{"id":34,"date":"2011-03-18T20:43:05","date_gmt":"2011-03-18T20:43:05","guid":{"rendered":"http:\/\/dial-a-grue.com\/gory\/?p=34"},"modified":"2011-03-18T20:59:34","modified_gmt":"2011-03-18T20:59:34","slug":"brain-dead-reverse-engineering","status":"publish","type":"post","link":"https:\/\/dial-a-grue.com\/gory\/?p=34","title":{"rendered":"Brain dead reverse-engineering"},"content":{"rendered":"<p>When <a title=\"Gutting the phone\" href=\"http:\/\/dial-a-grue.com\/gory\/?p=20\">gutting the phone<\/a>, I went to the trouble to preserve the hook and PTT switch infrastructure. I&#8217;m still not sure how I&#8217;m going to use them, but I figure that it&#8217;d be good to know how they work.<\/p>\n<p><a href=\"http:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_1100.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-35 alignleft\" title=\"What do these wires do?\" src=\"http:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_1100-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_1100-300x225.jpg 300w, https:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_1100-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>With the help of my trusty cat Ezra, I carefully stripped the end of all the wires, and used the continuity tester on my multimeter with some clip leads to measure what they all did.<\/p>\n<p>Not that any of you care, but if you want to know how they mapped, it&#8217;s below the break.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><!--more--><\/p>\n<p>The PTT switch is a simple SPST leaf switch, and it serviced by the lighter and separate green and red wires.<\/p>\n<p><a href=\"http:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_10741.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-38\" title=\"Switches\" src=\"http:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_10741-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_10741-300x225.jpg 300w, https:\/\/dial-a-grue.com\/gory\/wp-content\/uploads\/2011\/03\/IMG_10741-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The hook switch an ugly set of leaf switches, but the effect is a DPDT switch.<\/p>\n<table>\n<tbody>\n<tr>\n<th width=\"15%\">Off-hook<\/th>\n<th width=\"15%\">Right<\/th>\n<th width=\"15%\">Left<\/th>\n<\/tr>\n<tr>\n<td><strong>COM<\/strong><\/td>\n<td>Grey<\/td>\n<td>Blue<\/td>\n<\/tr>\n<tr>\n<td><strong>NO<\/strong><\/td>\n<td>Yellow<\/td>\n<td>Black*<\/td>\n<\/tr>\n<tr>\n<td><strong>NC<\/strong><\/td>\n<td>Red<\/td>\n<td>Green<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>* &#8211; This connection is a little noisy, and probably shouldn&#8217;t be used.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When gutting the phone, I went to the trouble to preserve the hook and PTT switch infrastructure. I&#8217;m still not sure how I&#8217;m going to use them, but I figure that it&#8217;d be good to know how they work. With the help of my trusty cat Ezra, I carefully stripped the end of all the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,8],"tags":[],"class_list":["post-34","post","type-post","status-publish","format-standard","hentry","category-phone","category-wetwork"],"_links":{"self":[{"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=\/wp\/v2\/posts\/34","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=34"}],"version-history":[{"count":0,"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=\/wp\/v2\/posts\/34\/revisions"}],"wp:attachment":[{"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=34"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=34"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dial-a-grue.com\/gory\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=34"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}