{"id":3616,"date":"2025-10-14T06:25:30","date_gmt":"2025-10-14T06:25:30","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=3616"},"modified":"2025-10-17T05:38:14","modified_gmt":"2025-10-17T05:38:14","slug":"how-should-pcb-circuit-boards-be-laid-out","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/da\/how-should-pcb-circuit-boards-be-laid-out\/","title":{"rendered":"Hvordan skal printkort l\u00e6gges ud?"},"content":{"rendered":"<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Principper for layout af PCB-komponenter<\/h2>\n\n\n\n<p>I <a href=\"https:\/\/flj-pcb.com\/da\/pcb-design\/\" data-type=\"page\" data-id=\"3488\">Design af PCB-layout<\/a>, placeringen af komponenter er afg\u00f8rende. Det p\u00e5virker, hvor p\u00e6nt kortet ser ud, og l\u00e6ngden og antallet af trykte spor. Det p\u00e5virker ogs\u00e5 enhedens samlede p\u00e5lidelighed. Her f\u00f8lger en r\u00e6kke grundl\u00e6ggende regler, som placeringen af PCB-komponenter b\u00f8r f\u00f8lge.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">J\u00e6vn og konsistent fordeling<\/h3>\n\n\n\n<p>Placer komponenterne, s\u00e5 de er j\u00e6vnt fordelt over hele pladen. Hold t\u00e6theden og afstanden konsistent. Lad ikke komponenterne fylde hele printet. Lad der v\u00e6re lidt plads rundt om kanterne. Hvor stor den tomme margen skal v\u00e6re, afh\u00e6nger af printpladens areal, og hvordan den er fastgjort i produktet. Komponenter, der sidder lige p\u00e5 printkanten, skal v\u00e6re mindst 3 mm fra printkanten. I elektroniske instrumenter er det almindeligt at efterlade 5 til 10 mm plads langs hver kant.<\/p>\n\n\n\n<p>Generelt skal du placere komponenter p\u00e5 den ene side af printet, n\u00e5r du kan. Hver ledning p\u00e5 en komponent b\u00f8r have sin egen loddeplade.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"700\" height=\"245\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-layout.webp\" alt=\"Component layout\" class=\"wp-image-4013\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-layout.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-layout-300x105.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Ingen overlapning og tilstr\u00e6kkelig plads<\/h3>\n\n\n\n<p>Komponenterne m\u00e5 ikke overlappe hinanden fra top til bund p\u00e5 en m\u00e5de, s\u00e5 de krydser hinanden. Hold tilstr\u00e6kkelig afstand mellem tilst\u00f8dende komponenter. Afstanden m\u00e5 ikke v\u00e6re for lille til at undg\u00e5 fysisk kontakt. Hvis to komponenter i n\u00e6rheden har en stor potentialeforskel, skal du holde en sikker afstand mellem dem. I almindelige milj\u00f8er er et sikkert luftgab ca. 200 V pr. mm. Det vil sige, at hvis du forventer h\u00f8je sp\u00e6ndingsforskelle, skal du \u00f8ge afstanden.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"350\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-placement-direction.webp\" alt=\"Component placement direction\" class=\"wp-image-4015\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-placement-direction.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-placement-direction-300x150.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Lav monteringsh\u00f8jde<\/h3>\n\n\n\n<p>G\u00f8r monteringsh\u00f8jden p\u00e5 komponenterne s\u00e5 lav som muligt. En komponents ledning b\u00f8r ikke stikke mere end ca. 5 mm op over printet. Hvis dele sidder for h\u00f8jt, modst\u00e5r de vibrationer og st\u00f8d d\u00e5rligt. H\u00f8je dele kan vippe, falde ned eller r\u00f8re ved nabokomponenter. Det s\u00e6nker p\u00e5lideligheden.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"245\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Assembly.webp\" alt=\"Component Assembly\" class=\"wp-image-4012\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Assembly.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Assembly-300x105.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Aksens retning og regelm\u00e6ssighed<\/h3>\n\n\n\n<p>Bestem komponenternes akseretninger i henhold til, hvordan printet skal sidde og fastg\u00f8res i det endelige produkt. Ved regelm\u00e6ssige opstillinger af komponenter skal aksen p\u00e5 store dele justeres, s\u00e5 de st\u00e5r lodret i forhold til produktet. Det forbedrer den mekaniske stabilitet p\u00e5 printet. Justering af akser hj\u00e6lper med at holde delene fast under vibrationer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pad-afstand og lead-b\u00f8jninger<\/h3>\n\n\n\n<p>Pads i begge ender af en komponent skal v\u00e6re lidt bredere end komponentens aksiale l\u00e6ngde. N\u00e5r du b\u00f8jer ledninger, m\u00e5 du ikke b\u00f8je lige ved roden. Lad der v\u00e6re lidt lige ledningsl\u00e6ngde f\u00f8r b\u00f8jning - mindst 2 mm - for at undg\u00e5 at beskadige kroppen. Det reducerer belastningen p\u00e5 komponentens ledning og loddeforbindelsen.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">S\u00e5dan monteres og fastg\u00f8res komponenter p\u00e5 PCB<\/h2>\n\n\n\n<p>Der er to hovedtyper af montering af komponenter p\u00e5 et printkort: lodret (oprejst) og vandret (liggende). Vandret betyder, at komponentens akse er parallel med printkortets overflade. Lodret betyder, at aksen er vinkelret. Begge metoder har fordele og ulemper. Brug dem fleksibelt, n\u00e5r du designer. Du kan bruge \u00e9n stil eller en blanding af begge. S\u00f8rg for, at kredsl\u00f8bet modst\u00e5r vibrationer, er let at servicere, og at komponentlayoutet er j\u00e6vnt. Det vil ogs\u00e5 v\u00e6re en hj\u00e6lp, n\u00e5r du skal tr\u00e6kke spor.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"245\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Mounting-Methods.webp\" alt=\"Component Mounting Methods\" class=\"wp-image-4014\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Mounting-Methods.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Mounting-Methods-300x105.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Lodret (opretst\u00e5ende) montering<\/h3>\n\n\n\n<p>Vertikalt monterede komponenter fylder mindre p\u00e5 printet. Du kan f\u00e5 plads til flere dele pr. arealenhed. Det er godt til t\u00e6tte produktdesigns som b\u00e6rbare radioer og h\u00f8reapparater. Mange sm\u00e5 b\u00e6rbare instrumenter bruger lodret montering.<\/p>\n\n\n\n<p>Lodrette dele skal dog v\u00e6re sm\u00e5 og lette. Store eller tunge dele er ikke egnede til lodret montering. Tunge dele reducerer den mekaniske styrke og s\u00e6nker vibrationsmodstanden. De kan vippe eller falde og ber\u00f8re andre dele, hvilket giver problemer med p\u00e5lideligheden.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vandret (liggende) montering<\/h3>\n\n\n\n<p>Vandret montering giver bedre mekanisk stabilitet. Det f\u00e5r printet til at se p\u00e6nere ud. Vandret montering \u00f8ger komponentsp\u00e6ndet mellem loddepuderne, hvilket g\u00f8r det lettere at f\u00f8re en sporing mellem de to loddepunkter. Det er nyttigt for sporlayout. Vandret montering er generelt at foretr\u00e6kke, n\u00e5r mekanisk stabilitet og nem routing er vigtig.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Formater for placering af PCB-komponenter<\/h2>\n\n\n\n<p>Komponenterne skal placeres j\u00e6vnt, p\u00e6nt og kompakt p\u00e5 printet. Pr\u00f8v at reducere og forkorte forbindelserne mellem kredsl\u00f8bsenhederne og mellem de enkelte komponenter. Der er to hovedlayoutformater p\u00e5 et printkort: uregelm\u00e6ssig placering og regelm\u00e6ssig placering. Du kan bruge det ene alene eller begge sammen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Uregelm\u00e6ssig placering<\/h3>\n\n\n\n<p>Ved uregelm\u00e6ssig placering er komponenternes akser ikke justeret, og deres positioner f\u00f8lger ingen strenge regler. Det ser rodet ud, men det giver frihed til at orientere og placere komponenterne. Den frihed g\u00f8r ofte sporlayoutet nemmere. Det kan forkorte eller reducere sammenkoblinger, hvilket i h\u00f8j grad reducerer den samlede sporl\u00e6ngde. Kortere spor s\u00e6nker parasit\u00e6re parametre og hj\u00e6lper med at reducere interferens. Uregelm\u00e6ssig placering er meget nyttig til h\u00f8jfrekvente kredsl\u00f8b. Det bruges ofte med vertikalt monterede komponenter.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"280\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Irregular-Component-Arrangement.webp\" alt=\"Irregular Component Arrangement\" class=\"wp-image-4017\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Irregular-Component-Arrangement.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Irregular-Component-Arrangement-300x120.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Regelm\u00e6ssig placering<\/h3>\n\n\n\n<p>Regelm\u00e6ssig placering justerer komponenternes akser, s\u00e5 de er parallelle eller vinkelrette p\u00e5 kortets kanter. Bortset fra h\u00f8jfrekvente dele b\u00f8r de fleste elektroniske produkter fors\u00f8ge at placere komponenterne enten parallelt eller vinkelret. Dette g\u00e6lder is\u00e6r, n\u00e5r komponenterne er monteret vandret. Regelm\u00e6ssig placering forbedrer printets udseende og g\u00f8r montering, lodning og fejlfinding nemmere. Det er ogs\u00e5 lettere at producere og vedligeholde.<\/p>\n\n\n\n<p>Regelm\u00e6ssig placering er ideel til lavfrekvente kredsl\u00f8b med moderate komponenttyper, men store m\u00e6ngder. Mange instrumenter bruger dette format. Men regelm\u00e6ssig placering l\u00e6gger begr\u00e6nsninger p\u00e5 position og retning. Trace-routing kan blive mere kompleks, og den samlede trace-l\u00e6ngde kan stige som f\u00f8lge heraf.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Placering af komponentpads p\u00e5 PCB<\/h2>\n\n\n\n<p>Hver ledning p\u00e5 en komponent skal optage en loddepude p\u00e5 printet. Pad-positionen afh\u00e6nger af komponentens st\u00f8rrelse, og hvordan den er fastgjort. Ved lodret montering eller uregelm\u00e6ssig placering kan pad-positionen v\u00e6re mindre begr\u00e6nset af komponentst\u00f8rrelse og -afstand. Ved regelm\u00e6ssig placering skal pad-positioner og -afstande f\u00f8lge visse standarder.<\/p>\n\n\n\n<p>Uanset metode b\u00f8r pad-centre (dvs. midten af det belagte hul) ikke v\u00e6re for t\u00e6t p\u00e5 printkanten. Den typiske afstand er 2,5 mm eller mere. I det mindste skal pad-midten v\u00e6re st\u00f8rre end pladetykkelsen v\u00e6k fra kanten.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"350\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Standard-Coordinate-Grid.webp\" alt=\"Standard Coordinate Grid\" class=\"wp-image-4018\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Standard-Coordinate-Grid.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Standard-Coordinate-Grid-300x150.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p>Pad-positioner b\u00f8r ideelt set falde p\u00e5 et standardkoordinatnet.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.utmel.com\/blog\/categories\/pcb\/introduction-to-pcb-layout-principles\" target=\"_blank\" rel=\"noopener\">I IEC-standarden<\/a>, Den grundl\u00e6ggende gitterafstand er 2,54 mm (den hjemlige standard er 2,5 mm). Undergitterh\u00f8jder omfatter 1,27 mm eller 0,635 mil (1,25 mm eller 0,625 mil). Disse gitterstandarder er vigtige, n\u00e5r man bruger computerst\u00f8ttet design, automatisk boring eller automatisk komponentplacering og lodning. Ved manuel boring kan du, bortset fra dobbelt in-line IC-pinafstand, sl\u00e6kke p\u00e5 den strenge overholdelse af gitteret. Alligevel skal pad-positionerne holde komponenterne p\u00e6ne og ensartede. For dele med samme st\u00f8rrelse skal du fors\u00f8ge at holde padafstanden ensartet. Pad-midterafstanden b\u00f8r ikke v\u00e6re mindre end pladetykkelsen. Det holder tingene p\u00e6ne og g\u00f8r det lettere at samle og b\u00f8je ledninger.<\/p>\n\n\n\n<p>Naturligvis er p\u00e6nhed relativ. Brug din d\u00f8mmekraft i s\u00e6rlige tilf\u00e6lde.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"280\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Flexibility-in-Component-Arrangement.webp\" alt=\"Flexibility in Component Arrangement\" class=\"wp-image-4016\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Flexibility-in-Component-Arrangement.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Flexibility-in-Component-Arrangement-300x120.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Faktorer, der p\u00e5virker PCB-layout<\/h2>\n\n\n\n<p>Mange faktorer p\u00e5virker et godt PCB-layout. Her gennemg\u00e5r vi de vigtigste.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Signalets str\u00f8mningsretning<\/h3>\n\n\n\n<p>N\u00e5r du arrangerer kredsl\u00f8bsenheder p\u00e5 et kort, skal du opdele hele kredsl\u00f8bet efter funktion. Placer funktionelle moduler i r\u00e6kkef\u00f8lge efter signalflowet. Det g\u00f8r layoutet praktisk for signalvejene. Fors\u00f8g at holde signalretningen konsistent. I de fleste tilf\u00e6lde arrangeres signalflowet fra venstre mod h\u00f8jre (input til venstre, output til h\u00f8jre) eller fra top til bund (input i toppen, output i bunden).<\/p>\n\n\n\n<p>Placer komponenter, der forbindes direkte til input- og output-stik, i n\u00e6rheden af disse stik. Layout omkring kerneenheden i hver funktionsblok. Brug f.eks. en transistor eller en IC som kerne, og placer derefter relaterede komponenter omkring den. Overvej delens form, st\u00f8rrelse, polaritet og antal ben. Juster position og retning for at forkorte ledningsf\u00f8ringen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Placering af s\u00e6rlige komponenter<\/h3>\n\n\n\n<p>Interferens i elektronisk udstyr kan komme fra mange kilder: elektrisk, magnetisk, termisk og mekanisk. N\u00e5r du designer kortets layout, skal du f\u00f8rst analysere kredsl\u00f8bsskemaet. Identificer s\u00e6rlige komponenter f\u00f8rst, og placer derefter andre dele. P\u00e5 den m\u00e5de undg\u00e5r du interferens og tager skridt til at reducere den s\u00e5 meget som muligt.<\/p>\n\n\n\n<p>S\u00e6rlige komponenter er dem, der p\u00e5virker enheden elektrisk, magnetisk, termisk eller mekanisk. Det kan ogs\u00e5 v\u00e6re dele, der skal fastg\u00f8res p\u00e5 bestemte steder p\u00e5 grund af driftskrav.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Forebyggelse af elektromagnetisk interferens (EMI)<\/h3>\n\n\n\n<p>EMI forekommer ofte i arbejdsudstyr. \u00c5rsagerne er bl.a. eksterne elektromagnetiske b\u00f8lger og d\u00e5rlig routing eller d\u00e5rlig placering af komponenter p\u00e5 printet. Mange interferensproblemer kan undg\u00e5s i layoutfasen. Hvis du ignorerer dette tidligt, kan designet mislykkes.<\/p>\n\n\n\n<p>Adskil eller afsk\u00e6rm dele, der kan p\u00e5virke hinanden. Afkort forbindelser i h\u00f8jfrekvenssektioner for at reducere distribuerede parametre og gensidig elektromagnetisk kobling. Hvis du planl\u00e6gger at bruge metalafsk\u00e6rmningsd\u00e5ser til RF-sektioner, skal du afs\u00e6tte plads p\u00e5 tavlen til afsk\u00e6rmningsst\u00f8rrelsen.<\/p>\n\n\n\n<p>F\u00f8lsomme dele b\u00f8r ikke v\u00e6re for t\u00e6t p\u00e5 st\u00f8jende dele. Adskil h\u00f8jsp\u00e6ndings- (f.eks. 220 V) og lavsp\u00e6ndingssektioner, og adskil indgangs- og udgangstrin. Hvis j\u00e6vnstr\u00f8msledningerne er lange, skal du tilf\u00f8je filtreringsdele for at stoppe 50 Hz-st\u00f8j.<\/p>\n\n\n\n<p>Hvis nogle komponenter eller spor kan have store potentialeforskelle, skal afstanden \u00f8ges for at undg\u00e5 afladning eller nedbrud. Undg\u00e5, at metalindkapslede dele r\u00f8rer hinanden. For eksempel kan metalhuset p\u00e5 en NPN-transistor eller k\u00f8lepladen p\u00e5 en effekttransistor v\u00e6re forbundet med kollektoren, som kan have et h\u00f8jt potentiale. Elektrolytkondensatorers d\u00e5ser er ofte p\u00e5 negativt potentiale eller jord. Hvis disse metalkasser ikke er isolerede, skal du s\u00f8rge for tilstr\u00e6kkelig afstand eller tilf\u00f8je isolering, ellers kan der opst\u00e5 en kortslutning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kontrol af termisk interferens<\/h3>\n\n\n\n<p>Temperaturstigning for\u00e5rsager ogs\u00e5 interferens. I layoutet skal du identificere, hvilke dele der genererer varme, og hvilke der er temperaturf\u00f8lsomme.<\/p>\n\n\n\n<p>Placer varmeudviklende dele, som f.eks. h\u00f8jeffektmodstande, t\u00e6t p\u00e5 kabinettet, eller hvor der er god luftgennemstr\u00f8mning. Brug ventilations\u00e5bninger til at hj\u00e6lpe med afk\u00f8lingen. S\u00e6t ikke varme dele sammen i klynger. Overvej k\u00f8lelegemer eller en lille bl\u00e6ser for at holde temperaturstigningen inden for gr\u00e6nserne. Store str\u00f8mf\u00f8rende dele kan forankres i kabinettet for at bruge metalskallen til varmeafledning. Hvis de skal v\u00e6re p\u00e5 printet, s\u00e5 giv dem store k\u00f8lelegemer og hold dem v\u00e6k fra andre dele.<\/p>\n\n\n\n<p>Temperaturf\u00f8lsomme dele som transistorer, IC'er og store elektrolytkondensatorer b\u00f8r ikke v\u00e6re i n\u00e6rheden af varmekilder eller i toppen af enheden, hvor temperaturen stiger mere. Langvarig opvarmning \u00e6ndrer driftspunkterne og kan forringe ydeevnen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Overvejelser om mekanisk styrke<\/h3>\n\n\n\n<p>V\u00e6r opm\u00e6rksom p\u00e5 printets balance og stabilitet. Ved store og tunge dele (effekttransformatorer, store elektrolytkondensatorer, effekttransistorer med k\u00f8lelegemer) skal du ikke kun stole p\u00e5 PCB-lodninger. Monter dem p\u00e5 chassiset, n\u00e5r det er muligt, s\u00e5 tyngdepunktet er lavt, og produktet er stabilt. Store komponenter kan vride printet eller beskadige andre komponenter og stik.<\/p>\n\n\n\n<p>Hvis en komponent vejer mere end ca. 15 g og skal sidde p\u00e5 printet, m\u00e5 du ikke kun bruge loddetin. Brug beslag, klemmer eller andre mekaniske underst\u00f8tninger.<\/p>\n\n\n\n<p>For plader, der er st\u00f8rre end ca. 200 mm \u00d7 150 mm, vil pladen blive udsat for b\u00f8jnings- og vibrationsstress. Tilf\u00f8j en mekanisk ramme eller afstiver for at forhindre deformation. Lad der v\u00e6re plads til monteringsbeslag, placeringsskruer og tilslutning af stik.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Brugbarhed og tilg\u00e6ngelighed<\/h3>\n\n\n\n<p>For justerbare dele som potentiometre, variable kondensatorer eller afstemningsspoler skal du overveje, hvordan produktet skal justeres. Hvis justeringen sker udefra, skal delens position passe til knappen p\u00e5 frontpanelet. Hvis justeringen sker internt, skal komponenten placeres, s\u00e5 den er let tilg\u00e6ngelig p\u00e5 printet.<\/p>\n\n\n\n<p>Af hensyn til sikkerheden ved fejlfinding og service skal h\u00f8jsp\u00e6ndingsdele placeres, hvor det er mindre sandsynligt, at h\u00e6nderne kommer til at r\u00f8re ved dem. Placer f.eks. CRT-h\u00f8jsp\u00e6ndingskomponenter, hvor de er sv\u00e6re at n\u00e5.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Oversigt over PCB-layout<\/h2>\n\n\n\n<p>Layout er den vigtigste del af printkortdesign. Det f\u00f8rste skridt er at arrangere delene korrekt p\u00e5 et fast printomr\u00e5de. Layout er ikke kun at forbinde komponenter med trykte linjer i henhold til skemaet. For at skabe et p\u00e5lideligt produkt skal man placere delene og deres forbindelser med omtanke.<\/p>\n\n\n\n<p>Hvis layoutet er d\u00e5rligt, kan du f\u00e5 interferens eller d\u00e5rlig ydeevne, og det teoretiske design kan mislykkes. Nogle layouts opfylder de tekniske specifikationer, men ser rodede ud. Uj\u00e6vn, uordentlig placering reducerer ikke kun den visuelle kvalitet, men g\u00f8r ogs\u00e5 montering og vedligeholdelse sv\u00e6rere. Det er ikke et fornuftigt design.<\/p>\n\n\n\n<p>Ovenst\u00e5ende retningslinjer har til form\u00e5l at give grundl\u00e6ggende viden om PCB-layout for almindelige trykte kredsl\u00f8b. F\u00f8lg dem for at g\u00f8re layoutet s\u00e5 fornuftigt som muligt. Et godt layout reducerer sporl\u00e6ngden, mindsker interferens, forbedrer den mekaniske holdbarhed, hj\u00e6lper med k\u00f8ling og g\u00f8r det lettere at fremstille og vedligeholde.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Praktisk tjekliste til PCB-layout (hurtig reference)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Opdel kredsl\u00f8bet i funktionsblokke, og placer blokkene efter signalflowet.<\/li>\n\n\n\n<li>Placer input- og output-relaterede dele i n\u00e6rheden af stikkene.<\/li>\n\n\n\n<li>Placer h\u00f8jfrekvente blokke kompakt, og hold deres spor meget korte.<\/li>\n\n\n\n<li>Adskil h\u00f8jsp\u00e6ndings- og lavsp\u00e6ndingsomr\u00e5der.<\/li>\n\n\n\n<li>Reserver plads til metalsk\u00e6rme, hvis det er n\u00f8dvendigt.<\/li>\n\n\n\n<li>Hold varmeudviklende dele i n\u00e6rheden af ventilation eller chassis.<\/li>\n\n\n\n<li>Hold temperaturf\u00f8lsomme dele v\u00e6k fra varmekilder.<\/li>\n\n\n\n<li>Brug lodret montering til t\u00e6tte, sm\u00e5 dele. Brug vandret montering for stabilitet og lettere routing.<\/li>\n\n\n\n<li>Hold mindst 3 mm fra komponentpuderne til printkanten, n\u00e5r delene er ved printkanten; typisk afstand mellem padmidt og kant \u2265 2,5 mm.<\/li>\n\n\n\n<li>Brug standard gitterafstand, n\u00e5r du planl\u00e6gger automatiseret montering (2,54 mm eller 2,5 mm).<\/li>\n\n\n\n<li>Hold afstanden mellem puderne ikke mindre end pladens tykkelse.<\/li>\n\n\n\n<li>Til tunge dele skal du bruge mekaniske st\u00f8tter i till\u00e6g til lodning.<\/li>\n\n\n\n<li>Tilf\u00f8j afstivere eller rammer til store plader (&gt; 200 \u00d7 150 mm).<\/li>\n\n\n\n<li>Lad der v\u00e6re plads til testpunkter og serviceadgang.<\/li>\n\n\n\n<li>S\u00f8rg for, at komponenternes akser er p\u00e5 linje for at opn\u00e5 p\u00e6nhed, n\u00e5r det er muligt, men v\u00e6lg uregelm\u00e6ssigt layout til RF for at reducere sporl\u00e6ngden.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-uagb-faq uagb-faq__outer-wrap uagb-block-8c5f044e uagb-faq-icon-row uagb-faq-layout-accordion uagb-faq-expand-first-true uagb-faq-inactive-other-true uagb-faq__wrap uagb-buttons-layout-wrap uagb-faq-equal-height\" data-faqtoggle=\"true\" role=\"tablist\"><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-166caa47\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\">Hvad er den vigtigste funktion af vias i PCB-design?<\/span><\/div><div class=\"uagb-faq-content\"><p>Vias forbinder forskellige kobberlag p\u00e5 et printkort, s\u00e5 signaler eller str\u00f8m kan passere mellem dem. De spiller en vigtig rolle i sammenkoblingen af flerlagskort.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-edca6e14\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\">Hvad er forskellen p\u00e5 gennemg\u00e5ende huller, blinde vias og nedgravede vias?<\/span><\/div><div class=\"uagb-faq-content\"><p>Gennemg\u00e5ende huller g\u00e5r gennem hele printet, blinde vias forbinder ydre og indre lag, og nedgravede vias er skjult mellem de indre lag.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-5cc2d238\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\">Hvordan p\u00e5virker via-st\u00f8rrelser PCB's ydeevne?<\/span><\/div><div class=\"uagb-faq-content\"><p>Mindre vias sparer plads og reducerer signaltab, men de koster mere og er sv\u00e6rere at fremstille. St\u00f8rre vias er nemmere at lave, men fylder mere.<\/p><\/div><\/div><\/div>\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>PCB Component Layout Principles In PCB layout design, the placement of components is critical. It affects how neat the board [&hellip;]<\/p>","protected":false},"author":1,"featured_media":4020,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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