AVT732 B. Ntxhi - Ntxub Hunter
Kev ua haujlwm ntawm qhov system ua rau muaj kev zoo siab rau tus neeg siv. Lub suab ntxhi uas ntsiag to thiab ib txwm tsis hnov tsw suab nrov yog nthuav dav rau kev mloog tsis nco qab.
Lub voj voog yog zoo meej rau ntau yam kev sim uas cuam tshuam nrog kev nthuav dav ntawm cov suab sib txawv. Qhov no tuaj yeem muaj txiaj ntsig zoo rau cov neeg tsis hnov lus me me, thiab tseem yog qhov zoo tshaj plaws rau kev saib xyuas kev pw tsaug zog ntawm cov menyuam yaus. Nws kuj yuav raug qhuas los ntawm cov neeg nyiam kev sib txuas lus nrog xwm.
Kev piav qhia ntawm qhov layout
Lub teeb liab los ntawm M1 electret microphone yog pub rau thawj theem - lub amplifier tsis-inverting nrog IS1A. Qhov nce yog qhov tsis tu ncua thiab yog 23x (27 dB) - txiav txim siab los ntawm cov resistors R5, R6. Lub teeb liab ua ntej amplified yog pub rau ib qho inverting amplifier nrog IC1B lub voos xwmfab - ntawm no qhov nce, los yog qhov attenuation, yog txiav txim los ntawm qhov piv ntawm cov active resistances ntawm lub potentiometers R11 thiab R9 thiab yuav txawv nyob rau hauv 0 ... 1. Lub kaw lus yog siv los ntawm ib qho hluav taws xob, thiab cov ntsiab lus R7, R8, C5 tsim hluav taws xob hauv av. Lim circuits C9, R2, C6 thiab R1, C4 yog xav tau nyob rau hauv ib tug heev nce system thiab lawv txoj hauj lwm yog los tiv thaiv tus kheej-excitation los ntawm lub teeb liab nkag mus rau hauv lub hwj chim circuits.
Thaum kawg ntawm txoj kev khiav, qhov nrov TDA2 IC7050 lub zog amplifier tau siv. Nyob rau hauv ib tug raug daim ntawv thov system, nws ua hauj lwm raws li ib tug ob-channel amplifier nrog ib tug nce ntawm 20 × (26 dB).
Daim duab 1. Schematic daim duab
Kev txhim kho thiab kho
Daim duab kos duab Circuit Court thiab cov tsos ntawm PCB yog pom nyob rau hauv daim duab 1 thiab 2. Cov khoom yuav tsum tau soldered rau PCB, nyiam dua nyob rau hauv qhov kev txiav txim qhia nyob rau hauv daim ntawv teev cov khoom. Thaum sib sau ua ke, koj yuav tsum tau them nyiaj tshwj xeeb rau cov txheej txheem ntawm kev sib txuas cov ntsiab lus: electrolytic capacitors, transistor, diodes. Qhov kev txiav tawm nyob rau hauv cov ntaub ntawv ntawm cov khoom muag thiab cov kev sib xyaw ua ke yuav tsum sib haum nrog cov duab kos rau ntawm lub rooj tsav xwm luam tawm.
Ib lub tshuab hluav taws xob tuaj yeem txuas nrog cov xov hlau luv luv (txawm tias muaj qhov txiav tawm qhov hluav taws xob), lossis nrog cov xaim ntev dua. Nyob rau hauv txhua rooj plaub, xyuam xim rau lub polarity cim nyob rau hauv daim duab thiab lub rooj tsavxwm - nyob rau hauv lub microphone, qhov kawg tsis zoo yog txuas nrog cov ntaub ntawv hlau.
Tom qab sib sau ua ke, nws yog ib qho tsim nyog yuav tsum tau xyuas kom zoo zoo seb cov khoom puas tau soldered nyob rau hauv tsis ncaj ncees lawm kev taw qhia los yog nyob rau hauv tsis ncaj ncees lawm qhov chaw, seb lub soldering point yog kaw thaum lub sij hawm soldering.
Tom qab kuaj xyuas qhov sib dhos kom raug, koj tuaj yeem txuas lub mloog pob ntseg thiab lub zog hluav taws xob. Flawlessly sib sau ua ke los ntawm cov khoom ua haujlwm, lub amplifier yuav ua haujlwm sai sai. Ua ntej tig lub potentiometer mus rau qhov tsawg kawg nkaus, i.e. mus rau sab laug, thiab mam li maj mam nce lub ntim. Kev nce ntau dhau yuav ua rau nws tus kheej-awakening (ntawm txoj kev headphones - microphone) thiab ib qho tsis kaj siab heev, nrov nrov.
Lub kaw lus yuav tsum tau siv los ntawm plaub AA lossis AAA ntiv tes. Nws tuaj yeem siv tau los ntawm 4,5V rau 6V plug-in fais fab mov.
