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entwodiksyon
BH1417 FM san fil transmetè chip, li ka travay nan 87MHz ~ bann frekans 108MHz, yo itilize nan konjonksyon avèk yon kous periferik senp ka transmèt siyal FM odyo, li kapab yon kat son òdinatè, jwèt videyo, CD, DVD, MP3, mixer, stereo stereo transmisyon odyo transmetè batman siyal, yo ka san fil FM transmisyon stereo kapab reyalize ak òdinè stereo FM reseptè. Apwopriye pou pwodiksyon an nan stereo pale san fil, kas ekoutè san fil, CD, MP3, DVD, PAD, kaye konpitè yo ak lòt san fil adaptè odyo.
BH1417 karakteristik prensip
FM kous transmetè sèvi ak PLL sistèm pou frekans ki estab. An pati pa osilator la segondè-frekans, gwo anplifikatè frekans ak yon sentetizeur frekans bouk ofi-fèmen. FM ki konpoze de segondè-frekans pa yon osilator varactor dyod, osilator la segondè-frekans se yon faz fèmen bouk VCO FM Stéréo siyal konpoze dirèkteman atravè li. Osilator segondè frekans pa yon 9-PIN kous LC ekstèn ak sikwi entèn yo, siyal la ochilasyon apre pwodiksyon an segondè-frekans anplifikatè soti nan 11-peny, an menm tan an pas kous la ofi-fèmen bouk konpare yon pwodiksyon siyal sou 7 PIN korije valè de osilator wo frekans lan, asire ke estabilite nan frekans. Yon men depase PLL mete nan frekans, 7 an PIN pral nivo a nan pwodiksyon an segondè; si mwens pase yon frekans ansanm, li pral nivo desann pwodiksyon; menm tan an, nivo li yo pral menm bagay la tou .
1) nan plenn lan pre-anfaz, kous la limiteur, entegrasyon an nan ba-pas filtre kous la (LPF), se konsa ke gen bon jan kalite a nan siyal odyo nan disrè sikui (tankou BA1404, NJM2035, elatriye) anpil amelyore.
2) bouk nan faz-fèmen frekans-fèmen, ak entegrasyon ak kous la transmetè FM, fè frekans lan transmetè se yon bagay ki estab.
3) lè l sèvi avèk 4 DIP switch anviwònman frekans, yo ka mete nan 14 pwen, fasil yo sèvi ak.
BH1417 estrikti a entèn yo montre nan Figi 1. Li konsiste de 5 pati: odyo kous pre-pwosesis (anfaz, limiteur ak filtè pas ki ba); en sikwi dèlko (kristal, divize); PLL sikwi (deteksyon faz, frekans-fèmen); frekans anviwònman sikwi (wo ak ba level conversion) FM transmitter circuit. Peripheral Circuit DIP switch Consisting of the frequency control circuit a voltage controlled oscillator Composed of a carrier generation circuitry, timer, and Reviews some of the coupling capacitor.
Aplikasyon Awondisman
Audio input terminal of the circuit design limit
BH1417 audio input limit of the maximum level, the excessively wide input level Will damage the chip. In the pre-trial course, the unpredictability of the input audio level amplitude, in order to protect the chip, you need to input audio signal limit. The limit system is very simple, the use of variable potentiometer can. The system shown in Figure 2, the capacitive function of the audio signal is coupled to the chip, while the DC blocking function.
Vòltaj yo kontwole osilator paramèt konsepsyon
Jounal konbine nan BH1417 frekans pwen montre ke varyasyon nan frekans ranje of nan vòltaj kontwole osilator dwe kouvri tout pwen frekans of nan chip. Pran an kont eleman yo jeneral of presizyon ak nivo nan teknoloji pwosesis, isit la apwopriye yo detann nan bann, yo nan lòd asire ki nan chip nòmalman fèmen frekans. Sipoze ke bann: 80MHz ~ 120MHz. Vòltaj kontwole osilator a kous yo montre nan Figi 3. L reglabl enduktans of nan komen nwayo, nan enduktans ak nan valè nominal (30 NH ~ 60nH); capacité la of nan varactor dyod is chanje ak chanjman nan of nan patipri vòltaj, ak limit li yo (7pF yo 35pF). Yo nan lòd asire estabilite nan kous la, C2 ak C3 valè pa kapab ke anpil diferans isit la asime ke nan C2 pran 51 PF C3 ranje yo pran 7 pF yo 35pF. Next, nan detèmine valè a nan C1. Pa fòmil (1) fòmil (2) Montre nan enduktansdèstokaj L, CAPACITOR C3 yo yo pran minimòm la, nan maksimòm frekans ochilasyon nan vòltaj kontwole osilator la yo jwenn, Sou kontrè a, Jwenn nan frekans minimòm.
Vin fè yon sèl (1) (2), nou gen:
Kote, C2, C3 konekte nan seri ranje capacité: 6.16 PF 20.76pF, nan L, C3 limit ranplase nan nan fòmil (3), Effective finishing
Inite of nan fòmil C1 PF. Kalkile: 45.27 Atravè pi wo a nan kalkil montre ke, pa sèlman isit la jis demontre kalkil ide ak metòd pou eleman yo divès kalite nan la valè. I espere To Provide a theoretical referans pou nan konsepsyon de kous la.
FM transmetè konsepsyon kous
Stereo siyal D ' nan nan 1,22 PIN, ak 2,3,20,21 several pine ekstèn resistive ak kapasitif konbinezon, The completion of nan filtraj ki ba-pas of nan siyal stereo pre-anfaz, ak siyal la konpoze apre nan batman, batman nan by 5 pye pwodiksyon. 15, 16, 17, 18-Pin D ' frekans Kòd apre Decoder ak faz siyal kontwòl VCO yo of nan PLL osilator pwodiksyon by 7 pye. sa a Kontwòl VCO an ekstèn segondè-frekans kous ochilasyon is ki konpoze of eleman disrè yo pwodwi yon siyal konpayi asirans of nan FM Stéréo, ak nan a Darlington tranzistò 2SD2142 5 pye konpoze pwodiksyon siyal stereo batman of nan FM frekans. Siyal la modulation D ' nan 9 pye BH1417, nan entèn RF anplifikatè anplifye RF siyal pwodiksyon by 11 pye. Jounal pwodiksyon siyal kapab be dirèkteman konekte yo nan transmèt antèn transmetè D ' yo nan RF anplifikatè pouvwa anplifye emisyon yo elaji distans transmèt. 13-14 pye bezwen yon ekstèn a 7.6MHz kristal osilateur, yo bay yon ki estab revèy yo nan pati of nan nan BH1417 entèn faz stereo batman siyal.
BH1417 Wireless transmetè chip An rezime, nan tipik kous aplikasyon, as yo montre in figi 4. Jounal itilizatè kapab JP1 switch fèmen epi dekonekte pa chanje a rele Kòd yo mete nan transmèt frekans (Espesyalman, as yo montre in Table 1), in lòd yo evite entèferans soti nan fò estasyon radyo nan lespas nan rejyon ka egziste.
Épilogue
BH1417 in anpil pwodwi kapab aplike, men li yo periferik kous konsepsyon ak kontwòl prensip is fondamantalman menm bagay la tou, nan atik dekri nan konsepsyon ka garanti nan a BH1417 nòmal travay nan aplikasyon an pratik nan nan vòltaj yo kontwole osilator ak RF yon pati nan desen an kapab be aprann nan men oswa dirèkteman aplikasyon.
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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