{"id":120,"date":"2014-11-28T13:50:25","date_gmt":"2014-11-28T11:50:25","guid":{"rendered":"http:\/\/atwrk.phae.eu\/?p=120"},"modified":"2014-12-03T03:59:25","modified_gmt":"2014-12-03T01:59:25","slug":"circuit-electret-symetrique-alim-phantom-p48","status":"publish","type":"post","link":"https:\/\/atwrk.phae.eu\/?p=120","title":{"rendered":"circuit Electret sym\u00e9trique \/ alim Phantom P48"},"content":{"rendered":"<p>R\u00e9alisation du circuit interfa\u00e7ant une capsule \u00e9lectret vers une entr\u00e9e de pr\u00e9ampli micro sym\u00e9trique et fournissant une alimentation Phantom en +48V.<!--more-->Sch\u00e9ma trouv\u00e9 : <a href=\"http:\/\/www.epanorama.net\/circuits\/microphone_powering.html\">http:\/\/www.epanorama.net\/circuits\/microphone_powering.html<\/a><\/p>\n<p>adapt\u00e9 depuis les PZM mods (modification d&rsquo;un micro \u00ab\u00a0de surface\u00a0\u00bb) par Christopher Hick : <a href=\"http:\/\/www.uneeda-audio.com\/pzm\/pzm_ch.htm\">http:\/\/www.uneeda-audio.com\/pzm\/pzm_ch.htm<\/a><a href=\"https:\/\/atwrk.phae.eu\/wp-content\/uploads\/2014\/11\/electret_xlr1.gif\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-122\" src=\"https:\/\/atwrk.phae.eu\/wp-content\/uploads\/2014\/11\/electret_xlr1-500x264.gif\" alt=\"electret_xlr1\" width=\"500\" height=\"264\" \/><\/a><\/p>\n<p>Relativement \u00e0 la qualit\u00e9 de la capsule (rapport S\/N ~ 50db max), \u00e7a marche plut\u00f4t bien. Peu de parasites sur un cordon sym\u00e9trique 15m. Peut-\u00eatre quand m\u00eame une une petite boucle de masse qui fait un hum ?<\/p>\n<p>Ou bien c&rsquo;est une mauvaise r\u00e9jection des fr\u00e9quences radio (buzz intermittent dans les aigus), ou bien les deux signaux inverses sont mal appair\u00e9s (r\u00e9sistances de tol\u00e9rance 5%).<\/p>\n<p>Certains composants sont chers et\/ou difficiles \u00e0 trouver. Par exemple les condensateurs \u00ab\u00a0plastic film\u00a0\u00bb. Me pose aussi la question de l&rsquo;intensit\u00e9\/puissance que doivent accepter les r\u00e9sistances. J&rsquo;ai mis des 1\/4W et des 0,6W pour certaines qui doivent \u00eatre pr\u00e9cises (tol\u00e9rance 1%), et \u00e7a n&rsquo;a pas l&rsquo;air de poser probl\u00e8me.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R\u00e9alisation du circuit interfa\u00e7ant une capsule \u00e9lectret vers une entr\u00e9e de pr\u00e9ampli micro sym\u00e9trique et fournissant une alimentation Phantom en +48V.<\/p>\n","protected":false},"author":1,"featured_media":123,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[39,62,90],"tags":[68,93,91,69,92,42],"_links":{"self":[{"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=\/wp\/v2\/posts\/120"}],"collection":[{"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=120"}],"version-history":[{"count":3,"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=\/wp\/v2\/posts\/120\/revisions"}],"predecessor-version":[{"id":174,"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=\/wp\/v2\/posts\/120\/revisions\/174"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=\/wp\/v2\/media\/123"}],"wp:attachment":[{"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=120"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=120"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/atwrk.phae.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}