Electret Microphone Preamplifier: 7 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:28

Nyob Zoo Sawv Daws! Kuv rov nrog lwm tus nrog lwm tus qhia. Qhov no yog hais txog yuav ua li cas thiaj ua tau Electret Microphone pre-amplifier. Nrog rau qhov no, peb tuaj yeem hloov pauv lub zog hluav taws xob rau lub zog hluav taws xob thiab ua kom nrov me ntsis nrog kev pab ntawm preamplifer. Nws ua haujlwm zoo kawg thiab tuaj yeem tsim tau yooj yim nrog qee cov khoom siv hluav taws xob. yog li, cia peb pib.

Kauj Ruam 1: Sib Sau Cov Khoom

Cov cuab yeej xav tau

Solder Hlau

Cov hlau xaim

Rab phom rab phom (yeem tab sis siv tau)

Hlau stripper

Qhov yuav tsum tau ua ua ntej preamplifier nrog electret mic yog:

NPN Transistor- (Kuv siv BC547, ib qho zoo sib xws yuav ua haujlwm)

Capacitor - 4.7uF X2

Electret microphone

Perfboard

SPST Hloov (Kuv tsis pom nws, yog li kuv siv SPDT ib qho)

Hlau

LED (Kuv siv liab)

Roj teeb 9v

9v Roj Teeb Txuas

Cov Khoom Siv Hluav Taws Xob (Kuv siv lub thawv ntawv thawv thiab kho kom zoo nkauj)

Suab Jack - 3.5mm (rau cov suab paj nruag, thiab lwm yam)

- 1/4 nti (rau cov suab nrov)

Resistor - 1K (rau LED)

- 2K2 ib

-47k

-220K Nws

Kauj Ruam 2: Tau Txais Lub Tswv Yim - Txoj Kev Xav

Lub tshuab electret microphone yog hom electrostatic capacitor-based microphone, uas tshem tawm qhov xav tau rau lub zog siv hluav taws xob los ntawm kev siv cov khoom siv tas mus li.

Lub tshuab hluav taws xob yog cov khoom siv dielectric ruaj khov nrog cov khoom siv hluav taws xob zoo li qub (uas, vim muaj kev tiv thaiv siab thiab tshuaj lom neeg ruaj khov ntawm cov khoom, yuav tsis lwj rau ntau pua xyoo). Lub npe los ntawm electrostatic thiab hlau nplaum; teeb duab sib piv rau kev tsim cov hlau nplaum los ntawm kev sib koom ua ke ntawm cov hlau nplaum hauv ib daim hlau. Electrets feem ntau yog ua los ntawm thawj cov khoom siv dielectric uas tsim nyog xws li yas lossis siv quav ciab uas muaj cov ncov qaumteb qabteb, thiab tom qab ntawd tso cai rau nws rov ua kom muaj zog nyob hauv thaj chaw electrostatic muaj zog. Lub ncov qaumteb qabteb molecules ntawm dielectric ua rau lawv tus kheej mus rau qhov kev taw qhia ntawm electrostatic teb, tsim cov khoom siv hluav taws xob tas mus li "kev tsis ncaj ncees". Cov xov tooj cua electret niaj hnub siv PTFE yas, xws li hauv zaj duab xis lossis cov ntawv daws teeb meem, los tsim cov electret.

Lub transistor yog cov cuab yeej siv hluav taws xob siv los txhawb lossis hloov pauv cov cim hluav taws xob thiab lub zog hluav taws xob. Nws yog tsim los ntawm cov khoom siv hluav taws xob nrog tsawg kawg peb lub dav hlau rau kev txuas mus rau sab nrauv. Qhov hluav taws xob lossis qhov tam sim no siv rau ib khub ntawm transistor lub davhlau ya nyob twg hloov pauv tam sim no mus rau lwm khub ntawm cov davhlau ya nyob twg. Vim tias kev tswj hwm (tso zis) lub zog tuaj yeem siab dua li kev tswj hwm (tawm tswv yim) lub zog, lub transistor tuaj yeem ua lub teeb liab. Niaj hnub no, qee cov transistors tau ntim ib tus zuj zus, tab sis ntau yam ntxiv tau pom nyob hauv cov khoom sib txuas.

Transistor raws li lub suab nrov nrov

Hom-emitter amplifier tau tsim los kom hloov pauv me me hauv qhov hluav taws xob (Vin) hloov pauv me me tam sim no los ntawm lub hauv paus ntawm transistor; transistor qhov kev hloov pauv tam sim no ua ke nrog cov khoom siv hauv Circuit Court txhais tau tias cov viav vias me me hauv Vin tsim kev hloov pauv loj hauv Vout. Various kev teeb tsa ntawm ib qho transistor amplifier yog ua tau, nrog qee qhov muab tam sim no nce, qee qhov nce zog, thiab qee qhov ob. Los ntawm cov xov tooj ntawm tes mus rau TV, cov khoom lag luam muaj ntau yam suav nrog lub suab nrov rau kev tsim dua tshiab, xa xov tooj cua, thiab teeb liab. Thawj qhov kev txiav txim siab-transistor audio amplifiers NW nyuam qhuav muab ob peb puas milliwatts, tab sis lub zog thiab lub suab ncaj ncees maj mam nce ntxiv raws li cov transistors zoo dua tau muaj thiab cov khoom siv suab paj nruag hloov zuj zus. Niaj hnub nimno transistor suab amplifiers txog li ob peb puas watts yog ib qho thiab tus nqi pheej yig.

Cov neeg ua tim khawv

en.wikipedia.org/wiki/Electret_microphone

en.wikipedia.org/wiki/Transistor

Kauj ruam 3: Schecmatic

Ua raws li schematic thiab tsim lub Circuit Court. Kuv pom zoo kom koj ua thawj qhov qauv ntawm lub Circuit Court ntawm lub khob cij.

Kauj Ruam 4: Tsim Circuit Court

Tam sim no koj tuaj yeem tsim lub Circuit Court ntawm perfboard. Ceev faj me ntsis vim qhov no muaj cov lej ntawm pawg thawj coj saib zoo li lub mic, hloov, txuas lub roj teeb, LED, thiab lwm yam. dai ib ncig ntawd. Siv heatshrink tubing lossis insulating tag nrho cov xov hlau. Kuv kuj siv nws los ua pawg rau lawv kom yooj yim.

Kauj Ruam 5: Xeem Preamplifier

Tom qab tsim lub tshuab txuas hluav taws xob hauv lub roj teeb, qhib lub pob hluav taws xob, txuas lub suab kab rau ib txheej ntawm cov neeg hais lus, lub tshuab ntaus nkauj lossis lub tshuab ua kom nrov nrov thiab tom qab ntawd thaum kawg tham qee yam ntawm lub mic. Koj yuav tsum muaj peev xwm hnov koj lub suab meej meej los ntawm tus hais lus. Yog tias txawm li cas los xij koj lub suab tsis meej, yaj thiab rov ua dua tag nrho cov pob qij txha qhuav thiab tshwj xeeb tshaj yog xyuas cov resistors thiab cov khoom siv. Yog tias nws tsis ua haujlwm ces tshawb xyuas txhua qhov kev sib txuas thiab xov hlau thiab kho lawv.

Kauj Ruam 6: Sib dhos thiab kaw qhov Circuit

Koj tuaj yeem kaw lub Circuit Court hauv cov khoom siv hluav taws xob. Kuv muab nws tso rau hauv ib lub thawv ntawv. Ceev faj tsis txhob xaim ib qho hlau. Muab lub suab tso tawm, hloov pauv, mic thiab LED kom lawv tuaj yeem pom / nkag los ntawm sab nraum lub thawv.

Kauj Ruam 7: Kho Kom Zoo Nkauj Koj Preamplifer (xaiv tau)

Tam sim no koj tau ua tiav qhov kev npaj ua ntej, koj tuaj yeem kho nws kom zoo nkauj dua.

Kuv tau npog nws siv qee yam ntawv xuas tes ua thiab muab daim kab xev insulating xiav rau ntawm ntug raws ciam teb. Kuv ntxiv qee daim ntawv lo rau ntawm ob sab.

Koj tuaj yeem txaus siab siv lub microphone thiab tuaj yeem sau koj cov lus hais lossis nkauj thaum ntsaws nws rau hauv lub khoos phis tawj, lub tshuab hluav taws xob, thiab lwm yam. Thov tawm tswv yim hauv qab no yog tias koj muaj lus nug lossis tswv yim.

Muaj ib hnub zoo! Ua tsaug!