Cov txheej txheem:
- Khoom siv
- Kauj ruam 1: Tsim Circuit Court
- Kauj ruam 2: Tsim Circuit Court
- Kauj Ruam 3: Muab lub Circuit hauv lub thawv
Video: Transistor LED Dimmer: 3 Kauj Ruam
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:26
Cov lus qhia no qhia koj yuav ua li cas kom yooj yim transistor LED dimmer.
Muaj lwm txoj hauv kev pheej yig dua:
hackaday.io/page/6955-recycled-light-dimme…:
Txawm li cas los xij, kev sib txuas hauv kab ntawv txuas saum toj no tsuas tuaj yeem tsav lub zog qis thiab qis zog LED teeb. Lub voj voog no tuaj yeem tsav tam sim no ntau dua thiab muaj zog dua LEDs. Txawm li cas los xij, txawm tias lub voj voog no muaj qhov txwv. Lwm cov LED dimmers tau qhia ntawm no:
www.instructables.com/id/LM350-Power-Suppl…
www.instructables.com/id/Transistor-Light-…
www.instructables.com/id/Oscillator-LED-Di…
Khoom siv
Qhov chaw: LED ci - 2 (koj tsuas xav tau ib qho tab sis koj tuaj yeem hlawv ib qho thiab cov kab hluav taws xob tuaj yeem tsav ntau dua ib qho LED), cov tshuaj tiv thaiv uas tau pom hauv Circuit Court, daim ntawv duab los qhia lossis lub rooj tsav xwm, 1kohm lossis 10 kohm potentiometer, lub zog siv (AA lossis AAA cov roj teeb thiab cov roj teeb), PNP lossis NPN BJT transistor, cov cua sov, cov cua sov hloov pauv, cov xov hlau thaiv lossis 1 hli hlau xaim.
Cov cuab yeej: xov hlau tripper, pliers, txiab.
Yeem qhov chaw: cov laug, lub thawv (lossis duab los qhia).
Yeem cov cuab yeej: cov hlau txuas, ntau lub ntsuas.
Kauj ruam 1: Tsim Circuit Court
Lub Circuit Court qhia yog rau PNP transistor. Koj tuaj yeem siv NPN transistor yog tias koj tig lub voj voog rov qab. Lub davhlau ya nyob twg emitter yog qhia cov kev taw qhia ntawm lub hauv paus thiab emitter tam sim no.
Cov hluav taws xob ib txwm ntws los ntawm lub roj teeb tsis zoo mus rau lub dav hlau roj teeb zoo. Txawm li cas los xij, peb tuaj yeem xav txog qhov kev tshuaj xyuas niaj hnub no kom yooj yim rau peb tsim. Peb xav tias muaj ib yam zoo li tam sim no pom uas ntws los ntawm lub roj teeb zoo mus rau lub dav hlau roj teeb tsis zoo.
Hauv PNP transistor:
- tam sim no ntws los ntawm emitter mus rau tus neeg sau khoom.
- lub hauv paus tam sim no ntws tawm ntawm transistor.
Hauv NPN transistor:
- qhov tam sim no ntws los ntawm tus sau rau emitter, - lub hauv paus tam sim no ntws sab hauv lub transistor.
Tus neeg khaws khoom tam sim no (transistor tso zis tam sim no) yuav tsum yog 10 mA vim tias qhov no yog qhov tsawg kawg tam sim no uas peb cov LED xav tau (qee qhov loj dua thiab ci dua LEDs xav tau 15 mA lossis txawm tias 20 mA). Piv txwv tias qhov tsawg kawg tam sim no tau txais yog 20 qhov tam sim no nkag mus rau hauv lub hauv paus transistor yog 500 uA lossis 0.0005 A.
Yog li peb tuaj yeem suav Rb resistor.
RbMax = (Vs - Vbe) / IbMin = 2.3 V / 0.0005 A = 4600 ohms lossis 4.7 kohms
Piv txwv tias peb xav ntxiv ib qho LED ntxiv nrog rau 100-ohm resistor nyob rau hauv parallel lossis ob LEDs nyob rau hauv sib npaug nrog 50 ohm Rd resistor (nco ntsoov tias yog tias ob lub LEDs tau muab tso rau hauv ib qho ib qho yuav tsaus me ntsis dua lwm qhov). Tom qab ntawd cov zis tam sim no yuav yog 20 mA. Yog li peb yuav tsum xam tus nqi siab tshaj Rb rau qhov sib txawv tso tawm tam sim no lossis ntau qhov sib txawv ntawm LEDs txuas nrog lub transistor.
Ic = 20 mA: RbMax = 2.3 V / 0.001 A = 2300 ohms lossis 2.2 kohms
Ic = 40 mA: RbMax = 2.3 V / 0.002 A = 1150 ohms lossis 1 kohms
Qhov siab tshaj plaws tam sim no tso tawm yog 40 mA rau cov hom phiaj dav dav transistors. Yog li peb yuav tsum tsis txhob txo tus nqi Rb qis dua 1 kohms, tshwj tsis yog peb siv lub zog transistor. Txawm li cas los xij, tom qab ntawd peb yuav tsum txo Rv kom tsawg kawg 500 ohms thiab qhov no yuav ua rau lub zog poob.
Tus nqi siab tshaj plaws kom tsim nyog rau ib qho 10 mA LED tso tawm yog 20 kohms. Rau qhov muaj zog ntau dua qhov ntsuas, LED yuav tsis tig mus txog thaum koj mus txog li 99 % ntawm kev teeb tsa puv puv. Qhov no yuav tsis yog kev tswj kab tawm. Kuv kuj yog vim li cas kuv thiaj tsis siv MOSFET lossis JFET transistors rau hauv Circuit no. Cov transistors no tsis yog linear, tshwj xeeb tshaj yog MOSFETs.
Kuv tau kos lub Circuit hauv PSpice software qub los txo lub sijhawm kos. Lub teeb ci LED tau ua qauv nrog peb lub hom phiaj dav dav vim tias cov software no tsis muaj cov khoom siv LED.
Kauj ruam 2: Tsim Circuit Court
Kuv tsis tau siv lub raj hlau. Kuv muab cov xov hlau sib dhos ua ke. Koj tuaj yeem tsim lub voj voog no ntawm ib daim duab los lossis yas. Cardboard zoo dua yas. Koj tuaj yeem tsim lub zes noog zes hluav taws xob. Txawm li cas los xij, qhov Circuit no tsis txaus ntseeg tshwj tsis yog tias koj ua kom nws ruaj khov rau cov khoom siv nyuaj xws li ntoo lossis ntim ua npuas ncauj. Txawm li cas los xij, qhov kev xaiv zoo tshaj plaws yog pawg thawj coj saib hauv kuv lub tswv yim thiab qhov kev xaiv tsis zoo yog ua PCB (luam tawm lub rooj tsav xwm hauv Circuit Court).
Kauj Ruam 3: Muab lub Circuit hauv lub thawv
Kuv siv lub thawv ntawv thawv. Koj tuaj yeem siv lub thawv yas lossis lub thawv noj su. Txawm li cas los xij, lub thawv ntawv thawv yog qhov kev xaiv zoo tshaj plaws thiab koj tsis xav tau lub thawv.
Pom zoo:
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