Momwe mungamvetsetse kumaliza kwapamwamba kuchokera PCB mtundu?

Kuchokera pamwamba pa PCB, pali mitundu itatu ikuluikulu: golidi, siliva ndi kuwala kofiira. PCB yagolide ndiyokwera mtengo kwambiri, siliva ndiyotsika mtengo kwambiri, ndipo yofiira yopepuka ndiyotsika mtengo kwambiri.

Mutha kudziwa ngati wopanga akudula ngodya kuchokera pamtundu wapamwamba.

Kuonjezera apo, dera mkati mwa bolodi lozungulira ndilo makamaka mkuwa woyera. Copper imapangidwa mosavuta ndi okosijeni ikawululidwa ndi mpweya, kotero wosanjikiza wakunja uyenera kukhala ndi chitetezo chomwe chatchulidwa pamwambapa.

Gold

Anthu ena amanena kuti golidi ndi mkuwa ndipo n’kulakwa.

Chonde onani chithunzi chagolide chokutidwa pa bolodi lozungulira monga momwe zilili pansipa:

Gulu lokwera mtengo kwambiri la golide ndi golide weniweni. Ngakhale ndizowonda kwambiri, zimawerengeranso pafupifupi 10% ya mtengo wa board.

Pali zabwino ziwiri zogwiritsira ntchito golide, imodzi ndiyosavuta kuwotcherera, ndipo ina ndi anti-corrosion.

Monga momwe chithunzi chili pansipa, ichi ndi chala chagolide cha memory stick zaka 8 zapitazo. Akadali wonyezimira wagolide.

Chosanjikiza chopangidwa ndi golide chimagwiritsidwa ntchito kwambiri pamapadi achigawo cha board, zala zagolide, cholumikizira shrapnel, ndi zina zambiri.

Ngati mupeza kuti matabwa ena ozungulira ndi asiliva, ayenera kudulidwa ngodya. Timachitcha “kuchepetsa mitengo”.

Nthawi zambiri, ma boardboard a mafoni am’manja amakhala okutidwa ndi golide, koma ma boardboard apakompyuta ndi ma board ang’onoang’ono a digito samakutidwa ndi golide.

Chonde tchulani bolodi la iPhone X pansipa, mbali zowonekera zonse ndizokutidwa ndi golide.

Silver

Golide ndi golide, siliva ndi siliva? Ayi ndithu, ndi malata.

Gulu la siliva limatchedwa HASL board. Kupopera malata pansanjika yakunja yamkuwa kumathandizanso kutenthetsa, koma sikukhazikika ngati golide.

Zilibe mphamvu pazigawo zowotcherera kale za board ya HASL. Komabe, ngati padiyo imawululidwa ndi mpweya kwa nthawi yayitali, monga mapepala apansi ndi zitsulo, zimakhala zosavuta kuti oxidize ndi dzimbiri, zomwe zimapangitsa kuti musagwirizane.

Zogulitsa zazing’ono zonse za digito ndi matabwa a HASL. Pali chifukwa chimodzi chokha: zotsika mtengo.

Kuwala kofiira

OSP (Organic Solderability Preservative), ndi organic, osati zitsulo, choncho ndi yotsika mtengo kuposa HASL ndondomeko.

Ntchito yokhayo ya filimu yachilengedwe ndikuwonetsetsa kuti zojambulazo zamkuwa zamkati sizikhala oxidized pamaso pa soldering.

Filimuyo ikasanduka nthunzi, imasanduka nthunzi ndikutenthedwa. Ndiye mukhoza kugulitsa waya wamkuwa ndi chigawocho pamodzi.

Koma sachedwa dzimbiri. Ngati bolodi la OSP likuwonekera pamlengalenga kwa masiku opitilira 10, silingagulitsidwe.

Pali njira zambiri za OSP pa bolodi lamakompyuta. Chifukwa kukula kwa board board ndi kwakukulu kwambiri.