{"id":911339,"date":"2011-11-18T18:22:00","date_gmt":"2011-11-18T18:22:00","guid":{"rendered":"http:\/\/sindikat.bloguje.sk\/911339-nahrada-tea2000.php"},"modified":"2012-05-27T23:56:05","modified_gmt":"2012-05-27T21:56:05","slug":"911339-nahrada-tea2000-php","status":"publish","type":"post","link":"https:\/\/sindik.at\/?p=911339","title":{"rendered":"N\u00e1hrada TEA2000"},"content":{"rendered":"<p>Ako postupova\u0165 pri zni\u010den\u00ed RGB enkod\u00e9ra v 128k modeloch.<\/p>\n<p><!--more--><\/p>\n<p>V nov\u0161\u00edch verzi\u00e1ch ZX Spectra (od 128k vy\u0161\u0161ie) vyr\u00e1ba kompozitn\u00fd videosign\u00e1l (CVBS) z jednotliv\u00fdch zlo\u017eiek RGB integrovan\u00fd obvod Philips TEA2000. Ned\u00e1vno si v mojej +3 TEA povedala dos\u0165 a naveky sa odpor\u00fa\u010dala.<\/p>\n<p>Zohna\u0165 dnes tento IO je takmer nemo\u017en\u00e9. Existuj\u00fa r\u00f4zne webshopy, ktor\u00e9 pon\u00fakaj\u00fa nedostupn\u00e9 a \u0165a\u017eko zohnate\u013en\u00e9 s\u00fa\u010diastky. U nich je ale najmen\u0161ia mo\u017en\u00e1 fakt\u00fara 400$. Za to\u013ek\u00e9 peniaze by som si vedel vybavi\u0165 v\u00fdlet do Anglicka a osobne prevzia\u0165 nieko\u013eko +3 k\u00fapen\u00fdch cez eBay. Preto som h\u013eadal schodnej\u0161ie rie\u0161enie.<br \/>\nPo onej udalosti som TEU vytiahol z dosky +3 a na jej miesto osadil prec\u00edznu p\u00e4ticu. S pr\u00e1zdnou p\u00e4ticou modul\u00e1tor nedost\u00e1val na vstup \u017eiaden sign\u00e1l, aj doroben\u00fd kopozitn\u00fd v\u00fdstup mi bol na dve veci. Ako v\u0161ak nepr\u00eds\u0165 o obraz \u00faplne? RGB v\u00fdstupy st\u00e1le fungovali bez probl\u00e9mov, tak\u017ee bolo treba vymyslie\u0165 ako z nich spravi\u0165 vhodn\u00fa zmes. Aby som +3 mohol zobra\u0165 na sobotn\u00e9 stretnutie a nie\u010do s \u0148ou aj urobi\u0165 potreboval som r\u00fdchle rie\u0161enie. A na\u0161iel som ho pomerne \u013eahko. Tri odpory 330R do s\u00e9rie na ka\u017ed\u00fa farebn\u00fa zlo\u017eku a k tomu prida\u0165 synchroniz\u00e1ciu.<br \/>\nTak\u00fdmto sp\u00f4sobom som z\u00edskal pekn\u00fd \u010diernobiely obraz na kompozitn\u00fd vstup.<\/p>\n<p><img decoding=\"async\" src=\"img\/rgb_mono.png\" alt=\"\" \/><\/p>\n<p>Ako do\u010dasn\u00e9 rie\u0161enie to samozrejme posl\u00fa\u017eilo, ale ot\u00e1zka znela \u010do \u010falej. Po chv\u00edli g\u00faglenia som zistil, \u017ee nie som s\u00e1m, kto m\u00e1 tak\u00fdto probl\u00e9m. Pomerne zn\u00e1ma str\u00e1nka ZX Projects Miguela Angela pon\u00fakla <a href=\"http:\/\/www.zxprojects.com\/index.php\/replacementtea2000sp128k\/50-designreplacementtea2000\">hotov\u00e9 rie\u0161enie<\/a>. V\u010dera bol u n\u00e1s \u0161t\u00e1tny sviatok, tak pre\u010do ho nevyu\u017ei\u0165 na opravu Spectra.<\/p>\n<p><a href=\"img\/tea2000_ad722_schema.png\"><img loading=\"lazy\" decoding=\"async\" title=\"tea2000_ad722_schema.png\" src=\"img\/tea2000_ad722_schema.png\" alt=\"tea2000_ad722_schema.png\" width=\"512\" height=\"240\" \/><\/a><\/p>\n<p>N\u00e1hrada TEA2000 je zalo\u017een\u00e1 na obvode AD722, ktor\u00fd sa d\u00e1 e\u0161te st\u00e1le zohna\u0165 napr. prostredn\u00edcvtom eBay. Zainvestoval som rovno do dvoch kusov &#8211; pre pr\u00edpad, \u017ee by sa situ\u00e1cia s odk\u00faren\u00edm \u010dipu opakovala. Ich cena vr\u00e1tane po\u0161tovn\u00e9ho bola vcelku akceptovate\u013en\u00e1 &#8211; 9,73\u20ac.<\/p>\n<p>Vzh\u013eadom na to, \u017ee doska pre n\u00e1hradn\u00e9 zapojenie je pomerne mal\u00e1 nemalo v\u00fdznam p\u00fa\u0161\u0165a\u0165 sa do fotocesty alebo na\u017eeh\u013eovania f\u00f3lie. Urobil som si hodinu v\u00fdtvarnej v\u00fdchovy a plo\u0161\u00e1k nama\u013eoval za pomoci \u0161abl\u00f3ny tenkou liehovou fixou <a href=\"http:\/\/www.gme.sk\/sk\/fix-pro-kresleni-dps-s-fix-pls0-3-p746-001.html\">Edding 140S<\/a> ur\u010denou na popis DPS. Pri prekres\u013eovan\u00ed som spravil zop\u00e1r \u00faprav: pre jednoduch\u0161ie kreslenie rukou som dosku mierne zv\u00e4\u010d\u0161il, nahradil p\u00f4vodn\u00fd stabiliz\u00e1tor IC1 za \u0161tandardn\u00fd 78L05 a zn\u00ed\u017eil po\u010det prepojok na 2. Po ukon\u010den\u00ed v\u00fdtvarnej \u010dasti vyzeral plo\u0161\u00e1k nasledovne:<\/p>\n<p><img decoding=\"async\" src=\"img\/ad722_dps_1.jpg\" alt=\"ad722dps\" \/><\/p>\n<p>Pri leptan\u00ed netreba ve\u013emi\u00a0 jazdi\u0165 po povrchu \u0161tetcom, lebo fix nie je a\u017e tak\u00fd odoln\u00fd na zotretie ako sa zd\u00e1. Ako vid\u00edte na \u010fal\u0161om obr\u00e1zku, tenk\u00e1 vrstva fixu sa prejavila pavu\u010dinov\u00fdm preleptan\u00edm pl\u00f4ch, ktor\u00e9 neboli dostato\u010dne prekryt\u00e9.<\/p>\n<p><img decoding=\"async\" src=\"img\/ad722_dps_3.jpg\" alt=\"ad722dps vyleptana\" \/><\/p>\n<p>Ide o mal\u00fd plo\u0161\u00e1k, tak\u017ee v Fe2O3 sta\u010d\u00ed lepta\u0165 5-10 min\u00fat pri miernom pohybovan\u00ed n\u00e1dobou, v ktorej sa doska lept\u00e1.Po doleptan\u00ed, opl\u00e1chnut\u00ed, zotret\u00ed fixu liehom sa doska javila pou\u017eite\u013ene a\u017e na jednu preleptan\u00fa cesti\u010dku na \u013eavej strane. Preto som ju nahradil kusom dr\u00f4tika. Osadil som najprv v\u0161etky SMD s\u00fa\u010diatsky, n\u00e1sledne stabiliz\u00e1tor a kry\u0161t\u00e1l. Pri odla\u010fovan\u00ed som narazil na 2 odli\u0161nosti oproti p\u00f4vodn\u00e9mu zapojeniu:<\/p>\n<ul>\n<li>Prvou je pou\u017eit\u00fd kry\u0161t\u00e1l. V mojich z\u00e1sob\u00e1ch sa nach\u00e1dzal jeden k\u00fasok s frekvenciou 4,4336MHz. Ke\u010f som ho osadil pod\u013ea sch\u00e9my\u00a0\u2013 paralelne k C5 20pF\u00a0\u2013 obraz bol iba \u010diernobiely. Ak som kondenz\u00e1tor vynechal, objavila sa farba<\/li>\n<li>V\u00fdstupn\u00fd odpor R6 (75R) som zv\u00fd\u0161il na 200R preto\u017ee pri p\u00f4vodnej hodnote bol obraz ve\u013emi prebuden\u00fd a na v\u00fdstupe som nameral a\u017e 3V DC namiesto 1V (za odporom)<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"img\/ad722_in_plus3.jpg\" alt=\"plus3 ad722\" \/><\/p>\n<p>Po t\u00fdchto \u00faprav\u00e1ch sa objavil uspokojiv\u00fd farebn\u00fd obraz. Teraz ma \u010dak\u00e1 zis\u0165ovanie zaru\u0161enia 12V vetvy, preto\u017ee sa v obraze objavuj\u00fa nepravideln\u00e9 horizont\u00e1lne p\u00e1sy, ktor\u00e9 v pr\u00edpade p\u00f4vodnej TEI neboli vidite\u013en\u00e9 resp. a\u017e tak\u00e9 v\u00fdrazn\u00e9.<br \/>\nV\u00fdsledok si sn\u00e1\u010f budete m\u00f4c\u0165 pozrie\u0165 u\u017e na najbli\u017e\u0161om stretnut\u00ed.<br \/>\n\/ikon<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ako postupova\u0165 pri zni\u010den\u00ed RGB enkod\u00e9ra v 128k modeloch.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5],"tags":[],"class_list":["post-911339","post","type-post","status-publish","format-standard","hentry","category-tema-2-hardware-php"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5aqy8-3P51","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/911339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=911339"}],"version-history":[{"count":4,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/911339\/revisions"}],"predecessor-version":[{"id":929430,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/911339\/revisions\/929430"}],"wp:attachment":[{"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=911339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=911339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=911339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}