Siv AC Nrog LEDs (Ntu 1): 5 Kauj Ruam

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

Tsis ntev los no kuv tau hla qhov kev hloov pauv zoo muag rau qis dua $ 1.00. Yog vim li cas lawv thiaj pheej yig yog qhov tseeb tias lawv cov zis tsuas yog AC, thaum cov khoom siv feem ntau xav tau lim zoo DC.

Cov Lus Qhia no tau muab tso ua ke nrog lub hom phiaj kom tau txais AC-hloov pauv ua haujlwm nrog LEDs yam tsis muaj diodes thiab cov capacitors. Kuv yuav qhia cov lej lej txaus ntawm no yog li lub tswv yim siv rau feem ntau lwm yam AC-tsuas yog hloov pauv. Qhov txaus siab, ntau tus Dub & Decker Dust-Buster hloov pauv yog AC nkaus xwb, thiab lawv tau haum zoo rau kev hloov pauv, txij li ntau tus tsuas yog siv 1/2 ntawm cov zis (ib nrab yoj kho).

Kauj Ruam 1: Ua Tus Zauv

Qhov kev hloov pauv tau ua rau ntau lub AT & T lub xov tooj tsis muaj tes, nws tau ntsuas rau 110v/60Hz thiab muaj 10VAC 500mA tso tawm.

Ua ntej, peb yuav tsum paub tias qhov ntsuas 10V paub tias yog RMS qhov hluav taws xob, thiab yog qhov muaj zog nruab nrab ntawm sine-wave. Qhov siab tshaj plaws, uas peb yuav hais txog peb cov LEDs, yog li 1.4 npaug siab dua. Peb tuaj yeem pom qhov no los ntawm kev sib txuas peb lub tshuab hloov pauv thiab ntsuas qee qhov ntsuas. Daim duab thib ob qhia txog 10.8 VAC, uas tso tawm qhov tso tawm ntawm tus hloov pauv. Yog li peb yuav tsum cia siab tias qhov siab tshaj ntawm 1.4 x Vrms lossis 15.3v Tom ntej no peb ntxiv cov diode yooj yim nrog lub tshuab ua kom du thiab ntsuas qhov ntsuas hluav taws xob hla nws: 14.5VDC. Tus lej no yog kwv yees li.8v tsawg dua peb qhov kev suav vim tias lub diode muaj qhov poob hluav taws xob hla nws ntawm.8V Qhov no yog ib qho laj thawj peb sim ua kom tsis txhob diodes vim tias txhua tus ib txwm poob (raws li cua sov) me ntsis ntawm lub zog -.8v yog 25 % ntawm lub zog rau 3.2v LED. Yog li, peb yuav siv 15.3 volt los ua lub hauv paus peb kev suav.

Kauj Ruam 2: Tau Teeb

Peb paub tias feem ntau dawb thiab xiav (thiab UV) LEDs nyob nruab nrab ntawm 3 thiab 3.6 volts. Yog li los ntawm kev faib peb PEAK qhov hluav taws xob los ntawm qhov nruab nrab LED qhov hluav taws xob, peb tau txais lub tswv yim ntawm cov lej ntawm peb lub tshuab hluav taws xob tuaj yeem txhawb nqa: 15.3 / 3.3 = 4.6, uas peb hloov mus txog 5, muab txog 3.1v rau ib lub teeb. Tab sis nco ntsoov, tias AC muaj lub voj voog NEGATIVE zoo ib yam! Qhov ntawd txhais tau tias peb tuaj yeem ntxiv daim iav iav uas ua haujlwm ntawm lwm qib. Qhov zoo ntawm kev siv hluav taws xob los pib peb cov kev suav yog tias, tsuav peb nyob nrog cov LEDs zoo sib xws, thiab nyob hauv nws cov hluav taws xob ua haujlwm, tam sim no yuav nyob hauv qhov txwv tsis pub muaj kev nyab xeeb. Yog li, los ntawm kev kho tus lej ntawm LEDs hauv kev siv, peb tuaj yeem daws cov AC hloov pauv feem ntau tam sim no tam sim tshuaj xyuas qhov nrawm pom tias nws tseem nyob ntawm 10.8VAC. Peb cov LEDs tsuas yog siv ib feem me me (4%) ntawm 500mA lub peev xwm ntawm kev hloov pauv uas … Peb tuaj yeem muab cov teeb pom kev tawm mus txog 15 zaug tsuas yog ntxiv cov saw ntawm 10-LEDs teeb tsa tib txoj kev hla cov khoom! Xav txog kev khiav 150 LEDs hauv qhov dav dav tawm ntawm ib qho kev hloov pauv me me. Ntshiab yooj yim ncaj qha tsav txhua txoj kev.

Kauj Ruam 3: Qhov Pitfalls

Ib qho kev tiv thaiv yog tias peb tau txwv kev tsav tsheb rau peb LEDs mus rau qib nyab xeeb - nws tsuas yog mus txog nws qhov ntsuas siab tshaj ib zaug ib zaug. Qhov tseeb nws yuav raug tshem tawm tag thaum cov saw hlau tawm tsam. Yog li peb tuaj yeem cia siab tias yuav muaj sia nyob ntev los ntawm txoj kev npaj no.

Qhov tseeb tias txhua txoj saw hlau raug kaw rau ib nrab lub sijhawm txhais tau tias yuav muaj qee qhov flicker, uas koj tuaj yeem pom hauv cov duab hauv qab no, nqa nrog lub kaw ceev ceev. Los ntawm kev hloov pauv thiab tawm kab, cov txiaj ntsig tau raug txo qis, thiab tsis muaj qhov phem dua li siv teeb pom kev zoo.

Kauj ruam 4: Qee qhov kev hloov pauv

Qee zaum, koj tsis tuaj yeem tau txais tus lej raug ntawm 3.5v LEDs rau yam koj xav tau. Tom qab ntawd koj tuaj yeem 'dag' los ntawm kev hloov lub amber LED hauv txhua txoj saw - lawv ua haujlwm ib puag ncig 2.4 volts, yog li tso cai rau koj fudge koj tus lej me ntsis.

Thiab hais txog cov hmoov av -busters - yog tias koj siv peb txoj hauv kev rau lawv cov phab ntsa -warts thaum lub chaw them nyiaj, koj yuav pom tau tias ib txoj saw ntawm LEDs tsis tau teeb - qhov no yog vim lawv tsuas yog siv ib nrab ntawm lawv cov Circuit los them rau chav tsev. Xav txog kev siv lwm tus ib nrab ntawm lub voj voog rau LEDs ua lub zog dawb. Koj tseem tuaj yeem hloov txoj hauv kev no rau DC cov khoom siv - tab sis nco ntsoov tias koj ib txwm ntsuas qhov tso tawm thawj zaug ua ntej! Cov chav ua lag luam muaj npe tsis zoo rau kev suav tus lej.

Kauj ruam 5: Rov ua dua

Yog li, txhawm rau nrhiav seb dab tsi hloov pauv tuaj yeem txhawb nqa: Ntsuas nws cov zis: - Yog tias nws yog AC, siv V -AC nplai ntawm koj lub multimeter, thiab muab cov txiaj ntsig los ntawm 1.4 kom tau V -ncov - Yog tias nws yog DC, siv V-DC nplai nyeem tawm V-ncov. Lub naj npawb ntawm cov dawb (lossis xiav) LEDs nws tuaj yeem txhawb nqa yog:-Vpeak / 3.3 thiab hloov mus rau tus lej tom ntej. (Piv txwv 4.2 yog 5) (Siv V-ncov / 2 rau Liab, Txiv kab ntxwv thiab daj LEDs) Qhov ntawd yog tus lej ntawm cov LED koj tuaj yeem tso ua ke kom ua haujlwm tawm ntawm lub tshuab hluav taws xob kom nyab xeeb. cov saw hauv qhov tsis sib thooj. LEDs tuaj yeem yog ib qho tam sim no, tsuav yog lawv zoo ib yam, thiab cov hloov pauv muaj qhov tam sim no (A lossis mA) los txhawb nws. tsuas yog faib tus lej los ntawm cov volts kom tau txais amps.- xaus ntawm Ntu 1 - (Txuas ntxiv ntawm no)