{"id":550,"date":"2016-05-31T23:03:00","date_gmt":"2016-05-31T23:03:00","guid":{"rendered":"http:\/\/eportfolios.macaulay.cuny.edu\/rrahman\/?p=390"},"modified":"2016-05-31T23:03:00","modified_gmt":"2016-05-31T23:03:00","slug":"redesigning-the-power-circuit-for-a-bluetooth-speaker","status":"publish","type":"post","link":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/2016\/05\/31\/redesigning-the-power-circuit-for-a-bluetooth-speaker\/","title":{"rendered":"Redesigning the Power Circuit for a Bluetooth Speaker"},"content":{"rendered":"

This project was born out of necessity. My Bluetooth\u00a0speaker stopped working all on a sudden. I opened up the speaker, found the PCB and noticed that the 5V DC jack is broken and as a result, it’s not charging anymore.<\/p>\n

I spent some time studying the PCB, tracing the PCB routes and realized that the DC jack was designed to get power from a continuous supply and it charges a 3.7V(1200 mAh) Li-Po battery. The battery is then connected to all the components on the printed circuit board.\u00a0I decided to remove the battery, extend the power wires from the speaker and directly solder them to a 5V continuous DC supply. Although the speaker lost its portability due to this redesigned model of the power circuit, I was able to fix it without buying any additional component. Plus, my use of the speaker is almost always stationary.<\/p>\n

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Image: exposed PCB after opening the speaker\u00a0<\/strong><\/p>\n

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Broken DC Jack<\/strong><\/figcaption><\/figure>\n
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TESTING MY SOLUTION WITH A BREADBOARD PROTOTYPE. I ALSO FOUND OUT THE MINIMUM AND MAXIMUM VOLTAGE I CAN SUPPLY SAFELY.<\/strong><\/figcaption><\/figure>\n

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REDESIGNED POWER CIRCUIT WITH A DIRECT 5V CONNECTION (MANUALLY SOLDERED)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/strong><\/figcaption><\/figure>\n
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FINAL WORKING VERSION OF THE SPEAKER<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

This project was born out of necessity. My Bluetooth\u00a0speaker stopped working all on a sudden. I opened up the speaker, found the PCB and noticed that the 5V DC jack is broken and as a result, it’s not charging anymore. I spent some time studying the PCB, tracing the PCB routes and realized that the […]<\/p>\n","protected":false},"author":605,"featured_media":382,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"portfolio_post_id":0,"portfolio_citation":"","portfolio_annotation":"","openlab_post_visibility":"","footnotes":""},"categories":[4],"tags":[],"class_list":["post-550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardware-projects"],"_links":{"self":[{"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/posts\/550","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/users\/605"}],"replies":[{"embeddable":true,"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/comments?post=550"}],"version-history":[{"count":0,"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/posts\/550\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/media\/382"}],"wp:attachment":[{"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/media?parent=550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/categories?post=550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/openlab.macaulay.cuny.edu\/reazwrahman\/wp-json\/wp\/v2\/tags?post=550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}