SMD-resistors: kufotokoza, olemba

SMD (pamwamba atakwera zipangizo ') anawamasulira kuti English amatanthauza "chipangizo wokwera padziko." SMD-zigawo kakhumi ang'onoang'ono kukula ndi kulemera kuposa mbali ochiritsira, potero kukwaniritsa kachulukidwe apamwamba a ogwiritsa pa kusindikizidwa dera bolodi zipangizo. Masiku ano zamagetsi anayamba mayendedwe kwambiri, imodzi mwa nkhalango - ndi kuchepetsa miyeso akukhudzidwira ndi kulemera kwa zipangizo. SMD-zigawo - chifukwa kukula awo, mtengo wotsika, mkulu khalidwe - nawo kufalikira yaikulu ndipo ayamba kuchotsa zinthu zimene Agiriki ndi kumam'phunzitsa waya.

chithunzi m'munsimu chikusonyeza SMD-resistors anayikidwa pa PCB lapansi. Mutha kuona kuti, chifukwa kukula ka zinthu akwaniritsa mkulu wazolongedza osalimba. Kawirikawiri zinthu ndi anaikapo mu tizibowo bolodi ndi SMD-resistors ali soldered ku malo padziko mabuku dera bolodi kukhudzana njira (Piglet), amenenso zimatithandiza kapangidwe ndi khamu la zipangizo wailesi-amagetsi. Ndi luso phiri ubwenzi zigawo zikuluzikulu wailesi chimatheka kubala matabwa kusindikizidwa dera si amgwirizano kokha, komanso Mipikisano magawo, kunja chokhala wosanjikiza mkate.

umatulutsa njira zotsatirazi mafakitale kupanga soldering SMD-zigawo: njira gulu zolankhulirana solder ntchito thermopaste wapadera (kamwazi ndi wothira solder ufa), kenako Makina malo mu zinthu kufunika kuphatikizapo SMD-resistors. Tsatanetsatane kutsatira solder phala Kenako anaika mu mtengo wapadera ng'anjo kumene usavutike kutentha anakhumba pa zimene solder chimasungunula mu phala ukuphwera kamwazi. Choncho mfundo ndi kutenga pa mpando. Kenako, PCB atachotsedwa ng'anjo ndi utakhazikika.

Pakuti zigawo soldering SMD mtundu kunyumba adzafunika zipangizo zotsatirazi: tweezers, ndi choboolera, pliers, kukuza galasi syringe ndi singano wandiweyani, chitsulo soldering ndi nsonga chabwino, otentha siteshoni mpweya soldering. Wa consumables zofunika solder, madzi kamwazi. Ndi zofunika, ndithudi, ntchito siteshoni soldering, koma ngati inu simutero, inu mukhoza ndi chitsulo soldering. Pamene soldering chinthu chachikulu - kupewa kutenthedwa zigawo zikuluzikulu ndi PCB. Nyengo unaima ndipo sanali ankadalira mbola ya soldering chitsulo, iwo ayenera mbamuikha pa bolodi singano.

SMD-resistors akupereka osiyanasiyana ndithu mfundo mwadzina kwa wina ndi makumi atatu Ohm megohm. Opaleshoni kutentha kwa resistors ndi zimasiyanasiyana -550 ° C kwa + 1250 ° C. Mphamvu SMD-resistor ukufika 1W. Ndi kuwonjezera mphamvu kuonjezera miyeso wonse. Mwachitsanzo, resistors SMD mphamvu 0,05 W ali miyeso 0.6 * 0,3 * 0.23 ndi mamilimita ndi mphamvu ya 1 W - 3.2 * 6.35 * 0.55 mm.

Chodetsa resistors awa akhoza kukhala a mitundu itatu: atatu manambala, zinayi manambala ndi zilembo zitatu:

- The manambala awiri oyambirira zimasonyeza mtengo wa mtengo resistor mu ohms, ndi wotsiriza - chiwerengero cha ziro. Mwachitsanzo, chodetsa pa resistor 102 ndi ohms 1000 kapena 1k.

- The woyamba manambala atatu a resistor limasonyeza kufunika mwadzina mu ohms, ndi wotsiriza - chiwerengero cha ziro. Mwachitsanzo, m'pamene resistor 5302 ndi 53 kohm.

- The zilembo ziwiri zoyambirira amasonyeza resistor phindu ohms mtengo mwadzina, anatengedwa kuchokera tebulo pamwamba, ndi khalidwe lomaliza limasonyeza mtengo multiplier: S = 10-2; R = 10-1; B = 10; C = 102; D = 103; E = 104; F = 105. Mwachitsanzo, m'pamene resistor 11C ndi 12,7 kohm.