{"id":121,"date":"2011-11-10T22:20:51","date_gmt":"2011-11-10T22:20:51","guid":{"rendered":"http:\/\/www.andrewwhyman.com\/blog\/?p=121"},"modified":"2011-11-10T22:20:51","modified_gmt":"2011-11-10T22:20:51","slug":"lm7805-5v-regulator-for-usb-phone-charging-prototype-1","status":"publish","type":"post","link":"http:\/\/www.andrewwhyman.com\/blog\/electronics\/lm7805-5v-regulator-for-usb-phone-charging-prototype-1\/","title":{"rendered":"LM7805 5v Regulator For USB Phone Charging &#8211; Prototype 1"},"content":{"rendered":"<p>Right! Now that I have finally solved the issue on the charging here is prototype 1 of the circuit.<\/p>\n<p>It uses 2 voltage dividers to give 2.0v to D- and 2.8v to D+, which allows smart(er) phones to take a high current. 1A should be allowed with this setup. If you want 500mA maximum, set D+ to 2.0v just as D- is.<\/p>\n<p><em><strong>Note:<\/strong> The smoothing capacitors have been excluded from this circuit but will be included in the final design. 470uF on the regulator input, 330uF and 100nF on the output of the regulator.<\/em><\/p>\n<div style=\"text-align: center; width: 100%; margin: 10px;\">\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/Working-Prototype-1-circuit-diagram.png\" alt=\"Working Prototype 1 circuit diagram\" title=\"Working Prototype 1 circuit diagram\" width=\"327\" height=\"482\" class=\"aligncenter size-full wp-image-122\" srcset=\"http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/Working-Prototype-1-circuit-diagram.png 327w, http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/Working-Prototype-1-circuit-diagram-203x300.png 203w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/Working-Prototype-1-e1320962747866.jpg\" alt=\"Working Prototype 1\" title=\"Working Prototype 1\" width=\"600\" height=\"450\" class=\"aligncenter size-full wp-image-123\" \/><\/p>\n<p>The meter is connected to the output of the regulator so it shows the current flowing to the phone.<br \/>\n<a href=\"http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/IMG_03051.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/IMG_03051-768x1024.jpg\" alt=\"Charging proof\" title=\"Charging proof\" width=\"600\" height=\"800\" class=\"aligncenter size-large wp-image-136\" srcset=\"http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/IMG_03051-768x1024.jpg 768w, http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/IMG_03051-225x300.jpg 225w, http:\/\/www.andrewwhyman.com\/blog\/wp-content\/uploads\/2011\/11\/IMG_03051.jpg 1728w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Right! Now that I have finally solved the issue on the charging here is prototype 1 of the circuit. It uses 2 voltage dividers to give 2.0v to D- and 2.8v to D+, which allows smart(er) phones to take a high current. 1A should be allowed with this setup. If you want 500mA maximum, set [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"amp_status":"","footnotes":""},"categories":[14],"tags":[21,20],"class_list":["post-121","post","type-post","status-publish","format-standard","hentry","category-electronics","tag-5v-regulator","tag-lm7805"],"_links":{"self":[{"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/posts\/121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/comments?post=121"}],"version-history":[{"count":14,"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/posts\/121\/revisions"}],"predecessor-version":[{"id":139,"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/posts\/121\/revisions\/139"}],"wp:attachment":[{"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/media?parent=121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/categories?post=121"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.andrewwhyman.com\/blog\/wp-json\/wp\/v2\/tags?post=121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}