Cov txheej txheem:
- Khoom siv
- Kauj Ruam 1: Tshem Koj Lub Teeb
- Kauj Ruam 2: Txiav txim siab seb LEDs Koj Xav Li Cas, Saib Cov Lus Qhia
- Kauj Ruam 3: Txiav txim siab Voltages
- Kauj Ruam 4: Xam Tus Tiv Thaiv rau Ib Leeg LED
- Kauj Ruam 5: Ntxiv LEDs ntau dua hauv Parallel
- Kauj Ruam 6: Ntxiv LEDs ntxiv hauv Series
- Kauj Ruam 7: Muab cov xim sib txawv LEDs
- Kauj Ruam 8: Ntxiv LEDs hauv Series THIAB Parallel
- Kauj Ruam 9: Muab Nws Rov Qab Ua Ke
Video: Retrofit LED Push Light: 9 Kauj Ruam (nrog Duab)
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:26
Txoj haujlwm no tau pib vim tias kuv muaj lub teeb nyem LED hauv kuv lub txee dai khaub ncaws uas tsis ci txaus rau kuv kom pom zoo. Kuv xav tias cov roj teeb tau qis dua, tab sis thaum kuv hloov lawv, nws tsis tau txais qhov ci dua! Kuv xav tias kuv yuav qhib lub teeb kom pom dab tsi tshwm sim sab hauv, thiab seb kuv puas tuaj yeem yooj yim ntxiv qee qhov LEDs kom nws ci dua. Tab sis tau kawg, cov xim LED ua rau txhua txoj haujlwm muaj kev lom zem dua, yog li kuv txiav txim siab ntxiv cov liab, ntsuab, thiab xiav LEDs dua. Qhov no zoo li yog lub sijhawm zoo tshaj plaws los sau ib yam dab tsi rau Kev Ua Nrog Lej Kev Sib Tw - yog tias koj tsis paub nrog Ohm Txoj Cai lossis yuav suav li cas tam sim no -txwv kev tiv thaiv tus nqi rau LED, Cov Lus Qhia no yuav qhia koj li cas.
Yog tias koj muaj lus nug, tsis txhob ua siab deb los tawm lus, thiab kuv yuav sim rov qab rau koj!
Khoom siv
- Lub roj teeb uas siv roj teeb, tseem hu ua lub teeb puck lossis lub teeb ci. Muaj nyob ntawm Amazon lossis ntawm cov khw muag khoom kho vajtse. Txoj haujlwm no yuav ua haujlwm nrog ob lub teeb LED tshiab thiab cov teeb ci qub.
- LEDs ntawm koj xaiv
- Assorted resistors - qhov tseem ceeb yuav nyob ntawm seb muaj pes tsawg lub roj teeb koj lub teeb siv thiab LEDs koj xaiv dab tsi (xam nws tawm yog ib feem ntawm Cov Lus Qhia no!)
- Koob qhov ntswg pliers
- Mini ntswj ntsia hlau teeb (qee zaum xav tau los sib nrug lub teeb)
- Soldering hlau (pom zoo)
- Multimeter (pom zoo)
Kauj Ruam 1: Tshem Koj Lub Teeb
Pib los ntawm disassembling koj lub teeb. Feem ntau koj yuav xav tau lub taub hau me me los ua qhov no los ntawm kev tshem lub nraub qaum. Sab hauv qhov no peb tuaj yeem pom lub voj voog yooj yim suav nrog lub roj teeb txuas, khawm, LED, thiab tus tiv thaiv. Lub teeb hluav taws xob hluav taws xob yuav zoo ib yam, tab sis yuav tsis muaj qhov tiv thaiv - yog li koj yuav xav tau ntxiv ib qho yog tias koj tab tom hloov mus rau LEDs.
Kauj Ruam 2: Txiav txim siab seb LEDs Koj Xav Li Cas, Saib Cov Lus Qhia
Muaj ntau ntau yam sib txawv ntawm LEDs tawm muaj, thiab lawv tuaj hauv txhua qhov xim sib txawv. Koj yuav tsum txiav txim siab pes tsawg thiab LEDs xim twg koj xav siv. Qhov yooj yim tshaj plaws ua yog tej zaum yuav ntxiv ntau LEDs ntawm tib xim nyob rau hauv parallel. Yog tias koj xav ntxiv LEDs hauv kab lossis sib xyaw xim, koj yuav tsum ua lej me ntsis ntxiv - tab sis qhov ntawd Cov Lus Qhia no yog rau! Peb yuav hla txhua qhov xwm txheej.
Thaum koj tau txiav txim siab txog LEDs, koj yuav tsum tau saib lawv cov nqi hluav taws xob poob qis thiab mus rau qhov ntsuas tam sim no. Cov ntaub ntawv no feem ntau muaj nyob hauv lub vev xaib uas koj yuav cov LEDs lossis hauv cov ntawv teev npe. 5mm LEDs zoo li cov duab hauv qab no yog ntau heev, thiab feem ntau lawv tau ntsuas nyob rau tam sim no ntawm 20mA. Lub zog hluav taws xob poob qis los ntawm kwv yees li 2V-4V thiab nyob ntawm cov xim.
Kauj Ruam 3: Txiav txim siab Voltages
Yog tias koj tsis muaj multimeter, tom kawg ntawm qhov tsawg kawg koj yuav tsum txiav txim siab qhov hluav taws xob ntawm koj lub teeb lub roj teeb. Paub txog qhov hluav taws xob ntawm koj lub roj teeb pob yuav tsum tau los suav qhov tam sim no-txwv kev tiv thaiv. Koj tuaj yeem ua qhov no los ntawm suav cov roj teeb. Ib qho alkaline AA (lossis AAA) roj teeb muab txog 1.5V, siab dua me ntsis thaum lawv nyob tshiab. Thaum koj muab cov roj teeb ua ke, qhov hluav taws xob ntxiv. Yog li hauv qhov no, nrog plaub lub roj teeb AA tshiab, Kuv yuav tsum cia siab tias tsuas yog ntau dua 6V.
Yog tias koj muaj lub multimeter ua ke, nws tsis tuaj yeem mob los ntsuas qhov ntsuas ib yam. Ua qhov no thaum LED qhib. Hauv qhov no koj tuaj yeem pom kuv tau txais 6.26V los ntawm lub roj teeb, thaum kuv muaj 3.26V poob ntawm LED thiab 2.98V poob ntawm tus tiv thaiv. Nws yog qhov nthuav kom nco ntsoov tias kuv tab tom poob yuav luag ib nrab ntawm kuv qhov hluav taws xob hla tus tiv thaiv - uas yog lub zog nkim ntau heev! Ntxiv rau qhov ntawd tom qab. Yog tias koj tsis xav zoo li nyeem cov cai xim, koj tseem tuaj yeem ntsuas qhov tsis kam ntawm koj tus tiv thaiv - ua qhov no thaum LED tawm.
Yog tias koj tsis paub yuav siv lub multimeter li cas, muaj ntau qhov kev qhia zoo nyob rau ntawd, ntawm Instrucables thiab lwm qhov. Kuv ua qhov no.
Kauj Ruam 4: Xam Tus Tiv Thaiv rau Ib Leeg LED
Ua ntej peb mus ntxiv, cia peb piav qhia yuav ua li cas los xam tus nqi tiv thaiv rau ib qho LED. Tus tiv thaiv yog tswj hwm los ntawm Ohm Txoj Cai, uas hais tias V = IR, lossis
Sib npaug 1: Voltage [volts] = Tam sim no [amps] x Kuj [ohms]
Qhov hluav taws xob ntawm koj lub roj teeb thiab qhov hluav taws xob poob thoob plaws LED yog (kwv yees) tas li. Yog li hauv Circuit Court saum toj no, qhov poob qis hla tus tiv thaiv yog
Sib npaug 2: Vresistor = Vbatt-VLED
Txuas qhov ntawd rau hauv Ohm Txoj Cai rau tus tiv thaiv muab rau peb:
Sib npaug 3: Vbatt-VLED = IR
Yog tias peb muaj lub hom phiaj tam sim no rau LED - hu nws ILED - tom qab ntawd peb paub txhua yam hauv Tshooj 3 tshwj tsis yog rau kev ua haujlwm. Peb tuaj yeem rov kho qhov sib npaug los daws rau R:
Sib npaug 4: R = (Vbatt-VLED)/ILED
Yog li, piv txwv li, hais tias peb muaj 2xAA roj teeb pob (uas muab 3V), lub teeb liab liab nrog rau qhov tso hluav taws xob poob qis ntawm 1.8V, thiab peb xav tau 20mA los ntawm LED. Plugging cov lej hauv kab zauv 4 muab rau peb:
R = (3V-1.8V) /0.02A = 60 Ω
Cov neeg tiv taus zoo li tuaj hauv qhov txiaj ntsig txaus luag - yog li qhov sib txawv yog koj tsis muaj 60Ω tus tiv thaiv tso ib puag ncig. Ntawd yog qhov twg paub yuav ua li cas ua ke cov resistors hauv koob thiab sib luag los ua ke. Txawm li cas los xij, nws tsis ua li cas yog tias koj tsis tau txais qhov tseeb 20mA los ntawm LED - "ze txaus" yog tej zaum zoo rau feem ntau siv!
Thaum kawg, nws yog qhov kev nkag siab yuam kev uas tus tiv thaiv xav tau los ua ntej LED thiaj li yuav poob qhov hluav taws xob lossis txwv qhov tam sim no. Qhov ntawd tsis yog qhov tseeb - nws hloov tawm lub resistor tuaj yeem tso tom qab LED hloov pauv. Saib cov vis dis aus piav qhia vim li cas qhov tseeb ntawm no.
Kauj Ruam 5: Ntxiv LEDs ntau dua hauv Parallel
Cia peb pib nrog cov ntaub ntawv yooj yim tshaj plaws: koj tsuas yog xav ntxiv ntau lub LEDs ntawm cov xim tib yam ua ke kom ua rau koj lub teeb ci dua. Nws yuav yog qhov txaus siab tsuas yog ntxiv LEDs ncaj qha ua ke nrog ib qho uas twb muaj lawm, ua kom muaj kev tiv thaiv ib leeg. Qhov no ua haujlwm, zoo li koj tuaj yeem pom hauv cov duab saum toj no - tag nrho peb LEDs teeb - tab sis muaj teeb meem! Qhov tam sim no dhau los ntawm tus tiv thaiv ib leeg tsis hloov pauv tiag tiag thaum koj ntxiv ntau LEDs ua ke. Txij li cov LEDs nyob ua ke, qhov tam sim no los ntawm ib tus tiv thaiv ib leeg yuav faib sib npaug ntawm lawv. Yog li ua ntej, qhov twg kuv muaj 20mA los ntawm ib qho LED, tam sim no kuv tsuas yog tau txais txog 20/3 = 6.67mA dhau los ntawm txhua LED - thiab lawv yuav tsis zoo li!
Hloov chaw, yog tias koj ntxiv ib tus neeg tawm tsam hauv koob nrog txhua LED, tom qab ntawd koj yuav tau txais tag nrho cov nyiaj tam sim no los ntawm txhua LED. Qhov tsis zoo yog qhov no yuav ntws koj lub roj teeb peb zaug sai dua. Qhov no tsis yog qhov teeb meem loj hauv kuv rooj plaub vim tias kuv tau teeb lub teeb nyob hauv lub txee dai khaub ncaws, thiab yuav tsis siv nws ntau zaus.
Yog li yog tias koj ua raws txoj hauv kev no, koj tau zam kev ua lej - koj tsuas xav tau ob peb qho ntxiv ntawm tib tus tiv thaiv. Hauv kuv qhov xwm txheej, kuv muaj 100Ω tus tiv thaiv thiab LED dawb - Kuv tsuas xav tau ob qho ntxiv ntawm txhua qhov kom tau txais tag nrho ntawm peb LEDs ua ke. (Hmoov tsis zoo kuv tsis nco qab thaij duab ntawm cov kauj ruam ntawd, ua ntej kuv hloov mus rau xim LEDs).
Kauj Ruam 6: Ntxiv LEDs ntxiv hauv Series
Yuav ua li cas txog kev ntxiv LEDs ntxiv hauv koob? Qhov kev xaiv no ua haujlwm yog tias koj lub roj teeb pob hluav taws xob siab txaus. LEDs yuav tsis qhib txhua yog tias lub roj teeb pob hluav taws xob qis dua qhov lawv xav tau rau qhov poob qis. Ib yam li nrog roj teeb, thaum koj ua ke LEDs hauv koob, lawv qhov hluav taws xob ntxiv. Hauv kuv qhov xwm txheej, kuv lub LED dawb muaj qhov poob qis ntawm 3.4V, yog li tso ob qho hauv kab yuav xav tau 6.8V - ntau dua li kuv lub roj teeb pob tau muab. Txawm li cas los xij, piv txwv li, koj tuaj yeem ua nws nrog ob (lossis txawm tias peb) liab LEDs. Yog tias txhua tus liab LED muaj qhov poob qis ntawm 2V thiab koj xav tau tam sim no ntawm 20mA, uas yuav ua rau koj muaj tus tiv thaiv tus nqi R = (6 - 4) / 0.02 = 100Ω. Sib piv qhov ntawd tsuas yog tso ib qho liab LED nyob hauv Circuit: R = (6 - 2) / 0.02 = 200Ω. Los ntawm kev ntxiv LED thib ob hauv koob, koj tau txo qis qhov loj me ntawm tus tiv thaiv - tab sis koj tseem tsuas yog kos 20mA, yog li koj tsis tso koj lub roj teeb nrawm dua! Koj tau ua rau lub zog ua haujlwm tau zoo dua vim tias koj tab tom tshaj tawm lub zog tsawg hauv tus tiv thaiv. Qhov ntawd coj mus rau lwm qhov sib npaug - rau tus tiv thaiv, lub zog sib npaug sib npaug tam sim no tiv thaiv lub sijhawm, lossis
P = kuv^2*R
Yog li 20mA los ntawm 200Ω resistor dissipates 80mW, whereas 20mA los ntawm 100Ω resistor tsuas yog dissipates 40mW.
(dua, thov txim uas kuv tsis muaj daim duab ntawm qhov piv txwv no - Kuv tau mus rau qhov xim LEDs ua ke)
Kauj Ruam 7: Muab cov xim sib txawv LEDs
Yog tias koj xav kom sib xyaw xim sib txawv LEDs, koj muaj ob txoj hauv kev:
- Hlau lawv hauv kab - qhov no ua haujlwm ntev li ntev tau tag nrho cov hluav taws xob poob qis hauv LEDs tsawg dua li cov roj teeb pob (saib cov kauj ruam dhau los).
- Hlau lawv nyob rau hauv parallel, txhua tus nrog lawv tus kheej resistor - piv txwv tias koj xav kom txhua lub LEDs kom muaj tib yam tam sim no yog li lawv yuav zoo ib yam ci ci, koj tsuas yog xam tus nqi tiv thaiv sib cais rau txhua LED, muab nws rau pem hauv ntej qhov hluav taws xob poob.
Qee lub sij hawm nws yooj yim dua rau kev tsim cov kab hluav taws xob zoo li qhov no ntawm lub khob cij ua ntej (yog tias koj tsis paub siv lub khob cij, txheeb xyuas qhov kev qhia no). Ib zaug ntxiv, koj yuav tsis muaj qhov ntsuas qhov tseeb uas koj xav tau yooj yim, yog li koj tuaj yeem ua si ib puag ncig nrog kev sib txuas sib txawv hauv koob/ua ke kom ua kom zoo dua koj qhov ci. Hauv qhov no, Kuv muaj lub roj teeb 4xAA muab txog 6V, thiab liab, ntsuab, thiab xiav LEDs nrog qhov poob qis txog li 2V, 2V, thiab 3V feem. Qhov ntawd ua rau kuv muaj tus tiv thaiv tus nqi R = (6-2) /0.02 = 200Ω rau cov liab thiab ntsuab LEDs, thiab 150Ω rau lub xiav LED. Kuv tsis muaj cov txiaj ntsig tseeb muaj, tab sis kuv tuaj yeem tsim 200Ω resistor los ntawm kev sib txuas ob 100Ω resistors hauv koob, thiab kuv tuaj yeem tau "ze txaus" rau 150Ω resistor los ntawm kev sib txuas 100Ω resistor thiab 47Ω resistor hauv series.
Kauj Ruam 8: Ntxiv LEDs hauv Series THIAB Parallel
Hnov taug txuj kev nyuaj thiab xav ua qhov no tiag tiag ci? Ntxiv LEDs hauv series THIAB ua ke! Ib zaug ntxiv, nco ntsoov tias txhawm rau ntxiv LEDs hauv koob, koj lub roj teeb hluav taws xob xav tau siab dua li qhov sib npaug ntawm LED qhov poob qis; thiab yog tias koj ntxiv LEDs ua ke, nws yuav ua rau lub roj teeb nrawm dua. Ua qhov kev xam cais rau tus nqi tiv thaiv rau txhua pawg LEDs hauv koob.
Kauj Ruam 9: Muab Nws Rov Qab Ua Ke
Kev tsim qauv rau ntawm lub khob cij, nrog cov yeeb yaj kiab, lossis los ntawm kev khoov ua ke nrog pliers yog ib txoj hauv kev zoo sim tawm txawv LED/resistor sib txuas ua ntej koj ua tiav koj qhov kev tsim. Thaum koj ua tiav txhua yam, siv cov LEDs thiab cov tshuaj tiv thaiv ua ke yuav pab tuav lawv thaum koj rov teeb dua. Qee daim kab xev lossis kua nplaum kub tuaj yeem pab tiv thaiv lawv kom tsis txhob txav mus los. Nrog cov liab-ntsuab-xiav LEDs, Kuv yuav tsum tau disassemble thiab rov ua nws ob peb zaug kom txog thaum kuv tau txais cov LEDs teeb tsa xws li lawv tau muab cov txiaj ntsig sib npaug sib npaug rau tag nrho peb xim. Cov khoom kawg ntawm no tej zaum yuav tsis muaj txiaj ntsig zoo hauv kuv lub txee dai khaub ncaws, tab sis nws zoo li txias dua!
Khiav Tawm Hauv Kev Ua Nrog Math Contest
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