SMT|| Amathiphu okwakha kahle izingxenye ezikhethekile ze-PCB

Ebhodini le-PCB, sivamise ukusebenzisa izakhi eziyinhloko ezisetshenziswa njalo, izakhi ezibalulekile kusekethe, izingxenye eziphazamiseka kalula, izingxenye zamandla kagesi aphezulu, izakhi zenani eliphezulu lekhalori kanye nezinye izakhi zobulili obuhlukile ezibizwa ngokuthi izakhi ezikhethekile. Isakhiwo sokuvakasha salezi zingxenye ezikhethekile sidinga ukuhlaziya okucophelela kakhulu. Ngenxa yokuthi ukubekwa okungafanele kwalezi zingxenye ezikhethekile kungase kuholele emaphutheni okuhambisana kwesifunda kanye namaphutha obuqotho besignali, okuholela ekubeni yonke ibhodi yesifunda ye-PCB ingakwazi ukusebenza.

Lapho uklama indlela yokubeka izingxenye ezikhethekile, qala ngokucabangela ubukhulu be-PCB. Uma usayizi we-PCB mkhulu kakhulu, umugqa wokuphrinta mude kakhulu, i-impedance iyanda, ukumelana nokomile kuyancipha, futhi izindleko ziyanda. Uma kukuncane kakhulu, ukuchithwa kokushisa akukuhle, futhi imigqa eseduze iyakwazi ukuphazamiseka.

Ngemva kokunquma usayizi we-PCB, thola indawo yesikwele yezingxenye ezikhethekile. Ekugcineni, zonke izingxenye zesekethe zihlelwa ngokweyunithi yokusebenza. Ukuma kwezingxenye ezikhethekile kufanele ngokuvamile kulandele izimiso ezilandelayo lapho kuhlelwa:

Isimiso sesakhiwo sezingxenye ezikhethekile

1. Nciphisa ukuxhumana phakathi kwezingxenye zefrikhwensi ephezulu ngangokunokwenzeka ukuze unciphise amapharamitha azo wokusabalalisa kanye nokuphazanyiswa kazibuthe phakathi kwezinye. Izingxenye ezithintekayo akufanele zisondelane kakhulu, futhi okokufaka kanye nokuphumayo kufanele kuqhelelene kakhulu ngangokunokwenzeka.

(2) Ezinye izingxenye noma izintambo zingase zibe nomehluko omkhulu ongase ube khona, ngakho-ke ibanga phakathi kwazo kufanele lenyuswe ukuze kugwenywe ukujikeleza okufushane ngengozi okubangelwa ukukhishwa. Izingxenye zamandla kagesi aphezulu kufanele zibekwe kude ngangokunokwenzeka ngaphandle kokufinyelela ezandleni.

3. Izingxenye ezinesisindo esingaphezu kwe-15g zingalungiswa ngobakaki bese zishiselwa. Lezi zingxenye ezisindayo nezishisayo akufanele zibekwe ebhodini lesifunda, kodwa kufanele zibekwe epuleti eliphansi lebhokisi eliyinhloko, futhi kufanele zicabangele ukuchithwa kokushisa. Gcina izingxenye ezishisayo kude nezingxenye ezishisayo.

4. Ngokuhlelwa kwezingxenye ezilungisekayo ezifana nama-potentiometers, ama-inductors aguquguqukayo, ama-variable capacitor nama-microswitches, izidingo zesakhiwo zebhodi lonke kufanele zicatshangelwe. Uma isakhiwo sivuma, ezinye izinguquko ezivame ukusetshenziswa kufanele zibekwe endaweni efinyeleleka kalula esandleni. Ukuhlelwa kwezingxenye kufanele kube okulinganiselayo, okuminyene, futhi kungabi nzima kunophezulu.

Impumelelo yomkhiqizo, umuntu ukunaka ikhwalithi yangaphakathi. Kodwa uma kucatshangelwa ubuhle bubonke, womabili angamabhodi e-PCB aphelele ukuze abe yimikhiqizo ephumelelayo.