{"id":15660,"date":"2023-01-22T14:00:27","date_gmt":"2023-01-22T13:00:27","guid":{"rendered":"http:\/\/www.crowave.com\/blog\/?p=15660"},"modified":"2023-01-22T14:00:27","modified_gmt":"2023-01-22T13:00:27","slug":"radio-sat-musiclock","status":"publish","type":"post","link":"https:\/\/www.crowave.com\/blog\/2023\/01\/22\/radio-sat-musiclock\/","title":{"rendered":"Zidni radio-sat MusiClock"},"content":{"rendered":"<p>Danas \u0107emo razgledati zidni radio-sat trgova\u010dkog naziva MusiClock. Nikakvih drugih natpisa nema na ku\u0107i\u0161tu sata, no sve komponente u unutra\u0161njosti su japanskog porijekla. \u010cini se da se ovaj model sata uvozio samo za ju\u017eni dio Evrope, a prodavao se u 1960-tim i 1970-tim godinama. Osim u crveno-naran\u010dastoj sat MusiClock je dolazio i u nekim drugim bojama (bijela ili sme\u0111a nijansa), a postojali su i modeli ne\u0161to izmijenjenog dizajna ku\u0107i\u0161ta.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_01.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15661\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_01.jpg\" alt=\"\" width=\"750\" height=\"1142\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_03.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15663\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_03.jpg\" alt=\"\" width=\"1300\" height=\"502\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_03.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_03-768x297.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>MusiClock objedinjuje elektri\u010dni sat i srednjevalni AM prijemnik (520-1600 kHz). Vidimo da su mjerene jedinice za frekvenciju na radijskoj skali kc\/s (kilo-ciklusa u sekundi). Ta jedinica se masovnije po\u010dela mijenjati u Herc tijekom 1960-tih godina, da bi u 1970-tim godinama ve\u0107 svi novi ure\u0111aji bili ozna\u010deni mjernom jedinicom Herc umjesto cycles per second (c\/s, cps).<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_02.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15662\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_02.jpg\" alt=\"\" width=\"1300\" height=\"679\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_02.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_02-768x401.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_04.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15664\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_04.jpg\" alt=\"\" width=\"1300\" height=\"445\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_04.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_04-768x263.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Krenimo prvo od prijemnika. Rije\u010d je o jednostavnom superheterodinskom AM prijemniku za srednji val koji se bazira na dva tranzistora BF 253, od kojih jedan radi kao samoosciliraju\u0107i mje\u0161a\u010d, a drugi kao MF poja\u010dalo (vjerojatno na 455 kHz). Slijedi demodulatorska germanijska dioda AA 116, a kao NF poja\u010dalo se koristi integrirani krug TBA 820 (SGS). Ovaj \u010dip sadr\u017ei poja\u010dalo u B-klasi koje mo\u017ee raditi u rasponu napona 3-16 V pri \u010demu razvija snagu do najvi\u0161e 2 W. U na\u0161em slu\u010daju, uz napon napajanja 6 V (baterije 4&#215;1,5 V) i impedanciju zvu\u010dnika od 6 \u2126, poja\u010dalo TBA 820 razvija snagu od oko 700 mW.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_06.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15666\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_06.jpg\" alt=\"\" width=\"1300\" height=\"227\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_06.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_06-768x134.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_07.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15667\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_07.jpg\" alt=\"\" width=\"1300\" height=\"236\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_07.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_07-768x139.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_08.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15668\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_08.jpg\" alt=\"\" width=\"1300\" height=\"219\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_08.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_08-768x129.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_09.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15669\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_09.jpg\" alt=\"\" width=\"1300\" height=\"420\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_09.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_09-768x248.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_05.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15665\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_05.jpg\" alt=\"\" width=\"1300\" height=\"783\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_05.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_05-768x463.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><em><span style=\"color: #00ffff;\">Kota\u010di\u0107 za pode\u0161avanje brzine rada njihala s magnetima mo\u017ee korigirati brzinu satnog mehanizma u opsegu od 5 sekundi na dan.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Satni mehanizam je sa elektri\u010dnim motorom. Op\u0107enito gledano mehani\u010dki satni mehanizmi mogu biti pokretani sa \u010detiri osnovne vrste elektri\u010dnih motora:<\/p>\n<ul>\n<li>Konvencionalni mali istosmjerni motori koji se obi\u010dno koriste samo za automatsko navijanje opruge satnog mehanizma.<\/li>\n<li>Sinkroni motori koji rade sinkronom brzinom na frekvenciji gradske mre\u017ee (50 ili 60 Hz).<\/li>\n<li>Impulsni motori koji daju magnetske impulse za odr\u017eavanje rada njihala.<\/li>\n<li>Minijaturni kora\u010dni motori koji se koriste u kvarcnim satovima.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_10.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15670\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_10.jpg\" alt=\"\" width=\"600\" height=\"468\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>U na\u0161em se slu\u010daju koristi tranzistorski impulsni elektri\u010dni motor sa fiksnim zavojnicama i njihalom sa permanentnim magnetima. Satovi sa ovakvim motorom izumljeni su u 1950-tim godinama, dakle vrlo brzo nakon izuma tranzistora (koji je slu\u017ebeno predstavio Bell Labs 1948. godine). Upotrijebljen je silicijski NPN tranzistor 2SC 923 (45 V, 30 mA).<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_11.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15671\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_11.jpg\" alt=\"\" width=\"1300\" height=\"428\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_11.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_11-768x253.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_12.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15672\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_12.jpg\" alt=\"\" width=\"1300\" height=\"426\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_12.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_12-768x252.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_13.jpg\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15673\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_13.jpg\" alt=\"\" width=\"1300\" height=\"226\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_13.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_13-768x134.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Na\u0161 tranzistorski impulsni motor ima dvije zavojnice, impulsnu i senzorsku (tako smo ih nazvali), namotane na zajedni\u010dku jezgru i sa spojenim po jednim od krajeva. Princip rada (stabilnog njihanja) motora temelji se na ciklusima ponavljanja koji uklju\u010duju dovo\u0111enje struje na impulsnu zavojnicu kad je tranzistor otvoren i dovo\u0111enje induciranog napona preko senzorske zavojnice kad je tranzistor zatvoren. Mali pomak njihala sa magnetima inducirati \u0107e u senzorskoj zavojnici spojenoj na bazu tranzistora mali strujni impuls, dovoljan da na kratko otvori tranzistor. Otvaranjem tranzistora struja preko kolektora pote\u010de kroz impulsnu zavojnicu, a stvoreni magnetski tok odgurne impulsni magnet i stvori novi njihaj. Njihalo se zatim vra\u0107a (pomo\u0107u povratne spiralne opruge) te novi prolazak senzorskog magneta pored senzorske zavojnice opet stvara napon koji otvara tranzistor i ciklus se ponavlja.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_14.gif\" rel=\"lightbox[15660]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15674\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_14.gif\" alt=\"\" width=\"600\" height=\"359\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>U 1960\/70-tim godinama srednjevalne radio postaje su bile na vrhuncu rasprostranjenosti, a UKV oda\u0161ilja\u010di su se tek po\u010deli \u0161iriti u razvijenim zemljama. Stoga je ovaj radio sat sa srednjevalnim AM prijemnikom mogao u potpunosti prakti\u010dno pokrivati obje funkcije, prikaz vremena i hvatanje nekih ja\u010dih lokalnih radio oda\u0161ilja\u010da. Kombinacije radio prijemnika i sata (budilice) zadr\u017eale su se sve do danas tako je da je proizvedeno na tisu\u0107e razli\u010ditih modela ovakvih ure\u0111aja. Naravno, kao i za mnoge druge stvari i ovdje su se umije\u0161ali mobiteli, tako da danas svu tu dizajnersku raznolikost radio-satova sve vi\u0161e zamjenjuju bezli\u010dni LCD ekrani. Pa ipak, svi ti ekrani kakve god virtualne slike prikazivali, nikad ne\u0107e dosti\u0107i razinu ljepote i osje\u0107aj koji daje jedan stvarni, opipljivi, trodimenzionalni ure\u0111aj smje\u0161ten na svoje rezervirano i istaknuto mjesto unutar jednog prostora \ud83d\ude42<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Danas \u0107emo razgledati zidni radio-sat trgova\u010dkog naziva MusiClock. Nikakvih drugih natpisa nema na ku\u0107i\u0161tu sata, no sve komponente u unutra\u0161njosti su japanskog porijekla. \u010cini se da se ovaj model sata uvozio samo za ju\u017eni dio Evrope, a prodavao se u 1960-tim i 1970-tim godinama. Osim u crveno-naran\u010dastoj sat MusiClock je dolazio i u nekim drugim [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15661,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,3],"tags":[],"class_list":{"0":"post-15660","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-radio","8":"category-satovi","9":"czr-hentry"},"jetpack_featured_media_url":"https:\/\/crowave.com\/blog\/wp-content\/uploads\/2023\/01\/musiclock_01.jpg","_links":{"self":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/15660","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/comments?post=15660"}],"version-history":[{"count":1,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/15660\/revisions"}],"predecessor-version":[{"id":15675,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/15660\/revisions\/15675"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media\/15661"}],"wp:attachment":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media?parent=15660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/categories?post=15660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/tags?post=15660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}