{"id":137,"date":"2016-05-02T10:29:11","date_gmt":"2016-05-02T15:29:11","guid":{"rendered":"http:\/\/kg5jbe.com\/?p=137"},"modified":"2016-05-02T10:29:11","modified_gmt":"2016-05-02T15:29:11","slug":"simple-lm386-op-amp","status":"publish","type":"post","link":"https:\/\/kg5jbe.com\/?p=137","title":{"rendered":"Simple LM386 Op Amp"},"content":{"rendered":"<p>I&#8217;ve been wanting to build myself a little amp for my phone, mp3 player, etc. for awhile. Originally, I wanted to build something completely from discrete components but finally gave into using the <a href=\"https:\/\/en.wikipedia.org\/wiki\/LM386\">LM386<\/a> IC. The <a href=\"http:\/\/www.ti.com\/lit\/ds\/symlink\/lm386.pdf\">datasheet<\/a> is very helpful and even includes several circuits to try out. It&#8217;s a very simple circuit to get the little amp built and working, but I kept having trouble with terrible distortion rendering the amp unusable. I kept tinkering, troubleshooting, researching, and so on, only to discover that one of the power rails on my breadboard is bad. Lame. Once I figured that out, then the circuit really <em>is<\/em> simple! You can find variations of this circuit all over the internet, but I ended up using the circuit from Dino over at <a href=\"http:\/\/hackaweek.com\/hacks\/?p=131\">Hack A Week<\/a>. This guy is pretty awesome and has very informative and entertaining instructional videos. His circuit and BOM is listed below.<\/p>\n<ul>\n<li>Enclosure of your choice<\/li>\n<li>10 ohm resistor<\/li>\n<li>10K potentiometer<\/li>\n<li>220 uf polarized capacitor<\/li>\n<li>100 uf polarized capacitor<\/li>\n<li>10 uf polarized capacitor<\/li>\n<li>.01 uf ceramic capacitor<\/li>\n<li>.047uf ceramic capacitor<\/li>\n<li>2x 1\/8\u2033 mini audio jacks<\/li>\n<li>2x 1\/4\u2033 audio jacks<\/li>\n<li>9 volt battery clip<\/li>\n<li>9 volt battery<\/li>\n<li>small perforated circuit board<\/li>\n<li>Some hookup wire<\/li>\n<li>A speaker of your choice for output.<\/li>\n<\/ul>\n<figure id=\"attachment_138\" class=\"thumbnail wp-caption alignnone\" style=\"width: 310px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-138\" src=\"http:\/\/kg5jbe.com\/wp-content\/uploads\/2016\/05\/LM386ampschematicfinal1-300x208.jpg\" alt=\"LM386 Op Amp from Hack A Week\" width=\"300\" height=\"208\" srcset=\"https:\/\/kg5jbe.com\/wp-content\/uploads\/2016\/05\/LM386ampschematicfinal1-300x208.jpg 300w, https:\/\/kg5jbe.com\/wp-content\/uploads\/2016\/05\/LM386ampschematicfinal1-768x533.jpg 768w, https:\/\/kg5jbe.com\/wp-content\/uploads\/2016\/05\/LM386ampschematicfinal1.jpg 1000w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption class=\"caption wp-caption-text\">LM386 Op Amp from Hack A Week<\/figcaption><\/figure>\n<p>A lot of the discrete parts for this project I salvaged from various things. I used my little <a href=\"http:\/\/www.amazon.com\/LEXPON-Multifunction-Transistor-Tester-Generator\/dp\/B00OLNRYQK?ie=UTF8&amp;psc=1&amp;redirect=true&amp;ref_=oh_aui_detailpage_o01_s00\">LEXPON Multifunction Transistor Tester<\/a> to test my components and to double check values on the capacitors. Dino&#8217;s BOM for the project is for a finished device, but you can skip a bunch of the items to just build it on a breadboard and get it working. I had a 10k pot with a built in on\/off switch that I used and I also wired in a little LED to remind me to turn off the circuit and not run down the battery. Using a salvaged 1w speaker plugged directly into the circuit on the breadboard, I got pretty clear audio from the output on my laptop. It&#8217;s always exciting to get stuff like this to work no matter how simple. Now to do something useful with it&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;ve been wanting to build myself a little amp for my phone, mp3 player, etc. for awhile. Originally, I wanted to build something completely from discrete components but finally gave into using the LM386 IC. The datasheet is very helpful and even includes several circuits to try out. It&#8217;s a very simple circuit to get [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,9],"tags":[17,24,32],"class_list":["post-137","post","type-post","status-publish","format-standard","hentry","category-electronics","category-homebrew","tag-amp","tag-electronics","tag-homebrew"],"_links":{"self":[{"href":"https:\/\/kg5jbe.com\/index.php?rest_route=\/wp\/v2\/posts\/137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kg5jbe.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kg5jbe.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kg5jbe.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kg5jbe.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=137"}],"version-history":[{"count":0,"href":"https:\/\/kg5jbe.com\/index.php?rest_route=\/wp\/v2\/posts\/137\/revisions"}],"wp:attachment":[{"href":"https:\/\/kg5jbe.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kg5jbe.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kg5jbe.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}