{"id":2991,"date":"2015-10-07T22:46:27","date_gmt":"2015-10-07T22:46:27","guid":{"rendered":"http:\/\/41j.com\/blog\/?p=2991"},"modified":"2015-10-07T22:46:27","modified_gmt":"2015-10-07T22:46:27","slug":"playing-with-an-electret-mic","status":"publish","type":"post","link":"https:\/\/41j.com\/blog\/2015\/10\/playing-with-an-electret-mic\/","title":{"rendered":"Playing with an Electret Mic"},"content":{"rendered":"<p><a href=\"http:\/\/41j.com\/blog\/2015\/10\/playing-with-an-electret-mic\/photo-23-2\/\" rel=\"attachment wp-att-2992\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/10\/photo-23.jpg\" alt=\"photo 2(3)\" width=\"1632\" height=\"1224\" class=\"aligncenter size-full wp-image-2992\" \/><\/a><\/p>\n<p>Today I was playing with an Electret mic, salvaged from a bluetooth handsfree kit. I&#8217;ve not used a Electret mic before so it&#8217;s operation\/preamp was of interest to me. It seems that most of these mics now include a single JFET common source amplifer in the mic can itself. As such they just need a single resistor and some biasing and they&#8217;re ready to go. The pic above shows the Mic internals.<\/p>\n<p>In the video below I play with the Mic a bit and run a tone generator against the mic and show an FFT on my scope. A fun 5 minute project if nothing else&#8230;<\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/d3aDCIL3tNU\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today I was playing with an Electret mic, salvaged from a bluetooth handsfree kit. I&#8217;ve not used a Electret mic before so it&#8217;s operation\/preamp was of interest to me. It seems that most of these mics now include a single JFET common source amplifer in the mic can itself. As such they just need a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-2991","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-Mf","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=2991"}],"version-history":[{"count":2,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2991\/revisions"}],"predecessor-version":[{"id":2994,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2991\/revisions\/2994"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=2991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=2991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=2991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}