{"id":49,"date":"2014-05-05T19:23:29","date_gmt":"2014-05-05T19:23:29","guid":{"rendered":"http:\/\/daqdesign.wordpress.com\/?p=49"},"modified":"2024-10-23T20:47:36","modified_gmt":"2024-10-23T20:47:36","slug":"current-limiting-an-led","status":"publish","type":"post","link":"https:\/\/daq-design.co.uk\/blog\/?p=49","title":{"rendered":"Current Limiting an LED"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">LEDs are great devices, small, very bright, efficient run cold and easy to use. They are quite hardy too, with one exception: excessive forward current. Forward WHAT? Sorry, if you don&#8217;t limit te current flowing through the LED it will smoke and die. It could also damage your output circuit too. So how do we limit the current? Simple a series resistor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How to select a resistor.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is a simple ohm&#8217;s law calculation and a data sheet lookup for your LED. If you don&#8217;t have the data sheet \u00a0you can make a basic assumption that the voltage potential difference between the anode and cathode of approximately 2V. LEDs also have a maximum forward current Iforward of between 10-20mA. The more current, the harder the LED will be driven.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"270\" height=\"36\" src=\"https:\/\/daq-design.co.uk\/blog\/wp-content\/uploads\/2024\/10\/render.gif\" alt=\"\" class=\"wp-image-418\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Don&#8217;t forget about power dissipation:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"23\" src=\"https:\/\/daq-design.co.uk\/blog\/wp-content\/uploads\/2024\/10\/codecogseqn-12-300x23.gif\" alt=\"\" class=\"wp-image-420\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">so a 0.125Watt resistor will be fine.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LEDs are great devices, small, very bright, efficient run cold and easy to use. They are quite hardy too, with one exception: excessive forward current. Forward WHAT? Sorry, if you don&#8217;t limit te current flowing through the LED it will &hellip; <a href=\"https:\/\/daq-design.co.uk\/blog\/?p=49\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-49","post","type-post","status-publish","format-standard","hentry","category-transistors"],"_links":{"self":[{"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/49","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=49"}],"version-history":[{"count":3,"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/49\/revisions"}],"predecessor-version":[{"id":476,"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/49\/revisions\/476"}],"wp:attachment":[{"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=49"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=49"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/daq-design.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=49"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}