{"id":215,"date":"2011-11-29T04:06:50","date_gmt":"2011-11-29T04:06:50","guid":{"rendered":"http:\/\/afrotechmods.com\/tutorials\/?p=215"},"modified":"2020-05-28T19:31:58","modified_gmt":"2020-05-28T19:31:58","slug":"how-to-turn-an-old-ups-into-an-alkaline-battery-charger","status":"publish","type":"post","link":"https:\/\/afrotechmods.com\/tutorials\/2011\/11\/29\/how-to-turn-an-old-ups-into-an-alkaline-battery-charger\/","title":{"rendered":"How to Turn an Old UPS into an Alkaline Battery Charger!"},"content":{"rendered":"<p>I recently lost my collection of electronic components, and was looking for a cheap source of parts I could use in my projects. It turns out that my old, broken uninterruptible power supply was a goldmine of useful components! Check out the video to see what I found inside. It turns out that I had everything I needed to build a battery charger, an audio amplifier, a variable power supply and more.<\/p>\n<style>.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }<\/style>\n<div class=\"embed-container\"><iframe src=\"https:\/\/www.youtube.com\/embed\/YzrKIYNPn4o\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\" frameborder=\"0\"><\/iframe><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-786\" src=\"http:\/\/afrotechmods.com\/tutorials\/wp-content\/uploads\/2011\/11\/circuit.jpg\" alt=\"alkaline battery charging circuit\" width=\"604\" height=\"216\" srcset=\"https:\/\/afrotechmods.com\/tutorials\/wp-content\/uploads\/2011\/11\/circuit.jpg 604w, https:\/\/afrotechmods.com\/tutorials\/wp-content\/uploads\/2011\/11\/circuit-300x107.jpg 300w\" sizes=\"auto, (max-width: 604px) 100vw, 604px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-787\" src=\"http:\/\/afrotechmods.com\/tutorials\/wp-content\/uploads\/2011\/11\/LM317.jpg\" alt=\"LM317\" width=\"203\" height=\"348\" srcset=\"https:\/\/afrotechmods.com\/tutorials\/wp-content\/uploads\/2011\/11\/LM317.jpg 257w, https:\/\/afrotechmods.com\/tutorials\/wp-content\/uploads\/2011\/11\/LM317-175x300.jpg 175w\" sizes=\"auto, (max-width: 203px) 100vw, 203px\" \/><\/p>\n<p>The charging current = 1.25V \/ R<br \/>\nFor example, I found that the 3 fuses put in series gave me a resistance of roughly 7 ohms. 1.25 \/ 7 = 178mA. So the battery would charge with a current of approximately 178mA.<\/p>\n<p><a href=\"http:\/\/www.afrotechmods.com\/reallycheap\/UPS\/LM317.pdf\">The full datasheet for the LM317T can be found here<\/a>. It contains lots of nifty example circuits. The charger circuit can be seen on page 10.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I recently lost my collection of electronic components, and was looking for a cheap source of parts I could use in my projects. It turns out that my old, broken uninterruptible power supply was a goldmine of useful components! Check out the video to see what I found inside. It turns out that I had [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":771,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[64,38,41,21],"class_list":["post-215","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-intermediate-tutorials","tag-alkaline","tag-batteries","tag-battery-charging","tag-lm317"],"acf":[],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/afrotechmods.com\/tutorials\/wp-content\/uploads\/2011\/11\/UPS332x187.jpg","_links":{"self":[{"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/comments?post=215"}],"version-history":[{"count":10,"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/posts\/215\/revisions"}],"predecessor-version":[{"id":1319,"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/posts\/215\/revisions\/1319"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/media\/771"}],"wp:attachment":[{"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/media?parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/categories?post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afrotechmods.com\/tutorials\/wp-json\/wp\/v2\/tags?post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}