350 Watt Self Oscillating Class D Amplifier: 8 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:27

Kev taw qhia thiab vim li cas kuv thiaj ua cov lus qhia no:

Hauv is taws nem, muaj ntau pab qhia uas qhia tib neeg txog kev tsim lawv tus kheej chav kawm D li cas amplifiers. Lawv muaj txiaj ntsig, nkag siab yooj yim, thiab txhua tus siv tib yam topology. Muaj qhov sib npaug ntawm daim duab peb sab siab tau tsim los ntawm ib feem ntawm Circuit Court, thiab nws tau sib piv nrog lub teeb liab los hloov cov hloov pauv (yuav luag ib txwm MOSFETs) qhib thiab tawm. Feem ntau ntawm cov "DIY Class D" tsim qauv tsis muaj kev tawm tswv yim, thiab cov uas tsuas yog ua suab huv hauv cheeb tsam ntses bass thaj tsam. Lawv ua qee qhov siv tau subwoofer amplifiers, tab sis muaj qhov cuam tshuam loj hauv cheeb tsam treble. Cov uas tsis muaj kev tawm tswv yim, vim yog lub sijhawm tuag yuav tsum tau rau MOSFET hloov pauv, muaj cov txheej txheem tsim tawm uas zoo li zoo li daim duab peb sab yoj, tsis zoo li lub sine wave. Qhov tsis xav tau kev sib haum xeeb tseem ceeb tam sim no, ua rau muaj kev txo qis hauv lub suab zoo uas ua rau lub suab paj nruag suab zoo ib yam li nws los ntawm lub suab raj. Lub suab trumpety me ntsis, tsis yog-punchy suab ntawm kuv yav dhau los chav kawm D amplifier yog vim li cas kuv txiav txim siab los tshawb fawb thiab tsim lub tshuab raj siv qhov tsis meej pem, tsis siv cov topology.

Txawm li cas los xij, qhov qub "daim duab peb sab yoj piv" tsis yog tib txoj hauv kev los tsim chav kawm D amplifier. Muaj txoj hauv kev zoo dua. Es tsis txhob muaj tus oscillator hloov lub teeb liab, vim li cas ho tsis ua kom tag nrho lub tshuab hluav taws xob oscillator? Qhov tso tawm MOSFETs tau tsav (los ntawm kev tsim hluav taws xob tsim hluav taws xob) los ntawm kev tso tawm ntawm tus sib piv nrog cov lus pom zoo tau txais lub suab nkag thiab cov lus tsis pom zoo tau txais (txo qis) version ntawm lub tshuab hluav taws xob tso tawm qhov hluav taws xob. Hysteresis tau siv hauv kev sib piv los tswj cov zaus ntawm kev ua haujlwm thiab tiv thaiv tsis ruaj tsis khov, cov qauv siv zaus ntau zaus. Tsis tas li ntawd, RC snubber network tau siv thoob qhov tso tawm los txhawm rau txhawm rau lub suab nrov ntawm cov lim lim tawm suab thiab txo qis theem ua haujlwm kom ze rau 90 degrees ntawm lub tshuab ua haujlwm lub zog ua haujlwm ib puag ncig 100 Khz. Kev tso tawm ntawm qhov yooj yim tab sis qhov lim dej tseem ceeb yuav ua rau lub tshuab hluav taws xob ua rau nws tus kheej puas tsuaj, vim tias qhov hluav taws xob ntawm ob peb puas volts tuaj yeem tsim tawm, rhuav tshem cov lim dej tam sim ntawd.

Lub hauv paus ntsiab lus ntawm kev ua haujlwm:

Xav tias lub suab nrov tau pib ua ntej thiab txhua qhov hluav taws xob nyob ntawm xoom. Vim nws yog hysteresis, tus sib piv yuav txiav txim siab los rub qhov tawm los yog qhov zoo lossis tsis zoo. Rau qhov ua piv txwv no, peb yuav xav tias tus sib piv rub cov zis tsis zoo. Tsis pub dhau ob peb kaum ntawm microseconds, qhov hluav taws xob tso tawm ntawm lub tshuab hluav taws xob tau txo qis txaus kom tig tus neeg sib piv thiab xa qhov hluav taws xob rov qab mus dua, thiab lub voj voog no rov ua dua ib puag ncig 60 txog 100 txhiab zaus txhua ob, ua kom muaj qhov xav tau ntawm qhov tso tawm. Vim lub lim inductor lub siab impedance thiab lim capacitor tus impedance tsawg ntawm qhov zaus no, tsis muaj suab nrov ntau ntawm cov zis, thiab vim muaj qhov ua haujlwm siab, nws nyob deb tshaj qhov hnov tau. Yog tias qhov hluav taws xob nkag tau nce, qhov hluav taws xob tso tawm yuav nce txaus uas cov lus tawm tswv yim nce mus txog qhov tso zis hluav taws xob. Li no txoj kev ua kom tiav tau tiav.

Qhov zoo tshaj tus qauv chav kawm D:

1. Tsis tshua muaj qhov tso tawm qhov tsis txaus ntseeg: Vim tias cov zis MOSFETs yuav tsis hloov rov qab kom txog thaum qhov xav tau qhov hluav taws xob tso tawm tom qab lub lim tau mus txog, qhov cuam tshuam ntawm qhov tso tawm yog qhov zoo. Txawm tias muaj 0.1 qhov sib txawv ntawm qhov xav tau tiag tiag thiab qhov xav tau qhov hluav taws xob, lub Circuit Court yuav pov tseg amps rau hauv qhov tso tawm kom txog thaum qhov hluav taws xob tig tus sib piv rov qab (lossis qee yam tshuab).

2. Muaj peev xwm ua kom huv huv ua rau muaj kev cuam tshuam ntau ntxiv: Vim qhov tsis tshua muaj txiaj ntsig tso tawm tsis zoo, tus kheej-oscillating chav kawm D tuaj yeem tsav ntau txoj hauv kev hais lus tshuab nrog loj impedance dips thiab peaks nrog me ntsis harmonic distortion. Ported subwoofer systems uas muaj qhov cuam tshuam tsawg ntawm qhov chaw nres nkoj qhov cuam tshuam ntau zaus yog tus piv txwv tseem ceeb ntawm tus hais lus uas tawm tswv yim-tsawg dua "daim duab peb sab yoj sib piv" lub zog yuav tawm tsam kom tsav tau zoo.

3. Cov lus teb dav dav: Raws li qhov nce ntxiv, lub tshuab ua kom nrov nrov yuav ua kom them nyiaj los ntawm kev hloov pauv lub luag haujlwm ntau dua kom ua kom cov lus tawm tswv yim sib phim nrog cov hluav taws xob nkag. Vim yog lub lim qhov ua kom qis qis, cov zaus ntau yuav pib kaw ntawm qib qis dua qhov qis dua, tab sis vim yog cov nkauj muaj ntau lub zog hluav taws xob ntau hauv cov ntses bass thaj tsam ntau dua li cov suab paj nruag (kwv yees li 1/f faib, ntau dua yog tias koj siv ntses bass thaj tsam txhawb nqa), qhov no tsis yog qhov teeb meem dab tsi.

4. Kev ruaj khov: Yog tsim kom raug thiab nrog kev sib txuas sib txuas hauv qhov chaw, ze li ntawm 90 ° theem ntawm cov lim tawm ntawm qhov ua haujlwm zaus kom ntseeg tau tias lub tshuab ua kom nrov nrov yuav tsis hloov pauv, txawm tias tsav tsheb hnyav hauv qab hnyav clipping. Koj yuav tshuab ib yam dab tsi, zoo li koj tus neeg hais lus lossis qis dua, ua ntej lub amp tsis ruaj khov.

5. Kev ua tau zoo thiab qhov loj me: Vim yog kev tswj tus kheej ntawm lub tshuab hluav taws xob, ntxiv sijhawm ntau rau MOSFET hloov pauv qhov hloov pauv tsis cuam tshuam rau lub suab zoo. Kev ua haujlwm puv ntoob ntawm qhov zoo tshaj ntawm 90% tuaj yeem ua tau nrog qhov ua tau zoo thiab MOSFETs (Kuv siv IRFB4115s hauv kuv lub tshuab ua kom nrov). Raws li qhov tshwm sim, lub dab dej kub me me ntawm FETs yog qhov txaus thiab lub kiv cua tsuas yog xav tau yog tias ua haujlwm sab hauv lub thaiv thaiv ntawm lub zog siab.

Kauj Ruam 1: Cov Khoom, Cov Khoom Siv, thiab Yam yuavtsum tau kawm uantej

Yam yuavtsum tau kawm uantej:

Tsim txhua yam kev siv hluav taws xob zoo, tshwj xeeb tshaj yog ib qho tsim los ua kom huv huv suab, xav tau kev paub txog cov tswv yim hluav taws xob yooj yim. Koj yuav tsum paub yuav ua li cas capacitors, inductors, resistors, MOSFETs, thiab op-amps ua haujlwm nrog rau yuav ua li cas thiaj tsim tau lub hwj chim tuav tswj lub rooj tsav xwm. Koj kuj yuav tsum paub yuav ua li cas thiaj li hla dhau cov khoom sib dhos thiab yuav siv cov kab txaij (lossis tsim PCB). Cov ntawv qhia no yog npaj rau cov tib neeg uas tau tsim cov teeb meem nyuaj me ntsis ua ntej. Tsis tas yuav tsum muaj kev paub zoo sib xws, vim tias feem ntau ntawm cov subcircuits hauv ib chav kawm D amplifier cuam tshuam nrog tsuas yog ob qib hluav taws xob - qhib lossis tawm.

Koj kuj tseem yuav tsum paub siv lub oscilloscope (tsuas yog lub hauv paus tseem ceeb) thiab yuav ua li cas debug cov kab hluav taws xob uas tsis ua haujlwm raws li lub hom phiaj xav tau. Nws yog qhov yuav tshwm sim, nrog lub voj voog ntawm qhov nyuaj no, uas koj yuav xaus nrog cov kab hauv qab uas tsis ua haujlwm thawj zaug koj tsim nws. Nrhiav thiab kho qhov teeb meem ua ntej hloov mus rau kauj ruam tom ntej, debugging ib ntu-ntu yog yooj yim dua li sim nrhiav qhov txhaum nyob qhov twg hauv tag nrho pawg thawj coj saib. Kev siv oscilloscope yog qhov tsim nyog los nrhiav qhov tsis xav tau oscillation thiab txheeb xyuas tias cov cim qhia zoo li cas lawv yuav tsum tau ua.

Cov Lus Qhia dav dav:

Ntawm txhua chav kawm D lub tshuab hluav taws xob, koj yuav muaj qhov siab thiab qhov hloov pauv ntawm qhov ntau zaus, uas muaj peev xwm ua kom muaj suab nrov zoo. Koj tseem yuav muaj lub zog hluav taws xob qis uas cuam tshuam rau lub suab nrov thiab yuav khaws thiab nthuav nws. Cov theem tawm tswv yim thiab theem zog yuav tsum nyob ntawm qhov kawg ntawm pawg thawj coj saib.

Cov av zoo, tshwj xeeb tshaj yog nyob rau theem fais fab, tseem yog qhov tseem ceeb. Nco ntsoov tias cov xov hlau hauv av khiav ncaj qha los ntawm lub davhlau ya nyob twg tsis zoo mus rau txhua tus neeg tsav tsheb thiab tus sib piv. Nws nyuaj rau muaj cov xov hlau hauv av ntau dhau. Yog tias koj ua qhov no ntawm daim phiaj hluav taws xob luam tawm, siv lub dav hlau hauv av rau hauv av.

Qhov koj yuav xav tau:

(Qhia rau kuv yog tias kuv tsis muaj dab tsi, Kuv zoo nkauj heev qhov no yog daim ntawv teev npe tiav)

(Txhua yam hais tias HV yuav tsum tau ntsuas kom tsawg kawg qhov txhawb zog kom tsav tus hais lus, nyiam dua)

(Ntau yam no tuaj yeem khaws tau los ntawm cov khoom siv hluav taws xob thiab khoom siv pov tseg hauv lub thoob khib nyiab, tshwj xeeb tshaj yog cov khoom siv hluav taws xob)

• 24 volt fais fab tuag muaj peev xwm ntawm 375 watts (Kuv siv lub roj teeb lithium, yog tias siv lub roj teeb kom ntseeg tau tias koj muaj LVC (txiav hluav taws xob qis))
• Txhawb lub zog hloov pauv muaj peev xwm muab 350 watts ntawm 65 volts. (Tshawb "Yeeco lub zog hloov pauv 900 watts" ntawm Amazon thiab koj yuav pom qhov kuv siv.)
• "Perf board" lossis pawg thawj coj los tsim txhua yam ntawm. Kuv pom zoo kom muaj tsawg kawg 15 square inches los ua haujlwm nrog rau txoj haujlwm no, 18 yog tias koj xav tsim lub rooj tsav xwm nkag ntawm tib lub rooj tsavxwm.
• Heatsink los teeb tsa MOSFETs rau
• 220uf Capacitor Cov
• 2x 470uf Capacitor, ib qho yuav tsum tau ntsuas rau qhov ntsuas hluav taws xob (tsis yog HV)
• 2 x 470nf Capacitor
• 1 x 1 nf Capacitor
• 12x 100nf Ceramic Capacitor (lossis koj tuaj yeem siv poly)
• 2x 100nf Poly capacitor [HV]
• 1x 1 uf Poly capacitor [HV]
• 1x 470uf LOW ESR Electrolytic capacitor [HV]
• 2x 1n4003 diode (txhua lub diode uas tuaj yeem tiv taus 2*HV lossis ntau dua yog qhov zoo)
• 1x 10 amp fuse (lossis luv thooj ntawm 30AWG xaim hla lub davhlau ya nyob twg thaiv)
• 2x 2.5mh inductor (lossis cua koj tus kheej)
• 4x IRFB4115 Hwj chim MOSFET [HV] [Yuav tsum yog GENUINE!]
• Cov neeg tawm tsam ntau yam, koj tuaj yeem tshem lawv tawm ntawm eBay lossis Amazon rau ob peb nyiaj
• 4x 2k Trimmer potentiometers
• 2x KIA4558 Op amp (lossis zoo ib yam suab op amps)
• 3x LM311 sib piv
• 1x 7808 tus tswj hluav taws xob
• 1x "Lm2596" buck converter board, koj tuaj yeem pom lawv ntawm eBay lossis Amazon rau ob peb qho nyiaj
• 2x NCP5181 lub rooj tsav tsheb IC (koj yuav tshuab qee yam, tau txais ntau dua) [Yuav tsum yog GENUINE!]
• 3-tus pin header txuas rau lub rooj tsavxwm (lossis ntau tus pin rau cov khoom siv dag zog)
• Cov xov hlau lossis cov dav hlau thaiv rau cov neeg hais lus, lub zog, thiab lwm yam
• 18AWG fais fab hlau (rau thaiv lub zog theem)
• 22 AWG sib txuas hlau (rau txuas txhua yam ntxiv)
• 200 ohm lub zog qis lub suab hloov pauv rau theem nkag
• Me 12v/200ma (lossis tsawg dua) khoos phis tawj cua txias kom txias zog (yeem)

Cov cuab yeej thiab khoom siv:

• Oscilloscope tsawg kawg 2us/div daws teeb meem nrog 1x thiab 10x sojntsuam (koj tuaj yeem siv 50k thiab 5k resistor los ua koj tus kheej 10x sojntsuam)
• Multimeter uas tuaj yeem ua hluav taws xob, tam sim no thiab tsis kam
• Solder thiab soldering hlau (Kuv siv Kester 63/37, ZOO ZOO ZOO TSHAJ pub dawb kuj ua haujlwm yog tias koj muaj kev paub dhau los)
• Solder sucker, wick, thiab lwm yam.
• Cov hlau txiav thiab cov txiab
• Ib yam dab tsi uas tuaj yeem tsim lub voj voos ntawm ob peb HZ, zoo li lub khob cij thiab lub sijhawm 555

Kauj Ruam 2: Kawm Yuav Ua Li Cas Tus Kheej Ua Haujlwm Hauv Chav D Ua Haujlwm (xaiv tau Tab sis Pom Zoo)

Ua ntej koj pib, nws yog lub tswv yim zoo kom paub tias qhov kev ua haujlwm hauv Circuit Court ua haujlwm li cas. Nws yuav pab tau zoo nrog txhua yam teeb meem uas koj yuav muaj ntxiv rau, thiab yuav pab koj nkag siab tias txhua feem ntawm tag nrho cov phiaj xwm ua dab tsi.

Thawj daim duab yog daim duab tsim los ntawm LTSpice qhia lub tshuab raj teb rau qhov hloov pauv qhov hluav taws xob tam sim ntawd. Raws li koj tuaj yeem pom los ntawm kab ntawv, kab ntsuab sim ua raws txoj kab xiav. Sai li qhov kev hloov pauv hloov pauv, txoj kab ntsuab nce nrawm dua li nws tuaj yeem ua tau thiab txiav txim siab nrog qhov qis tshaj. Kab liab yog qhov hluav taws xob ntawm theem tso tawm ua ntej lub lim. Tom qab qhov kev hloov pauv, lub tshuab ua kom nrov nrov sai sai thiab pib oscillating ncig lub teeb taw tes ib zaug ntxiv.

Daim duab thib ob yog daim duab qhia chaw yooj yim. Lub suab tawm tswv yim yog sib piv nrog cov lus tawm tswv yim, uas tsim lub teeb liab los tsav cov theem tso tawm kom coj cov zis los ze zog rau cov tswv yim. Hysteresis hauv kev sib piv ua rau lub voj voog nyob ib puag ncig qhov xav tau qhov hluav taws xob ntawm qhov zaus ntau dhau rau pob ntseg lossis hais lus los teb rau.

Yog tias koj muaj LTSpice, koj tuaj yeem rub tawm thiab ua si ib puag ncig nrog.asc schematic file. Sim hloov r2 txhawm rau hloov pauv zaus thiab saib cov kab hluav taws xob vwm thaum koj tshem lub snubber uas ua rau muaj kev sib kis ntau dhau ib puag ncig LC lim lub ntsiab lus resonance.

Txawm hais tias koj tsis muaj LTSpice, kawm cov duab yuav muab tswv yim zoo rau koj tias txhua yam ua haujlwm li cas. Tam sim no cia peb mus rau lub tsev.

Kauj Ruam 3: Tsim Cov Khoom Siv Hluav Taws Xob

Ua ntej koj pib soldering ib yam dab tsi, ua tib zoo saib cov txheej txheem thiab piv txwv txheej txheem. Cov txheej txheem yog SVG (duab nraaj duab) yog li thaum koj rub tawm nws koj tuaj yeem nthuav dav ntau npaum li koj xav tau yam tsis poob qhov kev daws teeb meem. Txiav txim siab qhov twg koj yuav tso txhua yam ntawm lub rooj tsavxwm, thiab tom qab ntawd tsim lub zog siv hluav taws xob. Nqa cov roj teeb hluav taws xob thiab hauv av thiab xyuas kom tsis muaj dab tsi kub. Siv lub ntsuas ntsuas ntsuas los kho "lm2596" pawg thawj coj los tso tawm 12 volts thiab xyuas tias 7808 tus tswj hwm tau tso tawm 8 volts.

Nov yog nws rau lub hwj chim muab.

Kauj Ruam 4: Tsim Lub Sijhawm Tso Tawm thiab Tus Tsav Tsheb Rooj

Ntawm tag nrho cov txheej txheem tsim, qhov no yog qhov nyuaj tshaj plaws ntawm lawv txhua tus. Ua txhua yam hauv "Rooj vag tsav tsheb hauv Circuit" thiab "Power stage" hauv qhov txheej txheem, ua kom ntseeg tau tias FETs txuas nrog lub rhaub dej kub.

Hauv qhov txheej txheem, koj yuav pom cov xov hlau uas zoo li tsis mus qhov twg thiab hais tias "vDrv". Cov no hu ua cov ntawv lo hauv schmatic thiab txhua daim ntawv lo nrog tib cov ntawv tau txuas ua ke. Txuas txhua qhov ntawm "vDrv" daim ntawv lo xov hlau rau qhov tso tawm ntawm 12v tus tswj hwm pawg thawj coj saib.

Tom qab ua tiav theem no, ua kom lub zog hluav taws xob tam sim no nrog cov khoom siv tam sim no (koj tuaj yeem siv cov tshuaj tiv thaiv nyob rau hauv ua ke nrog cov khoom siv hluav taws xob) thiab xyuas kom tsis muaj dab tsi kub. Sim sib txuas txhua qhov ntawm cov lus qhia nkag mus rau lub rooj tsav tsheb mus rau 8v los ntawm cov khoom siv hluav taws xob (ib qho zuj zus) thiab txheeb xyuas tias lub qhov rooj raug raug tsav. Thaum koj tau txheeb xyuas tias koj paub tias lub rooj tsav tsheb ua haujlwm.

Vim yog lub rooj vag tsav siv lub kaw lus khau raj, koj tsis tuaj yeem ntsuas qhov tso tawm ncaj qha los ntawm kev ntsuas qhov tso tawm qhov hluav taws xob. Muab lub multimeter tso rau ntawm diode kos thiab txheeb xyuas ntawm txhua lub dav hlau hais lus thiab txhua lub davhlau ya nyob twg.

1. Zoo rau Tus Hais Lus 1
2. Zoo rau Tus Hais Lus 2
3. Tsis zoo rau Tus Hais Lus 1
4. Tsis zoo rau Tus Hais Lus 2

Txhua tus yuav tsum qhia ib nrab kev coj ua ib txoj hauv kev, ib yam li diode.

Yog tias txhua yam ua haujlwm, zoo siab nrog koj tau ua tiav qhov nyuaj tshaj plaws ntawm pawg thawj coj. Koj nco qab qhov tsim nyog hauv av, txoj cai?

Kauj Ruam 5: Tsim MOSFET Gate Gate Signal Generator

Thaum koj tau ua tiav lub rooj tsav tsheb thiab theem fais fab, koj tau npaj los tsim ib feem ntawm qhov Circuit Court uas tsim cov cim qhia uas qhia rau cov neeg tsav tsheb lub rooj vag tias FETs qhib rau lub sijhawm twg.

Ua txhua yam hauv "MOSFET tus tsav tsheb teeb liab lub sijhawm tuag" hauv cov txheej txheem, ua kom ntseeg tau tias koj tsis hnov qab ib qho ntawm cov khoom me me. Yog tias koj tso tseg lawv, lub Circuit Court tseem yuav ntsuas tau zoo, tab sis yuav tsis ua haujlwm zoo thaum koj sim tsav tus neeg hais lus vim yog cov sib piv sib kis ua tsis tau zoo.

Tom ntej no, sim lub Circuit Court los ntawm kev pub zaub mov ib puag ncig ntawm ob peb hertz rau hauv "MOSFET tus tsav tsheb teeb liab lub sijhawm tuag" los ntawm koj lub tshuab hluav taws xob teeb tsa lossis 555 timer Circuit. Txuas lub roj teeb hluav taws xob rau "HV hauv" los ntawm qhov txwv tam sim no.

Txuas lub oscilloscope rau tus hais lus tawm. Koj yuav tsum tau txais lub roj teeb qhov hluav taws xob thim rov qab ob peb zaug ib pliag. Tsis muaj dab tsi yuav tsum tau sov thiab qhov tsim tawm yuav tsum yog qhov zoo, ntse square nthwv dej. Kev ntsuas me ntsis yog qhov zoo, tsuav nws tsis ntau dua 1/3 roj teeb hluav taws xob.

Yog tias cov zis tsim tawm ib puag ncig huv huv, nws txhais tau tias txhua yam koj tau tsim kom deb li deb tau ua haujlwm. Tsuas yog ib txoj kab hluav taws xob sab laug kom txog thaum ua tiav.

Kauj Ruam 6: Sib Piv, Qhov Sib Txawv Sib Txawv, thiab Lub Sijhawm Ntawm Qhov Tseeb

Tam sim no koj tau npaj los tsim ib feem ntawm Circuit Court uas ua tau raws qib D kev hloov pauv.

Ua txhua yam hauv "Kev Sib Piv nrog hysteresis" thiab "Qhov sib txawv ntawm lub tshuab hluav taws xob rau kev tawm tswv yim" hauv cov txheej txheem, nrog rau ob lub 5k resistors uas ua rau lub Circuit ruaj khov thaum tsis muaj kev txuas nrog cov tswv yim.

Txuas lub zog rau hauv Circuit Court (tab sis tseem tsis tau HV) thiab xyuas tias tus pin 2 thiab 3 ntawm U6 yuav tsum ob leeg nyob ze rau ib nrab ntawm Vreg (4 volts).

Yog tias ob qho ntawm cov txiaj ntsig no raug, txuas lub subwoofer hla cov chaw tso tawm. sib txuas lub zog thiab HV hauv lub roj teeb hluav taws xob los ntawm qhov txwv tam sim no (koj tuaj yeem siv 4 ohm lossis ntau dua subwoofer ua tus tiv thaiv). Koj yuav tsum hnov lub suab paj nruag me me thiab lub subwoofer yuav tsum tsis txhob txav mus rau ib txoj kev lossis lwm qhov ntau dua li ib millimeter lossis ntau dua. Txheeb nrog lub oscilloscope kom ntseeg tau tias cov cim qhia nkag mus thiab tawm ntawm NCP5181 lub rooj tsav tsheb tau huv thiab muaj ib puag ncig 40% kev ua haujlwm txhua lub hlis. Yog tias qhov no tsis yog, kho ob qhov sib txawv resistors kom txog thaum lawv yog. Qhov zaus ntawm lub qhov rooj tsav nthwv dej yuav qis dua qhov xav tau 70-110 KHZ vim HV tsis txuas nrog lub zog hluav taws xob.

Yog hais tias lub qhov rooj tsav cov cim qhia tsis oscillating txhua, sim hloov SPK1 thiab SPK2 mus rau qhov sib txawv amplifier. Yog tias nws tseem tsis ua haujlwm, siv lub oscilloscope los tshuaj xyuas qhov ua txhaum. Nws yuav luag yeej nyob hauv qhov sib piv lossis qhov sib txawv amplifier Circuit.

Thaum lub voj voog ua haujlwm, tso tus neeg hais lus txuas nrog thiab ntxiv qhov ntsuas hluav taws xob txhawm rau txhawm rau txhawb qhov hluav taws xob mus rau HV hauv ib puag ncig 65-70 volts (nco ntsoov lub fuse). Fais fab lub Circuit Court, thiab ua kom ntseeg tau tias tsis muaj dab tsi kub thaum pib, tshwj xeeb tshaj yog MOSFETs thiab inductor. Txuas ntxiv saib xyuas qhov kub thiab txias li 5 feeb. Nws yog qhov ib txwm rau cov inductor kom sov, tsuav nws tsis kub dhau los kov tsis tu ncua. MOSFETS yuav tsum tsis muaj ntau dua li sov me ntsis.

Txheeb xyuas qhov zaus thiab lub luag haujlwm ntawm lub rooj vag tsav tsis tau dua. Kho rau 40% lub voj voog ua haujlwm thiab xyuas kom muaj zaus nyob nruab nrab ntawm 70 thiab 110 Khz. Yog tias nws tsis yog, kho R10 hauv cov txheej txheem los kho qhov zaus. Yog tias qhov zaus raug, koj npaj tau pib ua suab nrog lub tshuab ua kom nrov.

Kauj Ruam 7: Kev Tawm Suab thiab Xeem Kawg

Tam sim no tias lub tshuab hluav taws xob nws tus kheej tau ua haujlwm txaus siab, nws yog lub sijhawm los tsim cov theem nkag. Ntawm lwm lub rooj tsavxwm (lossis ib yam yog tias koj muaj chaw nyob), tsim cov phiaj xwm raws li cov txheej txheem tau muab nrog cov kauj ruam no (koj yuav tsum rub tawm nws), ua kom ntseeg tau tias nws tau thaiv nrog cov hlau hauv av yog tias ze rau ib lub suab nrov tsim tawm. Cheebtsam. Txuas lub zog thiab hauv av rau hauv Circuit Court los ntawm lub tshuab hluav taws xob, tab sis tsis txhob nqes lub teeb liab. Txheeb xyuas tias lub teeb liab nyob ib puag ncig 4 volts thiab hloov me ntsis thaum koj tig lub "DC offset kho" potentiometer. Kho lub potentiometer rau 4 volts thiab muab lub suab tso rau hauv lub xov tooj mus rau qhov seem ntawm lub Circuit Court.

Txawm hais tias cov txheej txheem qhia pom siv lub mloog pob ntseg nkaus li cov tswv yim, koj tseem tuaj yeem ntxiv lub bluetooth adapter nrog nws cov zis tso rau qhov twg lub suab tso suab yog. Lub bluetooth adapter tuaj yeem siv los ntawm 7805 tus tswj hwm. (Kuv muaj 7806 thiab siv lub diode kom poob lwm 0.7 volts).

Fais fab lub zog txuas ntxiv, thiab ntsaws rau hauv kab txuas rau AUX nkaus ntawm lub rooj tsav khoom. Tej zaum yuav muaj qee qhov tsaus muag zoo li qub.

Yog tias lub suab nrov nrov dhau lawm muaj ob peb yam koj tuaj yeem sim:

• Koj puas tau thaiv cov theem nkag tau zoo? Cov sib piv tsim cov suab nrov ib yam nkaus.
• Ntxiv 100 nf capacitor hla qhov tso tawm ntawm tus hloov pauv.
• Ntxiv 100 nf capacitor nruab nrab ntawm lub suab tawm thiab hauv av thiab tso 2k resistor hauv kab ua ntej lub capacitor.
• Xyuas kom tseeb tias lub xov tooj cua tsis nyob ze ntawm lub zog xa hluav taws xob lossis cov xov tooj cua tso tawm.

Maj mam (dhau ob peb feeb) tig lub ntim, kom ntseeg tau tias tsis muaj dab tsi kub dhau lossis cuam tshuam. Kho qhov nce kom lub suab nrov tsis kaw tshwj tsis yog lub ntim tau siab tshaj plaws.

Nyob ntawm qhov ua tau zoo ntawm cov tub ntxhais inductor thiab qhov loj ntawm lub rhaub dej kub, nws yuav yog lub tswv yim zoo kom ntxiv lub kiv cua me me, siv los ntawm 12v tsheb nqaj hlau, kom txias lub suab nrov. Qhov no yog lub tswv yim tshwj xeeb tshaj yog tias koj yuav muab nws tso rau hauv ib lub thawv.