LEDs tau dav siv hauv cov khoom siv hluav taws xob niaj hnub. Ntawm lawv tsis tau pom zoo yog lawv qhov loj me thiab ci ci. Tab sis kom cov LED ua haujlwm kom raug, nws yog qhov tsim nyog los teeb nws txoj haujlwm tam sim no.
Tsim nyog
tester (multimeter)
Cov Lus Qhia
Kauj ruam 1
Cov LED tuaj yeem ua haujlwm tau zoo rau ntau xyoo, ib qho ntawm lawv poob sai yog tias lawv ua haujlwm ntawm lub zog tam sim no. Txhawm rau kom raug tseeb lub zog tam sim no, koj yuav tsum paub txog qhov voltage rau ib qho LED tshwj xeeb raug tsim.
Kauj ruam 2
Qhov muab cov voltage ntawm cov LED feem ntau tuaj yeem txiav txim siab los ntawm cov xim ntawm lawv lub teeb. Yog li, rau dawb, xiav thiab ntsuab LEDs, qhov ntsuas hluav taws xob feem ntau yog 3 V (txog 3.5 V yog qhov lees paub). Cov xim liab thiab daj yog tsim rau cov khoom xaib voltage ntawm 2 V (1, 8 - 2, 4 V). Feem ntau cov LEDs tau ntsuas rau 20mA, txawm hais tias muaj LEDs uas muaj peev xwm siab dua 150mA.
Kauj ruam 3
Nws yog qhov nyuaj los kwv yees cov nominal tam sim no ntawm cov tsis paub LED hauv qhov tsis muaj cov ntaub ntawv siv. Saib rau qhov muag teev - qhov loj dua nws yog, ntau dua qhov ib txwm tau ntsuas rau tam sim no. Ib qho ntawm cov phiajcim uas lub teeb tsa tam sim no siab dua qhov tau tso cai tam sim no tej zaum yuav muaj kev hloov pauv hauv cov xim ntawm lub teeb ci. Piv txwv, yog tias qhov emission ntawm ib lub LED dawb hloov xiav, tom qab ntawd lub zog tam sim no kom meej meej dhau dhau lawm.
Kauj ruam 4
Nco ntsoov tias LEDs rhiab heev rau overvoltage. Piv txwv li, ntsaws 2V LED rau hauv Circuit Court nrog ob lub 1.5V roj teeb hauv series (3V tag nrho) tuaj yeem hlawv nws.
Kauj ruam 5
Yog tias ib qho khoom siv hluav taws xob ntau dua qhov kev pom zoo raug siv, qhov ntau tshaj ntawm qhov yuav tsum tau tua nrog qhov sib ntxiv (damping) resistor. Koj tuaj yeem xam qhov tawm tsam ntawm qhov resistor uas siv tus qauv R = U / Kuv. Piv txwv li, koj yuav tsum siv hluav taws xob 3 V LED los ntawm lub tsheb 12 V ntawm tus tsav tsheb network. Koj muaj ib qho ntxiv 9 V. Nrog rau qhov ntsuas tam sim no ntawm 20 mA (0.02 A), koj yuav tau txais cov nqi xav tau los ntawm kev faib 9 los ntawm 0.02 - qhov no yuav yog 450 Ohm.
Kauj Ruam 6
Muaj kev sib sau ua ke hauv Circuit Court nrog LED, nco ntsoov ntsuas ntsuas tam sim no noj los ntawm nws los ntawm kev sib txuas lub tester rau qhib Circuit Court. Yog tias qhov tam sim no siab dua 20 mA, nws yuav tsum raug txo los ntawm nce tus nqi resistor. Ib qho qis me ntsis tam sim no - piv txwv li, 18 mA, yuav tsuas yog muaj txiaj ntsig ntawm LED, ua kom nws lub neej ntev dua.
Kauj Ruam 7
Nco ntsoov tias cov LED txuas nrog kom raug. Cov anode txuas nrog txuas ntxiv ntawm lub hwj chim sib txuas, cov cathode txuas nrog hauv kev rho tawm. Lub cathode muaj qhov luv luv txhuas; kev txiav yog txiav nyob rau sab ntawm lub khob haus dej (thaj chaw tiaj).
