{"id":3028,"date":"2012-06-04T07:42:13","date_gmt":"2012-06-04T14:42:13","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=3028"},"modified":"2012-08-14T21:41:22","modified_gmt":"2012-08-15T04:41:22","slug":"2012-06-04","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=3028","title":{"rendered":"2012-06-04 Watson&#8217;s Amplified Earphone"},"content":{"rendered":"<p><a href=\"http:\/\/rustybolt.info\/wordpress\/?attachment_id=3678\" rel=\"attachment wp-att-3678\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-3678\" title=\"AmplEarph3260\" src=\"http:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/06\/AmplEarph3260-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/06\/AmplEarph3260-300x225.jpg 300w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/06\/AmplEarph3260.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>This picture was dated Oct 2002 so I had already built it and put it into service by then.\u00a0 I took the handset of an old phone, and sawed off the handle and microphone, leaving just the part that holds the earphone. \u00a0 I built the circuit on a piece of perfboard and installed it in the back cover of the earphone enclosure, and mounted the AA cell holder to the outside &#8211; you can see where the black battery wire goes through a hole and then back behind.\u00a0 The electret microphone seen close and to the right plugged into the black jack next to it. \u00a0 For the switch I just folded up a small square of paper and put it between the positive end of the battery and the holder.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/rustybolt.info\/wordpress\/?attachment_id=3679\" rel=\"attachment wp-att-3679\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-3679\" title=\"AmplEarph3262S3\" src=\"http:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/06\/AmplEarph3262S3-300x178.gif\" alt=\"\" width=\"300\" height=\"178\" srcset=\"https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/06\/AmplEarph3262S3-300x178.gif 300w, https:\/\/rustybolt.info\/wordpress\/wp-content\/uploads\/2012\/06\/AmplEarph3262S3.gif 475w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This picture was dated Oct 2002 so I had already built it and put it into service by then.\u00a0 I took the handset of an old phone, and sawed off the handle and microphone, leaving just the part that holds the earphone. \u00a0 I built the circuit on a piece of perfboard and installed it<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=3028\"> <\/p>\n<p> (Read More&#8230;)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3028","post","type-post","status-publish","format-standard","hentry","category-audio"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3028"}],"version-history":[{"count":7,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3028\/revisions"}],"predecessor-version":[{"id":3673,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3028\/revisions\/3673"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}