{"id":341,"date":"2014-06-06T18:09:15","date_gmt":"2014-06-06T18:09:15","guid":{"rendered":"http:\/\/www.thinkering.de\/cms\/?p=341"},"modified":"2017-02-23T08:14:31","modified_gmt":"2017-02-23T08:14:31","slug":"341","status":"publish","type":"post","link":"http:\/\/www.thinkering.de\/cms\/?p=341","title":{"rendered":"Simple ECG\/EEG\/EMG amplifier"},"content":{"rendered":"<p><a href=\"http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/20131207_195952.jpg\"><img loading=\"lazy\" src=\"http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/20131207_195952-300x225.jpg\" alt=\"20131207_195952\" width=\"300\" height=\"225\" class=\"alignnone size-medium wp-image-343\" srcset=\"http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/20131207_195952-300x225.jpg 300w, http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/20131207_195952-1024x768.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\nI&#8217;ve been experimenting with electrophysiology for some time and therefore the need to better understand the amplifier circuitry arose. I sampled some INA321 instrumentation amplifiers from Texas Instruments and started experimenting. After soldering them to a breakout board you can breadboard them.<br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\nThe simple setup below can readily be attached to an analog to digital converter of a microcontroller and to 3 skin electrodes wherever you like to attach them \ud83d\ude09<br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\nBesides the instrumentation amp (chip on the left) only one additional dual low-noise opamp is used, which implements a buffer for reference voltage and a bessel filter for reducing mains line interference.<br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><\/p>\n<p>Eagle schmatic:<br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<br style=\u201dclear:both;\u201d \/><br \/>\n<a href=\"http:\/\/www.thinkering.de\/cms\/wp-content\/uploads\/2014\/06\/simplestEEG.zip\">simplestEEG<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;ve been experimenting with electrophysiology for some time and therefore the need to better understand the amplifier circuitry arose. I sampled some INA321 instrumentation amplifiers from Texas Instruments and started experimenting. After soldering them to a breakout board you can breadboard them. The simple setup below can readily be attached to an analog to digital &hellip; <a href=\"http:\/\/www.thinkering.de\/cms\/?p=341\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Simple ECG\/EEG\/EMG amplifier<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[1,10],"tags":[],"_links":{"self":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts\/341"}],"collection":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=341"}],"version-history":[{"count":4,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts\/341\/revisions"}],"predecessor-version":[{"id":911,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=\/wp\/v2\/posts\/341\/revisions\/911"}],"wp:attachment":[{"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=341"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.thinkering.de\/cms\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}