{"id":930894,"date":"2021-04-21T08:33:59","date_gmt":"2021-04-21T07:33:59","guid":{"rendered":"https:\/\/sindik.at\/?p=930894"},"modified":"2021-04-21T08:33:59","modified_gmt":"2021-04-21T07:33:59","slug":"uprava-rgb-na-zx-spectre-2","status":"publish","type":"post","link":"https:\/\/sindik.at\/?p=930894","title":{"rendered":"\u00daprava RGB na ZX Spectre +2"},"content":{"rendered":"\n

V poslednej dobe som mal svoju +2jku celkom \u010dasto zapnut\u00fa a neskuto\u010dne ma iritoval blikaj\u00faci obraz pri zobrazen\u00ed cez RGB. Ke\u010f\u017ee na RGB konektore nie je miesto pre Blanking sign\u00e1l, pripojil som tam video v\u00fdstup, ktor\u00fd by mal ma\u0165 okolo 1V a udr\u017ea\u0165 telku v RGB m\u00f3de. Na predposlednom Sindikate som e\u0161te sk\u00fa\u0161al pripoji\u0165 kondenz\u00e1tor, ktor\u00fd by mal udr\u017ea\u0165 kol\u00edsav\u00e9 nap\u00e4tie kompozitn\u00e9ho videa nad 1V, ale st\u00e1le to nefungovalo. Tak som sa na po poslednom Sindikate rozohnil a dal sa do pr\u00e1ce.<\/p>\n\n\n\n\n\n\n\n

Prv\u00fa vec, \u010do som sk\u00fasil, bolo pripoji\u0165 baterku na blanking sign\u00e1l, \u010di je v\u00f4bec toto d\u00f4vod blikania obrazu. Ke\u010f\u017ee pokus bol \u00faspe\u0161n\u00fd, tak som na \u010fal\u0161\u00ed de\u0148 pokra\u010doval v bastlen\u00ed.<\/p>\n\n\n\n

Pred obedom som za\u010dal b\u00e1dan\u00edm, ako najlep\u0161ie vyrie\u0161i\u0165 Blanking sign\u00e1l a nestrati\u0165 kompozitn\u00e9 video. Prv\u00fd n\u00e1pad bol spravi\u0165 si prep\u00edna\u010d Composite\/RGB pre RGB konektor. Dokonca som si jeden pekn\u00fd vymontoval z in\u00e9ho zariadenia, \u017ee ho niekam dobastl\u00edm, ale po otvoren\u00ed skrikny som zistil, \u017ee sa okolo video konektorov nikam nezmest\u00ed. Tak\u017ee b\u00e1danie pokra\u010duje.<\/p>\n\n\n\n

Pri naozaj pozornom poh\u013eade na zadn\u00fa stenu po\u010d\u00edta\u010da som si ale uvedomil, \u017ee tam u\u017e jeden konektor vhodn\u00fdch tvarov je, ktor\u00fd navy\u0161e v\u00f4bec nepou\u017e\u00edvam. Cinch na TV v\u00fdstupe je skr\u00e1tka to prav\u00e9 orechov\u00e9 pre video v\u00fdstup a RGB konektor teda m\u00f4\u017ee by\u0165 plne vyu\u017eit\u00fd na RGB sign\u00e1ly. Tak\u017ee fin\u00e1lny pl\u00e1n je privies\u0165 na RGB konektor cca. 1.5V pre blanking a na Cinch modul\u00e1tora zasa kompozitn\u00e9 video. Na toto sa hod\u00ed prepojka LK4 (tak to bolo v mojom pr\u00edpade, m\u00f4\u017ee by\u0165 tie\u017e prepojka LK2), ktor\u00fa sta\u010d\u00ed vyp\u00e1jkova\u0165 a z\u00edskame v\u00fdstup kompozitn\u00e9ho videa a vstup Blanking sign\u00e1lu.<\/p>\n\n\n\n

Za\u010dnime Blanking sign\u00e1lom. Nejak\u00e9 stabiln\u00e9 nap\u00e4tie medzi 1V a\u017e 3V v Spectre moc nen\u00e1jdeme, tak\u017ee si ho treba vytvori\u0165. Aj ke\u010f som vy\u0161tudovan\u00fd priemyslov\u00e1k, harv\u00e9rovo nie som na tom moc dobre. \u010co si ale pam\u00e4t\u00e1m, treba spravi\u0165 deli\u010d nap\u00e4tia. Vyzer\u00e1 to takto:<\/p>\n\n\n\n

\"\"<\/a>
Deli\u010d nap\u00e4tia<\/em><\/figcaption><\/figure>\n\n\n\n

Ak na \u013eav\u00fa stranu privedieme 5V, potom vieme vhodn\u00fdmi pomermi odporov dosta\u0165 na pravej strane \u017eelan\u00e9 nap\u00e4tie. M\u00f4j prv\u00fd n\u00e1strel boli hodnoty R1 = 6k8 a R2 = 2k2. Vrav\u00edm si, rad\u0161ej viac, nech neza\u0165a\u017eujem zdroj. Vypo\u010d\u00edtame si pr\u00fad cez obvod: I = U \/ R = 5 \/ (6800+2200) = \u00bdmA. Pre v\u00fdpo\u010det nap\u00e4tia pou\u017eijeme vzor\u010dek U = I\u22c5R. To n\u00e1m d\u00e1va nap\u00e4tie na R1 3.7V a na R2 1.2V. Deli\u010d zapoj\u00edm, napr\u00e1zdno nameriam presne 1.2V a tak nad\u0161ene pripoj\u00edm po\u010d\u00edta\u010d na monitor a ni\u010d. \u010cierno\u010dierna tma. Zrejme pr\u00edli\u0161 m\u00e4kk\u00fd zdroj, je treba zn\u00ed\u017ei\u0165 odpory.<\/p>\n\n\n\n

V duchu podobn\u00fdch v\u00fdpo\u010dtov prich\u00e1dzam k pomere odporov R1 = 2k2 a R2 = 680. Napr\u00e1zdno op\u00e4\u0165 namer\u00e1m pekn\u00fdch 1.2V, ale po pripojen\u00ed monitora sotva 5 desat\u00edn volta. Tu nie\u010do nehr\u00e1. Vyp\u00ednam Spectrum, beriem do ruky ohmmeter a meriam Blanking k zemi. V\u00fdsledok je 75 \u03a9. To je s\u00edce pekn\u00e1 hodnota v TV technike, ale ja by som rad\u0161ej gu\u013eat\u00e9 matematick\u00e9 nekone\u010dno. Ka\u0161lem teda na pln\u00fd deli\u010d, preto\u017ee odpor Blanking sign\u00e1lu s\u0165ahuje nap\u00e4tie dolu a vypo\u010d\u00edtam deli\u010d pre R2 = 75 \u03a9. Vych\u00e1dza mi hodnota R1 = 237 \u03a9, ktor\u00fa zapoj\u00edm s\u00e9riovo (vlastn\u00e9 najbli\u017e\u0161\u00ed mo\u017en\u00fd 240 \u03a9 odpor) medzi 5V a Blanking sign\u00e1l. V\u0161etko funguje skvelo, ni\u010d nehor\u00ed, mer\u00e1k ukazuje 1.5V.<\/p>\n\n\n\n

M\u00f4\u017eem sa teda vrhn\u00fa\u0165 na video v\u00fdstup. Pl\u00e1n u\u017e je viac mechanick\u00fd, ako teoretick\u00fd. Vyv\u0155ta\u0165 dve diery do plechov modul\u00e1tora a privies\u0165 video v\u00fdstup od konektora RGB na cinch TV modul\u00e1tora \u010do najkrat\u0161ou cestou. Video z RGB chcem preto, \u017ee viem, \u017ee zobrazuje dobre. To, \u010do vstupuje do modul\u00e1tora, by aj tak potrebovalo \u00fapravy. Navy\u0161e som pri h\u013eadan\u00ed „Composite modov“ narazil na \u010dast\u00fa \u00fapravu odstrihnutia +5V do modul\u00e1tora, \u010do som tie\u017e zrealizoval. Samotn\u00e1 realiz\u00e1cia bola z\u00e1le\u017eitos\u0165ou chv\u00ed\u013eky. Tak hur\u00e1, zapn\u00fa\u0165 Spectrum a… Obraz je stra\u0161n\u00fd! Ono sa ani nie je \u010domu divi\u0165. Cel\u00fd modul\u00e1tor aj s cinchom je skorodovan\u00fd a pri dotyku video k\u00e1bla obraz \u0161um\u00ed, \u0161u\u0161t\u00ed a vypad\u00e1va.<\/p>\n\n\n\n

Preto pristupujem k Pl\u00e1nu B: vymeni\u0165 Cinch v modul\u00e1tore. Ako kr\u00e1sne jednoducho to znie, ale znamen\u00e1 to vybra\u0165 cel\u00fd modul\u00e1tor z dosky, odsp\u00e1jkova\u0165 plechy a popasova\u0165 sa s cinchom, ktor\u00fd je zalisovan\u00fd v plechu. Toto mi zabralo celkom dos\u0165 \u010dasu a hlavne som sa b\u00e1l, \u010di nie\u010do skuto\u010dne nezni\u010d\u00edm. Na\u0161\u0165astie v\u0161etko \u0161lo dobre a sp\u00e4tn\u00e9 zlo\u017eenie u\u017e \u0161lo v\u00fdrazne lep\u0161ie. N\u00e1hradn\u00fd cinch som z\u00edskal z nefunk\u010dn\u00e9ho VGA konvertora, kde bol v kovovom preveden\u00ed 90\u00b0 do plo\u0161\u00e1ku. Bolo treba pou\u017ei\u0165 trochu n\u00e1silia a oslobodi\u0165 ho z plechov\u00e9ho p\u00fazdra a po vypilovan\u00ed v\u00e4\u010d\u0161ej diery do plechu modul\u00e1tora \u0161iel kr\u00e1sne zasp\u00e1jkova\u0165 (ne\u0161etril som ho, sp\u00e1jkova\u010dka bola na 420\u00b0C). Fin\u00e1lny poh\u013ead na \u00fapravu:<\/p>\n\n\n\n

\"\"<\/a>
Fin\u00e1lna \u00faprava<\/em><\/figcaption><\/figure>\n\n\n\n

Na obr\u00e1zku je zv\u00fdraznen\u00e1 prepojka LK4, je vidie\u0165 odpor 240\u00a0\u03a9 pripojen\u00fd na najbli\u017e\u0161\u00ed zdroj 5V a tie\u017e vyveden\u00e9 kompozitn\u00e9 video na novo osaden\u00fd konektor vo vybrakovanom modul\u00e1tore. Samozrejme kryt modul\u00e1tora som nap\u00e4\u0165 osadil, preto\u017ee mi v\u0161elijak\u00e9 \u00fapravy s odobrat\u00fdm modul\u00e1torom pripadaj\u00fa minim\u00e1lne neestetick\u00e9. Navy\u0161e sa mi ve\u013emi p\u00e1\u010di, ako sa nev\u00fdrazne, ale predsa nev\u0161edne prejavuje \u00faprava na zadnej strane po\u010d\u00edta\u010da:<\/p>\n\n\n\n

\"\"<\/a>
Zadn\u00e1 strana<\/em><\/figcaption><\/figure>\n\n\n\n

Str\u010dili by ste ant\u00e9nny k\u00e1bel do \u017elt\u00e9ho konektora? Po p\u00e1r hodin\u00e1ch testovania v\u0161etko funguje v\u00fdborne a ja som s \u00fapravou viac ne\u017e spokojn\u00fd. M\u00f4j z\u00e1mer nie je poskytn\u00fa\u0165 detailn\u00fd popis \u00fapravy, sk\u00f4r cestu k nej. A ak nie\u010do nie je hardv\u00e9rovo korektne, dajte mi vedie\u0165.<\/p>\n\n\n\n

\u017del\u00e1m V\u00e1m kri\u0161t\u00e1\u013eovo \u010dist\u00fd obraz,
mike\/zeroteam<\/p>\n","protected":false},"excerpt":{"rendered":"

V poslednej dobe som mal svoju +2jku celkom \u010dasto zapnut\u00fa a neskuto\u010dne ma iritoval blikaj\u00faci obraz pri zobrazen\u00ed cez RGB. Ke\u010f\u017ee na RGB konektore nie je miesto pre Blanking sign\u00e1l, pripojil som tam video v\u00fdstup, ktor\u00fd by mal ma\u0165 okolo … Pokra\u010dova\u0165 v \u010d\u00edtan\u00ed →<\/span><\/a><\/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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5],"tags":[],"class_list":["post-930894","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\/p5aqy8-3Uaq","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/930894","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=930894"}],"version-history":[{"count":1,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/930894\/revisions"}],"predecessor-version":[{"id":930898,"href":"https:\/\/sindik.at\/index.php?rest_route=\/wp\/v2\/posts\/930894\/revisions\/930898"}],"wp:attachment":[{"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=930894"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=930894"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sindik.at\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=930894"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}