FM nhepfenyuro

Maitiro ekugadzira stereo FM transmitter?

BA1404 yakaderera-voltage, yakaderera-simba dhizaini ine yakanyanya kushandisa simba re500mW.
Inobatanidza stereo modulation, FM modulation, uye radio frequency amplification pane imwe chip; inoda zvishoma zvikamu zveperipheral;
Iyo kupatsanurwa kwematanho maviri kwakakwira, ine kukosha kwakajairika kwe45dB;
Iyo yekupinza impedance ndeye 540Ω (fin=1kHz), uye iyo yekupinda kuwana ndeye 37dB (Vin=0.5mV);
RF inobuda inogona kusvika 600mV.
Dunhu rinoshandisa dhiyabhorosi yakasarudzika, uye tuning amplification inowedzerwa kune inobuda kumashure kuti isangane nezvinodiwa zvemagetsi. Chengetedzo inofanirwa kutorwa pano mudunhu rekutapurirana kuti usave nesimba rakawandisa. Hazvisi pamutemo kana yakakura uye inokanganisa mamwe ma frequency. Simba repamusoro rinongori pamutemo mune mamwe ma frequency band. Ini ndakanga ndisinganzwisise mutemo pano, uye simba panguva iyoyo raive rakakwirira.
Iyo stereo pre-stage ndeye odhiyo amplifier yematanho maviri. Kana iyo yekupinza iri 0.5mV, kuwana kwakakwira se37dB uye frequency bandwidth i19kHz.

Ini ndaitya kuti simba rekubuda re1404 rakanga risina kukwana, saka ndakawedzera kumwe kukwidziridzwa gare gare.

Inductor yakarurama mumufananidzo uri pamusoro inogadziriswa. Nekuishandura, inoshandura iyo resonance frequency, inova frequency yekubuda kunopera. Inogona kuverengwa zvichibva pane formula. Asi iyo inductance haina kuverengerwa panguva iyoyo. Saka ingoisa mukati uye shandisa redhiyo kugamuchira. Rongedza frequency yekugamuchira redhiyo paunenge uchigadzirisa. Chero bedzi inzwi randinobudisa riri rechokwadi. Iyo pop-up effect yakanaka kwazvo. Uye zvakare, zvakakosha kuti utarise kune iyo parameter ye capacitor pano, uye iyo parameter mune inotevera amplification uye tuning zviratidzo zvinoda kugadziriswa nhanho nhanho. Zvinofanira kunge zvakatora nguva. Kazhinji kutaura, inzwi rinogamuchirwa rinonyatsojeka.

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