Muaj ntau qhov tsis sib xws ntawm cov resistor, feem ntau peb feem ntau txhawj xeeb txog tus nqi, qhov tseeb, tus nqi ntawm lub zog, peb qhov ntsuas no tsim nyog.Nws yog qhov tseeb tias nyob rau hauv digital circuits, peb tsis tas yuav xyuam xim rau ntau cov ntsiab lus, tom qab tag nrho, tsuas muaj 1 thiab 0 hauv cov digital, tsis suav ntau qhov cuam tshuam me me.Tab sis nyob rau hauv analog circuits, thaum peb siv ib tug meej voltage qhov chaw, los yog analog-rau-digital hloov dua siab tshiab ntawm cov teeb liab, los yog amplify ib tug tsis muaj zog teeb liab, ib tug me me kev hloov nyob rau hauv tus nqi kuj yuav muaj kev cuam tshuam zoo.Nyob rau hauv lub sij hawm ntawm pounding nrog lub resistor, ntawm chav kawm, yog nyob rau hauv lub sij hawm ntawm ua analog teeb liab, thiab tom qab ntawd, raws li cov analog Circuit Court daim ntaub ntawv los soj ntsuam qhov cuam tshuam ntawm txhua qhov parameter ntawm tus resistor.
Tus nqi ntawm cov nqi ntawm cov resistor - tus nqi ntawm cov nqi ntawm cov resistor xaiv feem ntau yog kho los ntawm daim ntawv thov, xws li LED teeb tam sim no txwv, los yog ib tug tam sim no lub teeb liab sampling, tus nqi ntawm cov resistor yeej tsis muaj lwm yam kev xaiv.Tab sis qee zaus, muaj ntau yam kev xaiv rau cov resistor, xws li amplification ntawm ib tug voltage teeb liab, raws li qhia nyob rau hauv daim duab, lub amplification muaj feem xyuam rau tus piv ntawm R2 rau R3, thiab tsis muaj dab tsi ua rau tus nqi R2 thiab R3.Nyob rau lub sijhawm no, qhov kev xaiv ntawm kev tiv thaiv ntawm cov resistor tseem yog raws li: qhov ntau dua qhov kev tiv thaiv ntawm cov resistor, lub suab nrov thermal ntau dua, qhov kev ua haujlwm ntawm lub amplifier yog qhov tsis zoo;qhov me me ntawm cov resistor, qhov ua haujlwm ntau dua yog qhov tam sim no, lub suab nrov dua tam sim no, qhov ua haujlwm ntawm lub amplifier tsis zoo;qhov no yog vim li cas vim li cas ntau lub amplification circuits yog kaum ntawm K tsis kam, yuav tsum tau siv ib tug loj kuj tus nqi, los yog siv voltage raws, los yog siv T-networks kom tsis txhob.
Tsis-Inverting Amp
Lub precision ntawm tus resistor - qhov precision ntawm tus resistor yog to taub zoo, ntawm no tsis verbose.Resistor qhov tseeb yog feem ntau 1% thiab 5%, precision mus rau 0.1%, thiab lwm yam. Tus nqi ntawm 0.1% yog li kaum npaug ntau dua 1%, thiab 1% yog li 1.3 npaug ntau dua 5%.Feem ntau, qhov tseeb code A = 0.05%, B = 0.1%, C = 0.25%, D = 0.5%, F = 1%, G = 2%, J = 5%, K = 10%, M = 20%.
Lub hwj chim ntawm lub resistor - lub hwj chim ntawm tus resistor yuav tau yooj yim heev, tab sis feem ntau yooj yim rau siv tsis raug.Piv txwv li, 2512 nti resistor, lub zog quota yog 1W, raws li qhov tshwj xeeb ntawm cov resistor, qhov kub siab tshaj 70 degrees Celsius, tus resistor yuav tsum tau txo kom siv.2512 nti resistor thaum kawg yuav siv tau ntau npaum li cas, nyob rau hauv chav tsev kub, yog hais tias lub PCB pads tsis muaj tshwj xeeb tshav kub dissipation kev kho mob, 2512 nti resistor hwj chim rau 0.3W, qhov kub tej zaum yuav ntau tshaj 100 los yog txawm 120 degrees Celsius..Nyob rau hauv 125 degrees Celsius kub, raws li qhov kub thiab txias derating nkhaus, tus nqi ntawm 2512 lub zog yuav tsum tau derated mus rau 30%.Qhov teeb meem no nyob rau hauv tej pob resistors yuav tsum tau them sai sai rau, tsis txhob ntseeg hais tias nyob rau hauv lub nominal hwj chim, txoj hauj lwm tseem ceeb yog qhov zoo tshaj plaws los mus xyuas ob zaug kom tsis txhob tawm hauv cov teeb meem zais.
Resistor withstand voltage tus nqi - resistor withstand voltage tus nqi yog feem ntau hais tsawg, tshwj xeeb tshaj yog rau cov neeg tuaj tshiab, feem ntau muaj me ntsis tswv yim, xav tias capacitors tsuas muaj tus nqi voltage.Qhov hluav taws xob uas tuaj yeem siv rau ob qho kawg ntawm qhov resistor, ib qho yog txiav txim siab los ntawm tus nqi ntawm lub zog, kom ntseeg tau tias lub hwj chim tsis tshaj lub hwj chim, lwm qhov yog qhov tsis kam ntawm tus nqi hluav taws xob resistor.Txawm hais tias lub zog ntawm lub cev resistor tsis tshaj qhov ntsuas lub zog, qhov siab dhau ntawm qhov hluav taws xob tuaj yeem ua rau cov resistor tsis ruaj khov, creepage ntawm resistor pins, thiab lwm yam tsis ua haujlwm, yog li nws yuav tsum tau xaiv qhov tsim nyog resistor raws li qhov voltage siv.Qee qhov ntawm cov khoom siv hluav taws xob muaj xws li: 0603 = 50V, 0805 = 100V, 1206 txog 2512 = 200V, 1/4W plug-in = 250V.Thiab, kev siv lub sij hawm, qhov hluav taws xob ntawm lub resistor yuav tsum me dua li cov quota withstand voltage ntau tshaj 20%, txwv tsis pub nws yog ib qho yooj yim kom muaj teeb meem tom qab lub sij hawm ntev.
Kub coefficient ntawm tsis kam - Qhov kub coefficient ntawm tsis kam yog ib qho parameter uas piav qhia txog qhov kev hloov ntawm qhov tsis kam nrog qhov kub thiab txias.Qhov no feem ntau yog txiav txim los ntawm cov khoom ntawm cov resistor, feem ntau tuab zaj duab xis nti resistor 0603 pob saum toj no tuaj yeem ua 100ppm / ℃, txhais tau hais tias cov resistor ambient kub hloov ntawm 25 degrees Celsius, tus nqi kuj yuav hloov los ntawm 0.25%.Yog tias nws yog 12-ntsis ADC, qhov hloov pauv 0.25% yog 10 LSB.Yog li ntawd, rau ib qho op-amp zoo li AD620, uas tso siab rau tsuas yog ib qho resistor los kho qhov amplification, ntau tus qub engineers yuav tsis siv nws kom yooj yim, lawv yuav siv ib tug pa Circuit Court los kho qhov amplification los ntawm qhov piv ntawm ob resistors.Thaum cov resistors yog tib hom resistors, qhov kev hloov pauv ntawm cov nqi kuj tshwm sim los ntawm qhov kub thiab txias yuav tsis ua rau muaj kev hloov pauv ntawm qhov sib piv, thiab lub Circuit Court yuav ruaj khov dua.Hauv kev xav tau ntau dua qhov ntsuas ntsuas, cov yeeb yaj kiab hlau yuav raug siv, lawv qhov kub thiab txias mus rau 10 txog 20ppm yog ib qho yooj yim, tab sis tau kawg, nws kuj tseem kim dua.Nyob rau hauv luv luv, nyob rau hauv lub precision daim ntaub ntawv ntawm lub ntsuas chav kawm ntawv, qhov kub thiab txias coefficient yog twv yuav raug hu ib tug tseem ceeb parameter, qhov kev tiv thaiv yog tsis muaj tseeb yuav kho cov tsis nyob rau hauv tsev kawm ntawv, qhov kev hloov nyob rau hauv tsis kam nrog rau sab nraud kub yog tsis tswj.
Cov qauv ntawm cov resistor - cov qauv ntawm cov resistor yog ntau, ntawm no hais txog daim ntawv thov uas tuaj yeem xav txog.Qhov pib resistor ntawm lub tshuab feem ntau yog siv los them ua ntej lub peev xwm loj aluminium electrolytic, thiab tom qab ntawd kaw lub relay tig lub zog tom qab sau cov txhuas electrolytic.Qhov no resistor yuav tsum tau poob siab resistant, thiab nws yog qhov zoo tshaj plaws los siv ib tug loj wirewound resistor.Tus nqi ntawm lub zog ntawm cov resistor tsis tseem ceeb heev, tab sis lub zog tam sim no siab, thiab cov resistors zoo tib yam yog qhov nyuaj kom ua tau raws li qhov yuav tsum tau ua.Cov ntawv siv hluav taws xob siab, xws li cov resistors rau capacitor tawm, qhov twg qhov kev khiav hauj lwm voltage tshaj 500V, nws yog qhov zoo tshaj plaws los siv high voltage vitreous enamel resistors es tsis yog cov cement resistors.Spike absorption daim ntaub ntawv, xws li silicon tswj modules ntawm ob hnub yuav tsum tau mus rau tib lub RC kom nqus, ua dv / dt tiv thaiv, nws yog qhov zoo tshaj plaws kom ua tiav cov tsis-inductive wirewound resistors, thiaj li muaj kev nqus zoo ntawm spikes thiab tsis yooj yim. puas los ntawm kev poob siab.
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Post lub sij hawm: May-19-2022