{"id":468,"date":"2019-09-02T00:51:32","date_gmt":"2019-09-02T00:51:32","guid":{"rendered":"https:\/\/delphijustin.biz\/?p=468"},"modified":"2020-02-11T18:39:31","modified_gmt":"2020-02-12T00:39:31","slug":"nimh-and-nicd-battery-charger","status":"publish","type":"post","link":"https:\/\/delphijustin.biz\/nimh-and-nicd-battery-charger\/","title":{"rendered":"NiMH and NiCD battery charger"},"content":{"rendered":"\n<p>Here is a simple transistor battery charger it can charge batteries up to 12v in series. It has an LED and a few parts.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" loading=\"lazy\" width=\"262\" height=\"288\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2019\/09\/battery-charger-1.gif\" alt=\"\" class=\"wp-image-474\"\/><figcaption>Circuit<\/figcaption><\/figure>\n\n\n\n<p>To use it you must decide on a power supply voltage,  current limit resistor, and <g class=\"gr_ gr_8 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar only-ins doubleReplace replaceWithoutSep\" id=\"8\" data-gr-id=\"8\">number<\/g> of cells. First to figure out what voltage to use you must know the total battery series voltage. Batteries in series their voltages <g class=\"gr_ gr_9 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar multiReplace\" id=\"9\" data-gr-id=\"9\">adds<\/g> up.<\/p>\n\n\n\n<table class=\"wp-block-table\"><tbody><tr><td>Battery series voltage(B1)<\/td><td>minimum(V1)<\/td><td>maximum(V1)<\/td><\/tr><tr><td>1.2v<\/td><td>6.5v<\/td><td>10v<\/td><\/tr><tr><td>2.4v<\/td><td>7.5v<\/td><td>11v<\/td><\/tr><tr><td>3.6v<\/td><td>9.6v<\/td><td>12v<\/td><\/tr><tr><td>4.8v<\/td><td>10.5v<\/td><td>13v<\/td><\/tr><tr><td>6v<\/td><td>12<\/td><td>15v<\/td><\/tr><tr><td>7.2v<\/td><td>13.2v<\/td><td>16v<\/td><\/tr><tr><td>8.4v<\/td><td>14.5v<\/td><td>18v<\/td><\/tr><tr><td>9.6v<\/td><td>15.6v<\/td><td>18v<\/td><\/tr><tr><td>10.8v<\/td><td>16.8v<\/td><td>19v<\/td><\/tr><tr><td>12v<\/td><td>18v<\/td><td>21v<\/td><\/tr><\/tbody><\/table>\n\n\n\n<p>Just pick a number of batteries in series that matches its output voltage. The power supply voltage must not go below minimum voltage or over the maximum voltage(as seen in the table above)<\/p>\n\n\n\n<p>Now that we figured power supply voltage and battery count we must figure out the current limit resistor(R2). This charger will take 15 hours to charge. To figure out we need to know amp-hour of one battery. All batteries must have the same amp-hour rating. The current should be limited to ten times less than the amp-hour rating. So if it is 1000mAh the resistor should limit it to 100mA.<\/p>\n\n\n\nAmp-Hour rating:<input id=\"ah\" value=\"1000\" type=\"number\">mAh<br>\nThe calculated times small should be close to 10.<br>\n<div id=\"result\"><\/div>\n<input value=\"Calculate\" onclick=\"calc()\" type=\"button\">\n<script>\nvar a=0;\nb=0;\nconst rx=[{r:47,ah:50},{ah:100,r:18},{ah:200,r:6.8},{ah:300,r:39},{ah:400,r:27}];\nfunction enumResistor(item, index){\nif(a>=item.ah){document.getElementById(\"result\").innerHTML=\"Current:\"+a+\"<br>Times Smaller:\"+Number(document.getElementById(\"ah\").value\/item.ah)+\"<br>Resistance:\"+item.r+\" ohms 1\/4W<br>Battery voltage:\"+Number(b);}\n}\nfunction calc(){\na=document.getElementById(\"ah\").value\/10;\nrx.forEach(enumResistor);\n}\n<\/script>\n\n\n\n<p>To use more than 10 cells multiply the number of parts.  D1 is a standard 1A or higher rectifier diode. The charger should be turned off when it is done charger. The LED should change its state. Also, currents add up. The circuit originally came from <a href=\"http:\/\/electronicsyard.blogspot.com\/2013\/09\/nicd-nimh-battery-charger-circuit.html\">ElectronicsYard<\/a><\/p>\n\n\n\n<script type=\"text\/javascript\" src=\"\/\/delphianserver.com\/counter\/ibuiltit.js\"><\/script>\n","protected":false},"excerpt":{"rendered":"<p>Here is a simple transistor battery charger it can charge batteries up to 12v in series. It has an LED and a few parts. To use it you must decide on a power supply voltage, current limit resistor, and number of cells. First to figure out what voltage to use you must know the total &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/delphijustin.biz\/nimh-and-nicd-battery-charger\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;NiMH and NiCD battery charger&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"beyondwords_generate_audio":"","beyondwords_project_id":"","beyondwords_content_id":"","beyondwords_preview_token":"","beyondwords_player_style":"","beyondwords_language_id":"","beyondwords_title_voice_id":"","beyondwords_body_voice_id":"","beyondwords_summary_voice_id":"","beyondwords_error_message":"","beyondwords_disabled":"","beyondwords_delete_content":"","beyondwords_podcast_id":"","beyondwords_hash":"","publish_post_to_speechkit":"","speechkit_hash":"","speechkit_generate_audio":"","speechkit_project_id":"","speechkit_podcast_id":"","speechkit_error_message":"","speechkit_disabled":"","speechkit_access_key":"","speechkit_error":"","speechkit_info":"","speechkit_response":"","speechkit_retries":"","speechkit_status":"","speechkit_updated_at":"","_speechkit_link":"","_speechkit_text":""},"categories":[2],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/468"}],"collection":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/comments?post=468"}],"version-history":[{"count":5,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/468\/revisions"}],"predecessor-version":[{"id":972,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/468\/revisions\/972"}],"wp:attachment":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/media?parent=468"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/categories?post=468"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/tags?post=468"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}