Cov muaj pes tsawg leeg hauv lub PCB pawg thawj coj saib

Tam sim no Circuit Board feem ntau muaj cov hauv qab no:

Circuit Court thiab qauv (Pattern): Circuit Court yog siv los ua ib qho cuab yeej rau kev sib txuas ntawm cov khoom qub. Nyob rau hauv kev tsim, ib tug loj tooj liab nto yuav ntxiv tsim raws li ib tug grounding thiab lub hwj chim txheej. Txoj kev thiab daim duab kos yog ua tib lub sijhawm.

Dielectric txheej (Dielectric): Siv los tswj cov rwb thaiv tsev ntawm Circuit Court thiab txhua txheej, feem ntau hu ua substrate.

Qhov (Los ntawm lub qhov / ntawm): Qhov los ntawm lub qhov tuaj yeem ua rau cov kab ntau tshaj ob theem txuas mus rau ib leeg, qhov loj dua los ntawm lub qhov yog siv los ua ib feem plug-in, thiab qhov tsis yog los ntawm qhov (nPTH) feem ntau yog siv. raws li qhov chaw mount Nws yog siv los kho cov ntsia hlau thaum sib dhos.

Solder resistant / Solder Mask: Tsis yog txhua qhov chaw tooj liab yuav tsum yog tin-ntawm qhov chaw, yog li thaj chaw uas tsis yog-tin yuav raug luam tawm nrog cov txheej txheem ntawm cov khoom uas insulates tooj liab nto ntawm tin-noj (feem ntau yog epoxy resin), zam luv luv Circuit Court. nruab nrab ntawm cov tsis-tinned circuits. Raws li cov txheej txheem sib txawv, nws muab faib ua roj ntsuab, roj liab thiab xiav roj.

Silk screen (Lus dab neeg / Marking / Silk screen): Qhov no yog cov qauv tsis tseem ceeb. Lub luag haujlwm tseem ceeb yog kos lub npe thiab txoj haujlwm ntawm txhua qhov ntawm lub rooj tsavxwm, uas yooj yim rau kev saib xyuas thiab kev txheeb xyuas tom qab sib dhos.

Nto Finish: Vim hais tias tooj liab nto yog yooj yim oxidized nyob rau hauv ib puag ncig, nws tsis tuaj yeem tinned (tsis zoo solderability), yog li nws yuav raug tiv thaiv ntawm tooj liab nto uas yuav tsum tau tinned. Cov kev tiv thaiv muaj xws li HASL, ENIG, Immersion Silver, Immersion Tin, thiab Organic Solder Preservative (OSP). Txhua txoj kev muaj nws qhov zoo thiab qhov tsis zoo, uas yog sau ua ke hu ua kev kho saum npoo.

Cov txiaj ntsig loj heev rau cov engineers, thawj PCB tsom xam software, nyem kom tau txais nws dawb

PCB board yam ntxwv tuaj yeem ua tau siab ceev. Tau ntau xyoo lawm, qhov siab ceev ntawm cov ntawv luam tawm tuaj yeem txhim kho nrog rau kev txhim kho ntawm kev sib koom ua ke ntawm kev sib koom ua ke thiab kev nce qib ntawm mounting technology.

Kev ntseeg siab. Los ntawm kev tshuaj xyuas, kev sim thiab kev kuaj kev laus, PCB tuaj yeem ua haujlwm tau ntev (feem ntau yog 20 xyoo). Nws tuaj yeem tsim tau. Rau ntau yam kev ua tau zoo ntawm PCB (hluav taws xob, lub cev, tshuaj lom neeg, tshuab, thiab lwm yam), cov ntawv luam tawm tuaj yeem pom tau los ntawm kev tsim qauv, kev tsim qauv, thiab lwm yam, nrog lub sijhawm luv luv thiab ua haujlwm siab.

Kev tsim tawm. Nrog rau kev tswj xyuas niaj hnub no, tus qauv tsim, scaled (quantitative), automated thiab lwm yam khoom tuaj yeem ua tau los xyuas kom meej cov khoom zoo sib xws.

Kev xeem. Ib txoj kev sim ua tiav, cov qauv xeem, ntau yam khoom siv ntsuas thiab cov cuab yeej tau tsim los xyuas thiab ntsuas qhov tsim nyog thiab kev pabcuam lub neej ntawm cov khoom PCB. Nws tuaj yeem ua ke. Cov khoom siv PCB tsis yog tsuas yog yooj yim rau kev sib dhos ntawm ntau yam khoom, tab sis kuj rau kev siv tshuab thiab cov khoom loj loj. Nyob rau tib lub sijhawm, PCB thiab ntau yam khoom siv sib dhos tuaj yeem sib sau ua ke los tsim cov khoom loj thiab cov tshuab, mus txog qhov ua tiav machine.maintainability. Txij li cov khoom PCB thiab ntau yam khoom sib dhos yog tsim thiab tsim los ntawm cov nplai loj, cov khoom no kuj yog tus qauv. Yog li ntawd, thaum lub kaw lus tsis ua haujlwm, nws tuaj yeem hloov tau sai, yooj yim thiab yoog raws, thiab lub kaw lus tuaj yeem rov qab ua haujlwm sai. Tau kawg, muaj peev xwm ua tau ntau yam piv txwv. Xws li miniaturization thiab qhov hnyav txo ntawm qhov system, thiab kev kub ceev teeb liab kis tau tus mob.

Dab tsi yog qhov txawv ntawm PCB pawg thawj coj saib thiab kev sib koom ua ke?

Integrated Circuit Features

Integrated circuits muaj qhov zoo ntawm qhov me me, lub teeb yuag, tsawg dua cov hlau lead thiab cov ntsiab lus soldering, lub neej ntev, kev ntseeg siab, thiab kev ua haujlwm zoo. Nyob rau tib lub sijhawm, lawv muaj tus nqi qis thiab yooj yim rau kev tsim khoom loj. Nws tsis yog tsuas yog siv dav hauv kev lag luam thiab pej xeem cov khoom siv hluav taws xob xws li cov kaw lus kaw lus, TV, khoos phis tawj, thiab lwm yam, tab sis kuj tseem siv hauv tub rog, kev sib txuas lus, thiab kev tswj chaw taws teeb. Siv cov kev sib txuas ua ke los sib sau cov khoom siv hluav taws xob, kev sib dhos ceev tuaj yeem nce ntau ntau kaum rau ntau txhiab zaus dua li ntawm cov transistors, thiab lub sijhawm ua haujlwm ruaj khov ntawm cov khoom siv kuj tuaj yeem txhim kho tau zoo.

Integrated Circuit Application Piv txwv

Integrated Circuit IC1 yog 555 lub sij hawm Circuit Court, uas yog kev cob cog rua raws li ib tug monostable Circuit Court ntawm no. Nquag, vim tias tsis muaj qhov cuam tshuam hluav taws xob ntawm P lub davhlau ya nyob twg ntawm lub kov ncoo, lub capacitor C1 raug tso tawm los ntawm 7 tus pin ntawm 555, qhov tso zis ntawm tus pin thib 3 yog qhov qis, cov relay KS raug tso tawm, thiab lub teeb tsis ua haujlwm. taws.

Thaum koj yuav tsum tau qhib lub teeb, kov cov hlau daim P nrog koj txhais tes, thiab lub teeb liab clutter voltage induced los ntawm tib neeg lub cev yog ntxiv los ntawm C2 mus rau lub trigger terminal ntawm 555, thiaj li hais tias cov zis ntawm 555 hloov ntawm qis mus rau siab. . KS relay rub tawm thiab lub teeb tig rau. Ci ntsa iab. Nyob rau tib lub sijhawm, tus pin 7th ntawm 555 raug txiav tawm sab hauv, thiab cov khoom siv hluav taws xob them C1 txog R1, uas yog qhov pib ntawm lub sijhawm.

Thaum lub voltage ntawm lub capacitor C1 nce mus rau 2/3 ntawm lub hwj chim mov voltage, tus 7 tus pin ntawm 555 yog qhib rau tso tawm C1, thiaj li hais tias cov zis ntawm tus thib 3 tus pin hloov los ntawm theem siab mus rau theem qis, lub relay tso tawm. , lub teeb tawm mus, thiab lub sijhawm xaus.

Lub sij hawm ntev yog txiav txim los ntawm R1 thiab C1: T1 = 1.1R1 * C1. Raws li tus nqi cim nyob rau hauv daim duab, lub sij hawm lub sij hawm yog hais txog 4 feeb. D1 tuaj yeem xaiv 1N4148 lossis 1N4001.

Dab tsi yog qhov txawv ntawm PCB pawg thawj coj saib thiab kev sib koom ua ke?

Nyob rau hauv lub voj voog ntawm daim duab, lub sij hawm lub hauv paus Circuit Court 555 yog txuas raws li ib tug astable Circuit Court, thiab cov zis zaus ntawm tus pin 3 yog 20KHz, thiab lub luag hauj lwm piv yog 1: 1 square yoj. Thaum tus pin 3 siab, C4 raug them; Thaum qis, C3 raug them. Vim tias muaj VD1 thiab VD2, C3 thiab C4 tsuas yog them tab sis tsis tawm hauv Circuit Court, thiab tus nqi them siab tshaj plaws yog EC. Txuas B davhlau ya nyob twg rau hauv av, thiab ib qho +/-EC dual fais fab mov tau txais ntawm ob qhov kawg ntawm A thiab C. Cov zis tam sim no ntawm qhov hluav taws xob ntau tshaj 50mA.

Dab tsi yog qhov txawv ntawm PCB pawg thawj coj saib thiab kev sib koom ua ke?

Qhov sib txawv ntawm PCB board thiab integrated circuit. Kev sib xyaw ua ke feem ntau yog hais txog kev sib koom ua ke ntawm cov chips, zoo li Northbridge nti ntawm lub motherboard, sab hauv ntawm CPU yog hu ua integrated circuit, thiab thawj lub npe tseem hu ua integrated block. Thiab cov ntawv luam tawm yog hais txog lub rooj tsav xwm hauv Circuit Court uas peb feem ntau pom, nrog rau cov ntawv luam tawm ntawm lub rooj tsavxwm.

Integrated Circuit Court (IC) yog soldered ntawm lub rooj tsavxwm PCB; PCB pawg thawj coj saib yog tus nqa khoom ntawm kev sib koom ua ke (IC). Lub rooj tsavxwm PCB yog lub rooj tsavxwm luam tawm (PCB). Cov ntawv luam tawm Circuit boards tshwm nyob rau hauv yuav luag txhua yam khoom siv hluav taws xob. Yog tias muaj cov khoom siv hluav taws xob hauv qee yam khoom siv, cov ntawv luam tawm Circuit Court boards tag nrho rau ntawm PCBs ntawm ntau qhov sib txawv. Ntxiv nrog rau kev kho ntau yam me me, lub luag haujlwm tseem ceeb ntawm lub rooj tsav xwm luam tawm yog kom hluav taws xob txuas rau sab sauv rau ib leeg.

Yooj yim muab tso, ib qho kev sib xyaw ua ke sib txuas ua ke ib lub hom phiaj dav dav rau hauv lub nti. Nws yog tag nrho. Thaum nws puas lawm sab hauv, cov nti kuj puas lawm, thiab PCB tuaj yeem ua cov khoom siv los ntawm nws tus kheej, thiab hloov cov khoom yog tias nws tawg.