{"id":18794,"date":"2010-12-21T17:01:24","date_gmt":"2010-12-21T16:01:24","guid":{"rendered":"http:\/\/www.cqdx.ru\/blog\/?p=18794"},"modified":"2023-10-04T19:02:33","modified_gmt":"2023-10-04T17:02:33","slug":"make-your-kids-happy","status":"publish","type":"post","link":"https:\/\/www.cqdx.ru\/ham\/diy\/make-your-kids-happy\/","title":{"rendered":"Make your kids happy"},"content":{"rendered":"<p>Your First Crystal Radio (How to) or building a crystal radio out of household items.<\/p>\n<p style=\"text-align: center;\">\n<p>The most difficult part of building a crystal radio is building an efficient earphone that can convert the tiny electrical signals into tiny sounds that our ears can hear. Our first radio used a telephone handset for an earphone, and that works quite well. But another type of earphone is available that fits in the ear so you don&#8217;t have to hold it. It is also more sensitive than the telephone handset.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-24274 alignleft\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2011\/08\/series_radio-300x203.jpg\" alt=\"\" width=\"300\" height=\"203\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2011\/08\/series_radio-300x203.jpg 300w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2011\/08\/series_radio.jpg 502w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>In order to convert very faint electrical signals into sound, we need a very sensitive earphone. The kind of earphones used in transistor radios or CD players will not do. Those are meant to be driven by a signal loud enough to drive a speaker, and are not sensitive at all.<\/p>\n<p><a href=\"http:\/\/scitoys.com\/scitoys\/scitoys\/radio\/homemade_radio.html\" target=\"_blank\" rel=\"noopener\">More<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Your First Crystal Radio (How to) or building a crystal radio out of household items. The most difficult part of building a crystal radio is building an efficient earphone that can convert the tiny electrical signals into tiny sounds that our ears can hear. Our first radio used a telephone handset for an earphone, and&hellip;<\/p>\n","protected":false},"author":2,"featured_media":37880,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[194,219,221],"class_list":["post-18794","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diy","tag-ham_radio","tag-home-made","tag-howto","category-2","description-off"],"_links":{"self":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts\/18794","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/comments?post=18794"}],"version-history":[{"count":0,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts\/18794\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/media\/37880"}],"wp:attachment":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/media?parent=18794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/categories?post=18794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/tags?post=18794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}