SMD-resistors: tsananguro, Kunyora

SMD (the Surface akatasva mano ') rakashandurwa kuti Chirungu zvinoreva "mudziyo akatasva pemvura." SMD-zvinoriumba kagumi maduku kukura uye uremu pane kwakajairika zvikamu, nokudaro kuwana yepamusoro arambe achirema kuti kuwedzera pamusoro rakadhindwa redunhu bhodhi namano. Mazuvano Electronics yakatanga zvikuru kumhanya, mumwe munzvimbo - ndiko kuti kuderedza zvinonakisa kukura uye kurema namano. SMD-zvinoriumba - nokuda kukura kwavo, pasi cost, yepamusoro - vakanotora rakapararira huru uye vari kuramba vachiitsiva dzenhoroondo zvinhu pamwe waya zvinoisa.

The Photo pazasi inoratidza SMD-resistors anoiswa pamusoro pcb. Unogona kuona kuti, nokuda duku kukura okunze kubudirira refu chiputiriso arambe achirema. Kazhinji zvinhu zviri rakapinzwa mumakomba bhodhi uye SMD-resistors vari soldered kune nzvimbo pamusoro pemvura akadhindwa redunhu bhodhi kuonana nzira (Piglet), iyo nyore magadzirirwo uye neungano redhiyo-zvemagetsi. Vachikwanisa kubhururuka kuda redhiyo zvinoriumba unoitwa zvibvire kuti kubereka akadhindwa redunhu mapuranga havasi chete bilateral, asiwo multi-layered, akafanana kunze marongera keke.

zvinoberekwa anotevera nzira iri maindasitiri kugadzirwa pokunamatidza SMD-zvinoriumba: penzira bhodhi kukurukura solder vakashandisa chaiyo thermopaste (nekubudisa yakavhenganiswa solder upfu), pashure izvo robhoti ane nzvimbo iri kutsvakwa zvinhu kusanganisira SMD-resistors. Details vanoomerera kuti solder namatidza iri ipapo raizoiswa mhosva chaiyo sechoto umo neshungu kune kutsvakwa tembiricha panguva iyo solder inonyunguduka iri namatidza runopwa nekubudisa. Saka mashoko kuwana pachigaro. Zvadaro, mukuru pcb rinobviswa muchoto uye haachandidi.

For pokunamatidza SMD mhando zvinoumba mumba vachada zvinotevera zvokushandisa: tweezers, mutsunda, pingisi, kukudza girazi sirinji chiine tsono, mumwe pokunamatidza simbi ine muromo yakaisvonaka, mhepo inopisa pokunamatidza chechitima. Of consumables zvinodiwa solder, mvura nekubudisa. Zviri chinodiwa Chokwadi, kushandisa pokunamatidza yemapurisa, asi kana mukasadaro, unogona kuwana kupfurikidza aine pokunamatidza simbi. Kana pokunamatidza chikuru chinhu - kudzivirira overheating yenhengo uye pcb. To okunze haana kufamba uye haana kusiyana neuyo rumborera ane pokunamatidza simbi, vanofanira richingosimba tsono bhodhi.

SMD-resistors rinoratidza zvikuru zvakawanda chezita tsika kubva imwe matatu Ohm megohm. Uchishandisa tembiricha of resistors zvichisiyana -550 ° C kuti + 1250 ° C. Power SMD-resistor rinosvika 1W. By kuwedzera simba zvinowedzera zvinonakisa miganhu. Somuenzaniso, resistors SMD simba 0,05 W ane kukura 0,6 * 0.3 * 0.23 mm uye simba 1 W - 3.2 * 6.35 * 0.55 mm.

Chichatara resistors izvi zvinogona kuva mhando nhatu:-digit matatu, mana digit uye zvitatu kutaurwa:

- The digits maviri okutanga anoratidza kukosha resistor kukosha mune ohms, uye vokupedzisira - nhamba zeros. Somuenzaniso, zvichiratidza panguva resistor 102 ndiyo 1000 ohms kana 1LDK.

- The digits vatatu resistor rokutanga inoratidza aizviti anokoshesa ohms, uye vokupedzisira - nhamba zeros. Somuenzaniso, zvichiratidza resistor 5302 ndiyo 53 kohm.

- The Vatambi maviri okutanga anoratidza resistor anokoshesa ohms chezita kukosha, akatorwa kubva patafura kumusoro, uye yokupedzisira hunhu kunoratidza multiplier ukoshi: S = 10-2; R = 10-1; B = 10; C = 102; D = 103; E = 104; F = 105. Somuenzaniso, zvichiratidza resistor 11C ndiyo 12.7 kohm.