Phantom Fais Fab Rau Lub Microphone: Yuav Ua Li Cas Txuas Thiab Ua Nws Tus Kheej?

2024 Tus sau: Beatrice Philips | [email protected]. Kawg hloov kho: 2023-12-16 05:41

Qee lub microphones feem ntau siv hauv chav kawm ua haujlwm tsis siv neeg. Tab sis rau qhov no lawv xav tau phantom zog.

Nws yog dab tsi?

Phantom zog tau siv los ua haujlwm condenser thiab electret microphones . Hauv qhov no, lub zog tau muab los ntawm cov kab hluav taws xob tib yam li lub suab. Qhov hluav taws xob no feem ntau yog 48 V. Txawm li cas los xij, koj yuav tsum tsis txhob yuam kev lawv nrog lub khoos phis tawj zoo ib yam - lawv lub zog siv yog 5 V. Lub zog no tseem hu ua phantom, tab sis nws tsis muaj dab tsi ua nrog cov cuab yeej tshaj lij.

Lub cuab yeej pub lub microphone, thiab nws txoj haujlwm zoo ib yam li kev ua haujlwm ntawm lub capacitor, nrog qhov sib txawv nkaus xwb, uas tsis yog lub phaj capacitor, lub microphone membrane ua haujlwm.

Nws nyob qhov twg?

Cov peev txheej zoo li no feem ntau tau teeb tsa rau hauv tau txais cov khoom siv . Lawv tuaj yeem sib xyaw cov consoles, lub mloog pob ntseg microphone thiab lwm yam khoom siv zoo sib xws. Txawm li cas los xij, qee qhov xwm txheej, lub zog phantom yuav tsis muab los ntawm cov chaw tsim khoom, lossis lub zog xav tau qis dua, piv txwv li, 24 lossis 12 V. Tom qab ntawd koj yuav tsum yuav phantom fais fab cais, thiab nws siv yuav tsum yog hla dhau. Ua lwm yam lus, nws yuav tsum tau txuas nrog lub microphone, thiab tso tawm los ntawm chav tsev mus rau lub cuab yeej txais.

Yog tias lub hwj chim tau yuav cais , tom qab ntawd koj yuav tsum paub tias nws yuav tsum tau teeb tsa hauv txhua qhov chaw yooj yim thiab siv tau, txij li lub cuab yeej muaj lub pob uas lub zog phantom tuaj yeem qhib lossis tua tau.

Kev yuav khoom ntawm phantom zog kuj tseem tsim nyog hauv qhov xwm txheej ntawd yog tias ib tus neeg tsis txaus siab rau qhov ua tau zoo ntawm cov khoom uas twb tau tsim rau hauv cov cuab yeej siv . Nws muaj peev xwm hais tias cov khoom siv hluav taws xob muaj peev xwm ua rau muaj suab nrov lossis tsis hnov suab nrov. Feem ntau cov teeb meem zoo li no tshwm sim hauv cov khoom pheej yig.

Chav tsev nws tus kheej feem ntau yog siv los ntawm cov roj teeb lossis cov khoom ntim khoom, thiab nws yuav tsum muaj lub lim dej qis-dhau, uas yog lub luag haujlwm rau qhov tsis muaj suab nrov qis. Cov condenser microphones yooj yim kuj siv lub zog rau polarization.

Nws kuj tseem tsim nyog sau cia tias cov microphones no tuaj yeem txuas nrog rau XLR chaw nres nkoj.

Yuav ua li cas koj tus kheej?

Txhawm rau kom tau txais 48 V cov khoom siv hluav taws xob, siv cais transformer lossis DC / DC converter . Thaum siv roj teeb, nws yog qhov muaj txiaj ntsig kom paub tias feem ntau lub microphones ua haujlwm tsawg dua 48 V. Rau qhov pom tseeb, koj tuaj yeem sim 9 V, maj mam nce nws mus rau qib uas xav tau. Txawm li cas los xij, nws tsim nyog nco ntsoov tias lub suab microphone yuav txawv ntawm qhov nws yuav tsum yog los ntawm lub neej ntawd . Hauv qhov no, 5 lub roj teeb txaus - qhov no yuav txaus los muab lub zog rau lub microphone.

Thaum siv roj teeb nws yog qhov tsim nyog kom luv-Circuit lawv nrog lub capacitor kom tsis muaj suab nrov nrov. Koj tuaj yeem nruab 0, 1uF thiab 10uF capacitors ua ke nrog cov roj teeb.

Hauv qab no yog qhov piv txwv ntawm yuav ua li cas thiaj ua tau lub zog phantom nrog koj txhais tes, kom meej dua, cov txheej txheem raws li nws yuav ua haujlwm.

Txhawm rau siv cov phiaj xwm xav tau, koj yuav xav tau kev ruaj ntseg thiab lim ntawm kev cuam tshuam , nrog tus tswj hwm txoj kab twg LM317 ua haujlwm zoo heev. Txawm li cas los xij, qhov no yuav xav tau qhov hloov pauv hluav taws xob ntawm 32 V. Kev siv lub tshuab hloov pauv siab dua 24 V yog qhov ncaj ncees, tab sis lub hauv paus no yuav tsis nyob ntawm tes. Hauv qhov no, tus lej sib npaug 4, ua rau lub capacitors thiab diodes, yuav tuaj yeem cawm. Nws tseem tsim nyog sau cia tias qhov kev xaiv ntawm qhov kev taw qhia yog qhov ncaj ncees los ntawm qhov muaj ib qho taw tes rau nkag thiab tawm, uas yog rho tawm . Ua tsaug rau qhov no, kev sib txuas lus tau yooj yim heev, ntxiv rau, muaj kev txuag nyiaj hauv kev yuav khoom ntawm lub tshuab hluav taws xob.

Yog koj saib ze ntawm daim duab hauv qab no, koj tuaj yeem pom qhov ntawd ib qho xoom (stabilizer LM317) lossis tus lej sib npaug los ntawm 4 suav nrog raws li cov txheej txheem txheej txheem . VD2 - Zener diode - tiv thaiv microcircuit los ntawm qhov poob qis ntawm cov tswv yim thiab cov zis. Qhov kev poob qis no tuaj yeem ua tau thaum lub sijhawm them tus nqi hluav taws xob C7 lossis kev teeb tsa tsis raug ntawm R5 thiab yog lub sijhawm luv. Hauv qhov no, microcircuit tau raug tshem tawm, yog li tiv thaiv nws qhov ua tsis tiav.

Qhov rov qab hluav taws xob yuav tsum tau xaiv tsis pub ntau dua 35 V, tab sis qis heev kuj tseem tsis xav tau . Qhov no yog qhov tsim nyog txhawm rau tswj kev hloov pauv thiab kev ruaj ntseg ntau (tshwj xeeb tshaj yog qhov tseem ceeb thaum cov hloov pauv yuav xa hluav taws xob ntau dua 12 V). Hauv peb cov ntawv, qhov yuav tsum tau ntsuas ntawm qhov hluav taws xob tso tawm ntawm qhov ruaj khov (48 V) tuaj yeem teeb tsa siv R5.

C1-C4 ua ke nrog VD1-VD4 ua tus lej sib npaug 4. Txhawm rau txo qhov keeb kwm yav dhau, ob zaug pom tau siv ntxiv : qhov kev txiav txim thib ob lim (R1C5) thiab lim lim rau LM317. Tom qab lub microcircuit, lub tshuab hluav taws xob C7 tau muab - qhov no yog qhov tsim nyog los tiv thaiv kev txaus siab ntawm tus kheej ntawm Circuit Court.

Resistor R5 yuav tsum tau teeb tsa los txiav qhov hluav taws xob tso tawm. Cov neeg tiv thaiv R4 thiab R5 yuav tsum muaj zog heev vim tias lawv yuav sov thaum ua haujlwm. Kev ntsuas rau R4 yog 0.25 W, rau R5 - 0.5 W.

Hauv qab no yog hloov pauv Circuit . Lub hwj chim tau siv ntawm no ua cov khoom siv cais. Hauv qhov no, phantom lub zog tau muab los ntawm kev txwv cov neeg tawm tsam R6 thiab R7 rau lub teeb liab txuas ntawm lub cuab yeej (rau condenser microphones nrog XLR txuas, cov no yog tus pin 2 thiab 3, 1 yog ib txwm muaj). Lub teeb liab tau pub los ntawm kev thaiv cov kab hluav taws xob C8 thiab C9 ncaj qha rau lub cuab yeej txais.

Txhawm rau keeb kwm yav dhau los ntawm kev noj zaub mov kom tsis tuaj lossis ua kom tsawg, koj yuav tsum kho lub Circuit Court nrog lub tshuab txiav trimmer R5 … Hauv qhov no, nws yog qhov tsim nyog los xyuas kom meej tias keeb kwm yav dhau yog tsawg thiab lub zog yog qhov siab tshaj plaws.

Tawm ruaj khov tuaj yeem ua haujlwm raws li lub lim dej tsuas yog tias qhov hluav taws xob poob qis nws, uas yuav sib npaug rau qhov ripple amplitude.

Hauv qhov kev sib tw no, tus faib cov neeg tawm tsam tsis muaj qhov ntsuas tseeb, vim qhov no tso cai rau lawv hloov mus rau cov hloov pauv sib txawv (10 txog 16V).