Hanyar lissafi na PCB fadin layin da na yanzu shine kamar haka:

Da farko lissafin yanki na Track. Kauri na jan ƙarfe na yawancin PCBS shine 35um (idan ba ku da tabbas, kuna iya tambayar mai ƙera PCB). Yankin giciye yana ninka ta faɗin layin. Akwai ƙima mai ƙarfi don ƙima na yanzu wanda ya kama daga 15 zuwa 25 amperes a kowace murabba’in milimita.

Auna ma’aunin giciye don samun damar wucewa. I = KT0.44a0.75K shine daidaiton daidaitawa. Gabaɗaya, ana ɗaukar 0.024 a cikin murfin ciki na waya da aka lulluɓe da jan ƙarfe, kuma ana ɗaukar 0.048t a cikin mayafin waje yayin da matsakaicin zafin zafin ya hauhawa, kuma naúrar ita ce Celsius (wurin narkar da jan ƙarfe shine 1060 ℃). A shine yanki na giciye na mayafi na jan ƙarfe, kuma rukunin shine murabba’in MIL (ba mm mm, Ni ne matsakaicin halin yanzu da ake iya ba da izini, rukunin amperes (AMP) gabaɗaya 10mil = 0.010inch = 0.254, wanda zai iya zama 1A, 250MIL = 6.35mm, kuma shine bayanan 8.3A. Lissafin ƙarfin ɗaukar nauyi na PCB yanzu ya rasa hanyoyin fasaha masu ƙarfi da dabaru. Gogaggen injiniyoyin CAD sun dogara da ƙwarewar mutum don yanke hukunci daidai. Amma ga CAD novice, ba za a iya cewa ya sadu da matsala mai wahala ba.

Ikon ɗaukar nauyi na PCB na yanzu ya dogara da dalilai masu zuwa: faɗin layin, kaurin layi (kauri mai kauri na jan ƙarfe), haɓakar zafin jiki mai halatta. Kamar yadda muka sani, faɗin layin PCB mafi girma, mafi girman ƙarfin ɗaukar kaya na yanzu. Anan, don Allah gaya mani: ɗauka cewa 10MIL na iya jurewa 1A a ƙarƙashin yanayi iri ɗaya, nawa halin yanzu 50MIL zai iya jurewa, shin 5A ne? Tabbas, amsar ita ce a’a. Girman layin yana cikin na Inch (Inch Inch = 25.4 millimeters) 1 oz. Copper = 35 micron thick, 2 oz. = 70 micron thick, 1 oz = 0.035mm 1mil. = 10-3inch. Trace Capacityper MIL STD 275

Dole ne a yi la’akari da raguwar matsin lamba ta hanyar juriya na tsawon waya a cikin gwaji. Ana amfani da tin ɗin akan walda na sarrafawa don ƙara ƙarfin halin yanzu, amma yana da wahala a sarrafa ƙarar tin. 1 OZ jan ƙarfe, faɗin 1mm, gaba ɗaya 1-3 A galvanometer, gwargwadon tsawon layin ku, buƙatun saukar da matsin lamba.

Matsakaicin ƙimar yanzu yakamata ya zama mafi girman ƙimar da aka yarda da ita a ƙarƙashin iyakar haɓaka zafin jiki, kuma ƙimar fis ɗin shine ƙimar da zafin zafin ya kai wurin narkar da jan ƙarfe. Misali. 50mil 1oz zazzabi ya tashi digiri 1060 (watau wurin narkar da jan ƙarfe), halin yanzu shine 22.8A.