Xaiv Tus Tiv Thaiv Siv Nrog LEDs: 3 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:31

Cov lus nug no tau nug txhua hnub hauv Cov Lus Teb thiab Cov Rooj Sib Tham: Kuv siv tus tiv thaiv dab tsi nrog kuv cov LEDs? Yog li kuv tau muab tso ua ke ob peb txoj hauv kev sib txawv los txiav txim siab. Los ua kom raug rau nws: Txhua kauj ruam ua tib yam nkaus. Kauj Ruam 1 yog qhov yooj yim tshaj plaws thiab peb nqis los ntawm qhov ntawd. Tsis muaj leej twg xaiv txoj hauv kev uas koj xaiv koj yuav tsum xub paub peb yam no:

• Muab qhov hluav taws xob Qhov no yog ntau npaum li cas lub zog koj tab tom tso rau hauv Circuit Court. Cov roj teeb thiab cov phab ntsa hauv pob txha yuav muaj qhov hluav taws xob tso tawm ntawm lawv ib qho. Yog tias koj siv ntau lub roj teeb^*, ntxiv qhov hluav taws xob ua ke.
• LED Voltage Qee zaum "Forward Voltage" tab sis feem ntau tsuas yog sau luv "V".
• LED Tam Sim No Qee Zaug "Forward Current". Qhov no tau teev tseg hauv milliamps lossis "mA".

Ob qho ntawm ob qhov kawg no tuaj yeem pom ntawm lub ntim rau koj li LEDs lossis ntawm koj tus neeg muag khoom lub vev xaib. Yog tias lawv teev ntau ("20-30mA") xaiv tus nqi hauv nruab nrab (25 hauv qhov no). Nov yog qee qhov txiaj ntsig zoo, tab sis siv koj tus kheej qhov tseem ceeb kom ntseeg tau tias koj tsis hlawv koj cov LEDs!: Liab LED: 2V 15mAGreen LED: 2.1V 20mABlue LED: 3.2V 25mAWhile LED: 3.2V 25mAOkay, cia pib ua!^* Roj teeb hauv koob. ^{Taw qhia cov duab khab nias:LED yees duab los ntawm Luisanto.Resistor yees duab los ntawm oskay.}

Kauj ruam 1: Web Way

Txoj hauv kev yooj yim tshaj plaws yog siv ib qho ntawm cov lej hauv online uas tau muab hauv qab no. Koj tsuas yog yuav tsum mus rau ib qho. Qhov LED Center (Rau ib qho LEDs) Lub LED Center (Rau cov kab ntawm LEDs) LED Calculator.net (Rau ib lossis ib pawg ntawm LEDs) LED Calculator.com (Rau ib lossis ib pawg ntawm LEDs)

Kauj Ruam 2: Txoj Kev Retro

Mus rau Evil Mad Scientist Labs lub vev xaib ntawm qhov txuas no thiab luam tawm thiab ua koj tus kheej txoj cai swb-zoo li lub laij lej. tuaj yeem khaws ib qho hauv lub thawv ntawd nrog koj cov LEDs tas.

Kauj Ruam 3: Txoj Kev Nyuaj (Lej!)

Txhua lub laij lej hauv qib 2 tsuas yog ua qee qhov lej yooj yim uas koj tuaj yeem ua hauv tsev: Cov lej los laij tawm tsam hauv Circuit Court yog: R = V/I lossis, muaj feem cuam tshuam nrog qhov peb tab tom ua: (Source Volts - LED Volts) / (Tam sim no / 1000) = Kuj^*Yog li yog tias peb muaj 12v roj teeb ua kom muaj 3.5V 25mA LED peb cov mis ua: (12 - 3.5) / (25 /1000) = 340ohms. Tab sis tos! (koj yuav hais) Thaum kuv siv ib qho ntawm lwm lub laij lej kuv tau 390 ohms! Thiab qhov tseeb koj ua. Qhov ntawd vim tias nws nyuaj rau yuav 340 ohm resistor thiab yooj yim mus yuav 390 ohm ib qho. Tsuas yog siv qhov ze tshaj plaws uas koj tuaj yeem nrhiav tau yooj yim. Yog xav paub ntau ntxiv txog cov mis mos no nyeem txog Ohms Law.^* Peb tab tom faib tam sim no los ntawm 1000 vim tias peb cov npe hauv miliaps, lossis 1/1000^{th ua} ntawm amp.