transimpedance\/photo-22-4\/\" rel=\"attachment wp-att-2986\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/10\/photo-22.jpg\" alt=\"photo 2(2)\" width=\"1632\" height=\"1224\" class=\"aligncenter size-full wp-image-2986\" \/><\/a><\/p>\n<p>Kicad files\/Gerbers: <a href=\"http:\/\/41j.com\/blog\/2015\/10\/photodiode-amplifiers-transimpedance\/photodiode-tar\/\" rel=\"attachment wp-att-2988\">photodiode.tar<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today I&#8217;ve been playing with Photodiodes and transimpedance amplifiers. The video below describes the circuit I&#8217;ve been playing with: It&#8217;s a very straight forward TIA circuit using an LM741. The 741 is almost certainly not a good opamp for this application, but it seems to work reasonably well here. I also laid out 9 photodiodes [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","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-2984","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-M8","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2984","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=2984"}],"version-history":[{"count":2,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2984\/revisions"}],"predecessor-version":[{"id":2990,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2984\/revisions\/2990"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=2984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=2984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=2984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}