DIY Micromitter Stereo FM Transmitter

Pamapeto pake - mawu okhudzana ndi stereo FM omwe ndiwosokonekera kugwirizanitsa.

Studio yatsopano ya Micrositter ya FM iyi imatha kufalitsa zikwangwani zabwino kwambiri pamamita pafupifupi 20. Ndibwino kufalitsa nyimbo kuchokera pa CD player kapena kuchokera kwina kuti zitha kujambulidwa kumalo ena.

Mwachitsanzo, ngati mulibe wosewera pa CD mugalimoto yanu, mutha kugwiritsa ntchito Micromitter kuti mufalitse ma CD kuchokera pa CD yosewerera mpaka wayilesi yagalimoto yanu. Mwinanso, mungafune kugwiritsa ntchito Micromitter kufalitsa ma CD kuchokera kuchipinda chochezera m'chipinda chochezera mpaka wolandila FM komwe lili gawo lina la nyumbayo kapena dziwe.

Chifukwa idakhazikitsidwa pa IC imodzi, chipangizochi ndi chovuta kuzimangirira ndikumakwanira mosavuta m'bokosi laling'ono la pulasitiki. Imafalikira pa bandi ya FM (mwachitsanzo, 88-108MHz) kotero kuti chiphaso chake chitha kulandiridwa pa tuner yokhazikika ya FM kapena wailesi yonyamula.

Komabe, mosiyana ndi ma transmitters amtundu wa FM omwe adasindikizidwa mu SILICON CHIP, mapangidwe atsopanowa sakusintha mosinthasintha pa bedi la FM. M'malo mwake, switch ya njira 4 ya DIP imagwiritsidwa ntchito posankha imodzi mwamagawo 14 okonzekeretsedwa. Izi zikupezeka m'mizere iwiri kuchokera pa 87.7-88.9MHz ndi 106.7-107.9MHz mu masitepe a 0.2MHz.

Palibe zomangira

Dinani kuti mupeze chithunzi chachikulu

Chithunzi.1: chithunzi chojambulira cha Rohm BH1417F stereo FM transmitter IC. Lembali likufotokoza momwe limagwirira ntchito.

Tidasindikiza koyamba kufalitsa uthenga wa FM mu SILICON CHIP mu Okutobala 1988 ndipo tidatsata izi mu Epulo 2001. Choperekedwa ndi Minimitter, matembenuzidwe oyambirirawo adatengera Rohm BA1404 IC yomwe sikupangidwanso.

M'magawo onse awiriwa, mayendedwe amafunikira kusintha kosinthika kwa ma ferrite osunthira mkati mwa ma waya awiri (coil oscillator ndi kola yolumikizira), kotero kuti kutulutsa kwa RF kumafanana ndi mafupipafupi amasankhidwa pa wolandila FM. Komabe, ena opanga adakumana ndi zovuta chifukwa kusinthaku kunali kovuta.

Makamaka, ngati muli ndi wolandira digito (mwachitsanzo, wopangidwira) wa FM, mumayenera kukhazikitsa wolandirayo pafupipafupi kenako ndikusintha pafupipafupi mawuwo. Kuphatikiza apo, panali mgwirizano pakati pa oscillator ndi kusintha kwa coil ndipo izi zidasokoneza anthu ena.

Vutoli kulibe pompangidwe latsopanoli, chifukwa palibe njira yolumikizirana pafupipafupi. M'malo mwake, zonse zomwe muyenera kuchita ndikukhazikitsa ma transmitter pogwiritsa ntchito njira ya DIP ya 4 ndi kuyimba nyimbozo pafupipafupi pa pulogalamu yanu ya FM.

Pambuyo pake, ndikofunikira kungosintha coil imodzi mukakhazikitsa ma transmitter, kuti mupeze opareshoni ya RF yolondola.

Zowongoleredwa mwachidule

Radio Stereo Micromitter yatsopano tsopano yakhala ikubowola makristudiyo zomwe zikutanthauza kuti chipangizocho sichikuchoka kawirikawiri pakapita nthawi. Kuphatikiza apo, kupotoza, kulekanitsa stereo, kuwerengera phokoso mpaka phokoso ndi kutsika kwa stereo kumakhala bwino pamtunduwu poyerekeza ndi zomwe zidapangidwa kale. Dongosolo lotsogolera lili ndi tsatanetsatane.

BH1417F transmitter IC

Dinani kuti mupeze chithunzi chachikulu

Mkuyu.2: gawo ili motsutsana ndi linanena bungwe likuwonetsa gulu lambiri (pini 5). Kutsimikiziridwa kwa 50ms kuzungulira 3kHz kumayambitsa kukwera poyankha, pomwe kutsika kwa 15kHz kutsika kumabweretsa kugwa poyankha pamwamba pa 10kHz.

Pakatikati pamapangidwe atsopanowa ndi CH1417F FM stereo IC yopangidwa ndi Rhom Corporation. Monga tanena kale, m'malo mwake muli zovuta kupeza BA1404 yomwe idagwiritsidwa ntchito kale m'mapangidwe.

Chithunzi.1 chikuwonetsa mawonekedwe a BH1417F. Mulinso makonzedwe onse ofunikira kufalitsa kwa stereo FM komanso gawo loyang'anira kristalo lomwe limapereka kutsekeka kwakanthawi.

Monga tawonetsera, BH1417F imaphatikizapo magawo awiri osiyana ophatikizira nyimbo, kumanzere kumanzere kumanja. Chizindikiro chanyimbo chakumanzere chimayikidwa kukhoma 22 ya chip, pomwe chizimba cha njira yakumanja chimayikidwa pini 1. Izi zomveketsa mawuzo zimayikidwa pazoyendera zomwe zimathandizira ma frequency amenewo kupitilira nthawi ya 50ms nthawi zonse (mwachitsanzo, mafunde omwe ali pamwambapa 3.183kHz) isanafike kufalikira.

Kwenikweni, kutsimikizira-kutsogolo kumagwiritsidwa ntchito kukonza chiwonetsero cha phokoso la chiphokoso cha FM. Imagwira ntchito pogwiritsa ntchito njira yothandizirana ndi kutsatsa kwa wolandila kuti mulimbikitse kutalikirana kwakukulu pambuyo pokwezeka, kuti mayankho pafupipafupi abwezeretsedwe. Nthawi yomweyo, izi zimachepetsa kwambiri malingaliro omwe akanakhala kuti amawonekera mu siginolo.

Kuchuluka kwa kutsimikizira kumakhazikitsidwa ndi mtengo wa ma capacitor omwe amalumikizidwa ndi zikhomo 2 & 21 (zindikirani: mtengo wa nthawi zonse = 22.7kΩ x kuchuluka kwa capacitance). M'malo mwathu, timagwiritsa ntchito 2.2nF capacitors kukhazikitsa kutsimikizika kwa 50μs komwe ndi muyeso wa Australia FM.

Kuchepetsa chizindikiro kumaperekedwanso mkati mwa gawo loyambirira. Izi zimaphatikizira kulumikizana ndi chizindikiro pamwamba penipeni, kuti tiletse kuchuluka kwambiri pazigawo zotsatirazi. Izi zimathandizanso kuti kusinthasintha kukhale kokwanira komanso kumachepetsa kupotoza.

Zizindikiro zomwe zimanenedweratu kumanzere kumanja ndi kumanja zimakonzedwa kudzera pazigawo ziwiri zotsika (LPF), zomwe zimapereka mayankho pamwamba pa 15kHz. Kugubuduza uku ndikofunika kuchepetsa kubwezeretsa kwa chisonyezo cha FM ndipo ndi malire ofanana ndi omwe amagwiritsidwa ntchito ndi omwe amafalitsa malonda pa FM.

Dinani kuti mupeze chithunzi chachikulu

Mkuyu.3: mawonekedwe azowonekera za chizindikiro cha stereo FM. Onani kuzungulira kwa toni ya woyendetsa pa 19kHz.

Zotsatira kuchokera kumanzere kumanja ndi kumanja kwa LPF zimagwiritsidwanso ntchito ngati chipika cha multiplex (MPX). Izi zimagwiritsidwa ntchito kupanga bwino kuchuluka (kumanzere kuphatikiza kumanja) ndi kusiyana (kumanzere - kumanzere) zizindikiro zomwe zimasinthidwa kukhala chonyamulira 38kHz. Wonyamulayo amakankhidwa (kapena kuchotsedwa) kuti apereke chizindikiro chonyamula mbali ziwiri. Amasakanizidwa mwachidule (+) chipika chokhala ndi liwu loyendetsa la 19kHz kuti lipereke njira yotulutsira (yomwe ili ndi makina onse a stereo) pa pini 5.

Gawo ndi mulingo wa 19kHz kamvekedwe kamayendedwe kamene amagwiritsidwa ntchito pogwiritsa ntchito capacitor pa pini 19.

Mkuyu ..3 chikuwonetsa mawonekedwe a mapangidwe a stereo. Chizindikiro (L + R) chimakhala pafupipafupi kuchokera pa 0-15kHz. Mosiyana ndi izi, msewu wonyamula wowirikiza mbali (LR) uli ndi mbali yotsika yomwe imachokera ku 23-38kHz ndi msewu wapamwamba kuchokera 38-53kHz. Monga taonera ,onyamula 38kHz kulibe.

Nyimbo ya 19kHz yoyendetsa ndege ilipo, komabe, izi zimagwiritsidwa ntchito pa wolandila FM kuti akonzenso kabokositi 38kHz kuti chizindikirocho chikhoza kulembedwa.

Chizindikiro chachikulu cha 38kHz ndi toni yoyendetsa ndege ya 19kHz chimachokera ndikugawa pansi 7.6MHz kristalo oscillator yemwe ali pamapini 13 & 14. Mafutukuwo amagawidwa koyamba ndi anayi kuti apeze 1.9MHz kenako amagawidwa ndi 50 kuti apeze 38kHz. Izi zimagawidwa ndi awiri kuti apeze toni ya woyendetsa 19kHz.

Kuphatikiza apo, chizindikiro cha 1.9MHz chimagawidwa ndi 19 kuti ipereke chizindikiro cha 100kHz. Chizindikirochi chimagwiritsidwa ntchito poyang'ana gawo lomwe limayang'aniranso zotsutsa pulogalamuyi. Kanema wapa pulogalamuyi ndi pulogalamu yoyerekeza pulogalamu yomwe imatsitsa mtengo wa chizindikiro cha RF.

Kugawika kwa gawo ili kumakhazikitsidwa ndi kuchuluka kwamagetsi pamagetsi D0-D3 (zikhomo 15-18). Mwachitsanzo, pamene D0-D3 yonse ili yotsika, pulogalamu yotsatsira imatha kugawanika ndi 877. Chifukwa chake, ngati osintha a RF akuthamanga pa 87.7MHz, gawo logawidwa kuchokera kutsamba likhala 100kHz ndipo izi zikufanana ndi pafupipafupi kugawanika kuchokera pa 7.6MHz Crystal oscillator (mwachitsanzo, 7.6MHz wogawidwa ndi 4 wogawidwa ndi 19).

Dinani kuti mupeze chithunzi chachikulu

Mkuyu.4: kuzungulira kwathunthu kwa Stereo FM Micromitter. DIP imasintha S1-S4 imayambitsa makulidwe osintha a RF ndipo izi zimayendetsedwa ndi kutulutsa kwa PLL pa pin 7 ya IC1. Izi zimayendetsa Q1 pomwepo imagwiritsa ntchito magetsi owongolera ku VC1 kuti asinthane ndi mphamvu yake. Kutulutsa kwamawu ophatikizira pini 5 kumapereka kusinthasintha kwa mawu.

Pochita, gawo lowunikira gawo pa 7 1 limapanga chisonyezo cholakwika kuyendetsa voliyumu yomwe imagwiritsidwa ntchito pa diode ya varicap. Varicap diode (VC4) imawonetsedwa pa chithunzi chachikulu chojambula (Fig.9) ndipo imapanga gawo la oseketsa a RF pa pini XNUMX. Kuyenda kwake mosiyanasiyana kumatsimikiziridwa ndi kufunikira kwa kutulutsa mbali ndi kutalika kofananira.

Popeza varicap diode ndipamene gawo lamalumikizidwe awa, titha kusintha ma RF oscillator pafupipafupi pakusintha kufunika kwake. Pogwira ntchito, mphamvu ya varicap diode imasiyanasiyana molingana ndi mphamvu yamagetsi ya DC yomwe amagwiritsa ntchito mwa kutulutsa kwa gawo la PLL.

Zochita, gawo loyesa limasinthira magetsi a varicap kotero kuti ma RF oscillator pafupipafupi ndi 100kHz pamakonzedwe otsutsa pulogalamu. Ngati ma RF pafupipafupi akukwera kwambiri, zotulutsa pafupipafupi kuchokera pagawo lomwe lingakonzedwe zikukwera ndipo gawo loyang'ana "liwone" cholakwika pakati pa izi ndi 100kHz yoperekedwa ndi gawo loyang'anira.

Zotsatira zake, gawo loyang'ana limachepetsa magetsi a DC omwe amagwiritsidwa ntchito pa varicap diode, potero amawonjezera mphamvu yake. Ndipo izi zimachepetsa ma frequency oscillator kuti abwezeretsenso mu "loko".

Komanso, ngati pafupipafupi RF imatsika, zotulutsa zomwe zingagulitsidwe zikhala zotsika kuposa 100kHz. Izi zikutanthauza kuti gawo loyang'aniramo tsopano likukweza voliyumu ya DC ku varicap kuti ichepetse mphamvu zake ndikukweza ma RF pafupipafupi. Zotsatira zake, makonzedwe awa a PLL akuwonetsetsa kuti zotsatsa zomwe zingagawidwe zimasinthidwa ku 100kHz motero zimapangitsa kuti RF oscillator ikhale yolimba.

Mwa kusintha kugawanika komwe titha kusintha titha kusintha ma RF pafupipafupi. Chifukwa chake, mwachitsanzo, ngati tikhazikitsa gawolo kupita ku 1079, osatila a RF ayenera kugwira ntchito pa 107.9MHz kuti zotsatsa zomwe zigawanidwe zikhalebe pa 100kHz.

Kusinthasintha kwamaulendo angapo

Zachidziwikire, kuti tifalitse mauthenga, tiyenera kusinthasintha ma RF oscillator. Timachita izi posinthira magetsi omwe amagwiritsidwa ntchito ku varicap diode pogwiritsa ntchito chizindikiro cha composite pini 5.

Dziwani, komabe, kuti pafupipafupi ma RF oscillator (mwachitsanzo, maulendo onyamula) amakhalabe okhazikika, monga momwe akhazikitsira wogawanitsira pulogalamu (kapena wotsutsa pulogalamu). Zotsatira zake, chizindikiro cha FM chomwe chimafalikira chimasinthasintha mbali iliyonse yamagalimoto onyamula malinga ndi gawo la siginecha ya composite - mwachitsanzo, imasinthidwa pafupipafupi.

Chosankha cha Bandpass

Tapangira bolodi ya PC kuti ivomere kulandila zosefera za bandpass pazosintha 11 RF za IC1. Zosefera izi zimapangidwa ndi Soshin Electronics Co ndipo amalembedwa kuti GFWB3. Ndi yaying'ono ya 3-terminal kusindikizidwa kwa bandpass ndipo imagwira ntchito mu bandeji ya 76-108MHz.

Ubwino wogwiritsa ntchito tepi iyi ndikuti ili ndi gawo loyambira pamwamba komanso pansi pa gulu la FM. Izi zimapangitsa kusunthika pang'ono kwa njira zina. Chojambulira ndichakufota ndizovuta kwambiri kupeza.

Pochita izi, fayilo imalowetsa 39pF capacitor, pomwe maziko apakati pa fayilo yolumikizira ku PC board lapansi. Ichi ndichifukwa chake pali bowo pakati pa 39pF capacitor yomwe imatsogolera. Ma 39pF ndi 3.3pF capacitor ndi ma 68nH ndi 680nH inductors ndiye safunika, pomwe 68nH inductor imasinthidwa ndi ulalo wam waya.

Zambiri

Dinani kuti mupeze chithunzi chachikulu

Mtini.5 (a): chithunzi ichi chikuwonetsa momwe mbali zinayi zakumaso zimayikidwira mbali yamkuwa ya bolodi la PC. Onetsetsani kuti IC1 & VC1 ndiyowona molondola.

Fotokozerani ku Fig.4 pamasewera athunthu a Stereo FM Micromitter. Monga zikuyembekezeredwa, IC1 imapanga gawo lalikulu la madera omwe ali ndizinthu zingapo zomwe zimawonjezeredwa kuti amalize kufalitsa uthenga wa FM stereo.

Zoyimira kumanzere kumanja ndi kumanzere kumadyetsedwa kudzera mu 1μF bipolar capacitors kenako ndikuyika kwa masiteti a attenuator omwe amakhala ndi 10kΩ othandizira othana ndi 10kΩ trimpots (VR1 & VR2). Kuchokera pamenepo, ma siginecha amaphatikizidwa kukhala zikhomo 1 & 22 za IC1 kudzera pa 1μF electrolytic capacitors.

Dziwani kuti 1μF bipolar capacitors imaphatikizidwa kuti iteteze DC yomwe ikuyenda pano chifukwa cha zolakwika zilizonse za DC pazotsatira zake. Mofananamo, ma capacitor a 1μF okhala ndi zikhomo 1 & 22 ndi ofunika kuteteza DC pakalipano, chifukwa zikhomo ziwirizi ndizopanda theka. Njanji yamagetsi yamagetsi iyi yakonzedwanso pogwiritsa ntchito 10μF capacitor pa Pin 4 ya IC1.

Ma capacitor a 2.2nF olimbitsa thupi ali pa mapiri 2 & 21, pomwe ma capacitor a 150pF ali ndi zikhomo 3 & 20 akhazikitsa gawo loyambira lofika. Mulingo woyendetsa ungayikidwe ndi capacitor pa pini 19 -, komabe, izi sizofunikira kwenikweni popeza mulingo nthawi zambiri umakhala wabwino popanda kuwonjezera capacitor.

M'malo mwake, kuwonjezera capacitor pano kumangochepetsa kusiyana kwa ma stereo chifukwa gawo la mawu oyendetsa ndege limasinthidwa poyerekeza ndi kuchuluka kwa 38kHz.

Oscillator wa 7.6MHz amapangidwa mwa kulumikiza kristalo wa 7.6MHz pakati pa zikhomo 13 & 14. Pochita izi, kristalo uyu amalumikizidwa limodzi ndi gawo la inverter. Kristalo imayika kusinthasintha kwa oscillation, pomwe ma 27pF capacitors amapereka kutulutsa koyenera.

Dinani kuti mupeze chithunzi chachikulu

Fig.5 (b): nayi momwe mungakhazikitsire zigawo kumtunda kwa bolodi la PC kuti mupange mtundu wa plukupack-powered. Dziwani kuti IC1, VC1 ndi 68nH & 680nH inductors ndizida zopangira ndipo zayikidwa kumbali yamkuwa ya bolodi monga zikuwonekera pa mkuyu.5 (a)

Divider yomwe ikhoza kusinthidwa (kapena pulogalamu yotsutsana ndi pulogalamu) imakhazikitsidwa pogwiritsa ntchito zosinthira pamapini 15, 16, 17 & 18 (D0-D3). Izi zimalowa nthawi zambiri zimakwera kudzera pa 10kΩ resistors ndikutsitsidwa pansi pomwe zotsekera zimatsekedwa. Gome 1 ikuwonetsa momwe masinthidwe amakhazikitsidwa kuti asankhe imodzi mwamagawo 14 otumizira.

Kutulutsa kwa RF oscillator kuli pini 9. Ichi ndi oscillator wa Colpitts ndipo wokonzedwa pogwiritsa ntchito inductor L1, 33pF & 22pF okhazikika capacitors ndi varicap diode VC1.

33pF yokhazikika capacitor imagwira ntchito ziwiri. Choyamba, imatchinga voliyumu ya DC yomwe idagwiritsidwa ntchito ku VC1 kuti pasakhale madzi kulowa mu L1. Ndipo chachiwiri, chifukwa ndizofanana ndi VC1, zimachepetsa kusintha kwa kusintha kwa varicap, monga "kuwonekera" ndi pini 9.

Izi, zimachepetsa ma frequency angapo a oscillator a RF chifukwa cha kusintha kwamagalasi olamulira a varicap ndikuloleza gawo labwino lotsekeka lotseguka.

Mofananamo, 10pF capacitor imalepheretsa kuyenda kwa DC kulowa L1 kuchokera pa pini 9. Mtengo wake wotsika umatanthauzanso kuti gawo lozungulira limangolumikizidwa ndipo izi zimapereka mwayi wapamwamba wa Q pamayendedwe osavuta komanso kuyamba kosavuta kwa oscillator.

Kutembenuza oscillator

Dinani kuti mupeze chithunzi chachikulu

Mkuyu.6: nayi momwe mungasinthire bolodi kuti isinthidwe ndi batri. Kungofunika kusiya D1, ZD1 & REG1 ndikukhazikitsa maulalo angapo a waya.

Chizindikiro cha zophatikizika chimawonekera pini 5 ndipo chimadyetsedwa kudzera mwa 10μF capacitor kuti trimpot VR3. Izi trimpot imayika kuzama kwa kusinthasintha. Kuchoka pamenepo, siginecha yotumizidwa imadyetsedwa kudzera pa 10μF capacitor yina ndi zida ziwiri za 10kΩ kuti varicap diode VC1.

Monga tanena kale, gawo lotsekera loops control (PLL) pa pini 7 limagwiritsidwa ntchito kuwongolera pafupipafupi. Izi zimayendetsa phindu lalikulu la Darlington transistor Q1 ndipo izi zimagwiritsa ntchito magetsi ku VC1 kudzera pamaulalo awiri oyeserera a 3.3kΩ komanso 10kΩ yopatula.

Capacitor ya 2.2nF pamtunda wa zida ziwiri za 3.3kΩ imapereka kusefukira kwapamwamba kwambiri.

Zosefera zowonjezera zimaperekedwa ndi 100μF capacitor ndi 100Ω assistor yolumikizidwa mndandanda pakati pa maziko a Q1 ndi osonkhetsa. Otsutsa a 100Ω amalola transistor kuyankha kusintha kwakanthawi, pomwe 100μF capacitor imapereka mafayilo ochepetsa. Zosefera zowonjezereka kwambiri zimaperekedwa ndi 47nF capacitor yolumikizidwa mwachindunji pakati pa maziko a Q1 ndi osonkhetsa.

Chowongolera cha 5.1kΩ cholumikizidwa ndi njanji ya 5V chimapereka chosonkhanitsa. Chotsutsa ichi chimakweza wosonkhetsa Q1 pamwamba pomwe transistor imachoka.

Kutulutsa kwa FM

Zotsatira za RF zosinthika zimawonekera pini 11 ndipo zimapatsidwa zosefera la LC bandpass. Ntchito yake ndikuchotsa ma harmonics aliwonse omwe amapangidwa ndi kusinthidwa ndi RF oscillator. Kwenikweni, fyuluta imadutsa pafupipafupi mu gulu la 88-108MHz koma imatulutsira mawu pafupipafupi ndi pansi pa izi.

Zosefera zili ndi kuphwanya koyenera kwa 75Ω ndipo izi zikufanana ndi zotsatsira zonse za IC1 11 ndi gawo lotsatira la attenuator.

Otsutsa awiri a 39Ω ndi othandizira a 56W shunt resistor amapanga phula ndipo izi zimachepetsa mulingo wazizindikirozo. Izi zowunikira ndikofunikira kuti zitsimikizire kuti wogulitsa amagwira ntchito movomerezeka mwa 10μW.

mphamvu chakudya

Dinani kuti mupeze chithunzi chachikulu

Mkuyu.7: chithunzi ichi chikuwonetsa tsatanetsatane wa zoyeserera za L1. Zoyambazo zimakonzedwa kuti zisakwane 13mm pamwamba pa bolodi. Gwiritsani ntchito silicone sealant kuti musunge zakale m'malo mwake, ngati zingafunike.

Mphamvu yamagawo ozungulira amachokera ku 9-16V DC plukupack kapena batri ya 6V.

Pankhani ya plukupack yamagetsi, mphamvu imapatsidwa kudzera pa swichi S5 ndi diode D1 yomwe imapereka chitetezo chosinthana ndi polarity. ZD1 imateteza zozungulira kuzungulira pang'onopang'ono, pomwe owongolera REG1 amapereka njanji yolimba + 5V kuti iziyendetsa dera.

Mwinanso, pa opaleshoni ya batire, ZD1, D1 ndi REG1 sagwiritsidwa ntchito ndipo kulumikizana kwa D1 ndi REG1 kufupikitsidwa. Kutulutsa kokwanira kokwanira kwambiri kwa IC1 ndi 7V, motero kuyendetsa batire ya 6V ndi koyenera; mwachitsanzo, maselo a 4 x AAA okhala ndi 4 x AAA.

yomanga

Bolodi imodzi ya PC yokhala ndi zilembo za 06112021 ndipo yoyezera 78 x 50mm imagwira zigawo zonse za Micromitter. Izi zimayikidwa mu pepala la pulasitiki lolemera 83 x 54 x 30mm.

Choyamba, onetsetsani kuti bolodi la PC likuyenererana bwino. Makona angafunike kujambulidwa kuti athe kupindika pazipilala zapakona pabokosi. Kuti mwachita, onetsetsani kuti mabowo a zitsulo za DC ndi RCA zitsulo ndizoyenera. Ngati zomwe L1 yakale ilibe maziko (onani pansipa), imayikidwa pakukankhira mu dzenje lomwe limangomangika mokwanira kuti likhazikike. Onani kuti dzenje ili ndi mulingo woyenera.

Fig.5 (a) & Fig.5 (b) amawonetsa momwe zigawo zimakhazikitsidwa pa bolodi la PC. Ntchito yoyamba ndikukhazikitsa zinthu zingapo zapamwamba kumbali yamkuwa ya PC. Zigawozi zikuphatikiza IC1, VC1 ndi ma inductors awiri.

Mufunika chitsulo chamoto wopaka bwino, ma tipiers, kuwala kolimba ndigalasi lokulitsa ntchito iyi. Makamaka, nsonga yachitsulo chosinthira iyenera kusinthidwa ndikuisanja kuti ikhale yopapatiza screwdriver.

Dinani kuti mupeze chithunzi chachikulu

Ndikofunika kukhazikitsa mbali zinayi zoyambirira (kuphatikiza IC), musanakhazikitse mbali zotsalazo pamwamba pa bolodi la PC. Zindikirani momwe thupi lamalirilo limagona pa oyandikana ndi 10kΩ othandizira (chithunzi kumanzere).

IC1 ndi varicap diode (VC1) ndi zida zapamwamba, onetsetsani kuwongolera monga momwe kukuwonetsedwera. Gawo lirilonse limayikidwa ndikuligwirizira ndikukhala ndi ma tweezers kenako ndikugulitsa lead imodzi (kapena pini) choyamba. Kuti mwachita, onani kuti chipangizocho chimayikidwa molondola musanayambe kugulitsa ma lead kapena otsala.

Pankhani ya IC, ndibwino kuti muziyika kaye pang'onopang'ono mbali iliyonse ya zikhomo musanayiyike pa PC. Ndiye ndi nkhani yotenthetsera chitsotso chilichonse ndi nsonga yazitsulo kuti ingogulitsenso m'malo mwake.

Onetsetsani kuti mukugwiritsa ntchito kuwala kolimba ndigalasi lopatsa mphamvu pantchitoyi. Izi sizingapangitse kuti ntchitoyo ikhale yophweka komanso zidzakuthandizani kuti muone momwe zimapangidwira. Makamaka, onetsetsani kuti palibe zazifupi pakati pa masitepe oyandikana kapena zikhomo za IC.

Pomaliza, gwiritsani ntchito ma multimeter anu kuti muwone ngati pini iliyonse ilumikizidwa ku track yawo pa PC board.

Zotsala zonsezo zimayikidwa mbali yakumanja kwa PC bolodi mwa nthawi zonse. Ngati mukumanga pulogalamu yoyatsidwa ndi pulogalamu yamatsenga, tsatirani chithunzithunzi chofanizira. Kapenanso, pa batri yoyendetsedwa ndi batri, siyani ZD5 ndi socket ya DC ndikusintha ma D1 & REG1 ndi maulalo a waya monga akuwonetsera mu Fig.1.

Msonkhano wapamwamba

Yambitsani msonkhano wapamwamba pakukhazikitsa ma resistors ndi maulalo a waya. Tebulo 3 likuwonetsa makina amtundu wa resistor koma tikulimbikitsanso kuti mugwiritse ntchito ma multimeter a digito kuti muwonetsetse momwe mulili. Dziwani kuti ambiri mwa otsutsa amaikidwa kuti ateteze malo.

Otsutsa akangolowa, ikani mitengo ya PC pazotsatira za antenna ndi TP GND ndi malo oyesera a TP1. Izi zipangitsa kuti zikhale zosavuta kulumikizana ndi mfundo izi mtsogolo.

Kenako, ikani ma trimpots VR1-VR3 ndi PC-phiri RCA zigawo. Soketi ya DC, diode D1 ndi ZD1 ikhoza kuyikidwira kuti ikhale pulogalamu yoyeserera ya plukupack.

Ma capacitor amatha kupita patsogolo, kusamalira kukhazikitsa mitundu yama electrolytic ndi polarity yoyenera. Mitundu yamagetsi ya NP (yopanda polarized) kapena ya bipolar (BP) ikhoza kukhazikitsidwa mwanjira iliyonse. Awakankhire pansi mpaka m'maenje awo okwera, kuti asakhale oposa 13mm pamwamba pa bolodi la PC (uku ndikulola kuti chivundikirocho chikwanire molondola mabatire a AAA akaikidwa pansi pa bolodi la PC mkati mwa bokosi).

Ma ceramic capacitors amathanso kuikika panthawiyi. Tebulo 2 limawonetsera zizindikiro zawo, kuti zikhale zosavuta kuti muzindikire zomwe mukutsatira.

Coil L1

Mkuyu.7 ikuwonetsa tsatanetsatane wa kozungulira L1. Imakhala ndi ma 2.5 kutembenuka kwa 0.5 - 1mm enamelled waya wamkuwa (ECW) pa bala lozungulira lomwe linali ndi F29 ferrite slug. Mwinanso, mutha kugwiritsanso ntchito kola iliyonse yamalonda ya 2.5 yotembenuka.

Mitundu iwiri yaopangira ilipo - imodzi yokhala ndi pini ya 2 (yomwe ingagulitsidwe mwachindunji kwa PC board) ndi imodzi yomwe imabwera popanda maziko. Ngati yakale ili ndi maziko, iyenera kufupikitsidwa pafupi ndi 2mm, kuti kutalika kwake (kuphatikiza pansi) ndi 13mm. Izi zitha kuchitika pogwiritsa ntchito hacksaw yopangidwa bwino.

Kuti zitheke, kuthana ndi coil, kutsirizitsa malembawo mwachindunji pazikhomo ndikugulitsa coil. Dziwani kuti kutembenuka kumayandikana wina ndi mnzake (mwachitsanzo, coil ndi bala pafupi).

Dinani kuti mupeze chithunzi chachikulu

Chithunzichi chikuwonetsa momwe mlanduwo umayendetsedwera kuti mutenge zigawo za RCA, zitsulo zamagetsi ndikuwongolera kwa antenna.

Mwanjira ina, ngati yoyambayo ilibe maziko, dulani kolala kumapeto kwake, ndiye kuti kokerani bolodi pa PC board pa L1 pamalo kuti oyambayo akhale olimba. Tachita izi, ndikulungitsani chimbaliracho mu dzenje lake, kenako ndikulowetsani coil kotero kuti kutsika kotsika kumakhala pamwamba pa bolodi.

Onetsetsani kuti mukuchotsa kutchinga kwa waya kusanachitike musanagulitse zomwe zidzatsogolera ku PC board. Ma dabs ochepa a silicone sealant amatha kugwiritsidwa ntchito kuonetsetsa kuti coil wakale amakhala m'malo mwake.

Pomaliza, ferrite slug ikhoza kuyikidwira mu yakale ndikuyika sikelo kuti pamwamba pake pakhale posachedwa ndi pamwamba pa yakale. Gwiritsani ntchito chida choyimira bwino cha pulasitiki kapena chamkuwa kuti muswe mu slug - screwdriver wamba ikhoza kusokoneza ferrite.

Crystal X1 tsopano ikhoza kukhazikitsidwa. Ichi chimakwezedwa poyambira kutsogoza kutsogoleredwa ndi madigiri 90, kotero kuti chimakhala chammbali mozungulira mbali ziwiri zoyandikira 10kΩ (onani chithunzi). Msonkhano wa bolodi tsopano ukhoza kutsirizika ndikuyika DIP switch, transistor Q1, Administrator (REG1) ndi kutsogolera kwa antenna.

Tinyanga tating'onoting'ono tangokhala mtundu wa mafunde. Imakhala ndi waya wa 1.5m kutalika kwa inshuwaransi, pomwe malekezero amodzi amagulitsidwa kwa matenthedwe a antenna. Izi zikuyenera kupereka zotsatira zabwino pamlingo wofalitsira.

Kukonzekera mlandu

Chidziwitso tsopano chitha kuphatikizidwa ku mlandu wapulasitiki. Izi zimafunikira mabowo kumapeto amodzi kuti zithetse zigawo za RCA, kuphatikiza mabowo kumapeto ena kuti azitsogolera antenna ndi DC mphamvu socket (ngati itagwiritsidwa ntchito).

Kuphatikiza apo, bowo liyenera kukumbidwira mu chivundikiro cha magetsi.

Dinani kuti mupeze chithunzi chachikulu

Dera limatha kuwongoleredwa kuchokera ku maselo a 4 x 1.5V AAA ngati mukufuna kuthandizira gawo. Dziwani kuti wogwirizira batri amafunikira kusinthidwa kuti ikwaniritse zonse mkati mwa chochitikacho (onani mawu).

Ndikofunikanso kuchotsa maumbidwe apakati mkati mwa makhoma a mlanduwo mpaka pakuya 15mm pansi m'mphepete mwa bokosilo, kuti mugwirizane ndi bolodi la PC. Tinagwiritsa ntchito chisila chakuthwa kuti tichotse izi koma chopukusira chaching'ono chitha kugwiritsidwa ntchito m'malo mwake. Zomwe mwachitazi, mukufunikiranso kuchotsa nthiti zomaliza pansi pa chivindikiro kuti mutsegule nsonga za zigawo za RCA ndi DC. Zolemba kumbuyo

Mtundu wamagetsi opangidwa ndi batri umakhala ndi cholembera cha AAA choyimilira mozungulira m'bokosilo, pomwe maziko ake ali olumikizana ndi mbali yamkuwa ya PC bolodi. Pali chipinda chokwanira chogwirizira ichi ndi bolodi ya PC kuti ikhale mkati mwawowo ndi zotsimikizira zotsatirazi:

(1). Magawo onse kupatula magetsi osinthira S5 sayenera kutuluka pamwamba pa bolodi la PC kupitirira 13mm. Izi zikutanthauza kuti ma electrolytic capacitors ayenera kukhala pafupi ndi bolodi la PC ndikuti omwe anali a L1 ayenera kudulidwa mpaka kutalika kolondola.

(2). Cholembera cha AAA ndi pafupifupi 1mm kwambiri ndikuyikidwa pansi kumapeto kwake, kotero kuti maselo amatuluka pang'ono pamwamba pa wogwirizira.

(3). Nsonga za zigawo za RCA zingafunikenso kumetedwa pang'ono, kotero kuti palibe kusiyana pakati pa bokosi ndi chivindikiro mutatha msonkhano.

ACA Mgwirizano

Izi transmitter radio ya FM yimbale ikuyenera kutsatira Radiocommunication Low Interaction Potential Devices (LIPD) Class License 2000, monga momwe bungwe la Australia likuyankhulira.

Makamaka, kufalikira kotsimikizika kuyenera kukhala mkati mwa gulu la 88-108MHz pa EIRP (Mphamvu Yofanana Yotulutsa Mphamvu ya) ya 10mW komanso ndi mawu a FM osaposa 180kHz bandwidth. Kutumiza sikungakhale pa pafupipafupi monga pawaulutsa mawu pawailesi (kapena wobwereza kapena malo omasulira) ogwiritsira ntchito malo a layisensi.

Zambiri zitha kupezeka pa www.aca.gov.au webusaiti.

Chidziwitso cha chiphaso cha kalasi cha LIPD chitha kutsitsidwa pa:
www.aca.gov.au/aca_home/legislation/radcomm/class_licences/lipd.htm

Yesani & kusintha

Gawo ili ndi zokhwasula-khwasula. Ntchito yoyamba ndikupanga L1 kotero kuti RF oscillator imagwira ntchito molondola. Kuti muchite izi, tsatirani izi mwatsatanetsatane:

(1). Khazikitsani mafayilo opatsirana pogwiritsa ntchito ma switch a DIP, monga akuwonetsera pa Tebulo 1. Dziwani kuti muyenera kusankha mafupipafupi omwe sagwiritsidwe ntchito ngati malo ogulitsira mdera lanu, apo ayi kusokoneza kudzakhala vuto.

(2). Lumikizani chiwongolero chanu chodziwika bwino ku TP GND ndi chitsogozo chake cholondola cha 8 1 cha IC5. Sankhani mawonekedwe a DC volts pa mita, ikani mphamvu pa Micromitter ndikuwonetsetsa kuti mupeze kuwerenga komwe kuli pafupi ndi XNUMXV ngati mukugwiritsa ntchito plugack ya DC.

Mwinanso, mita ikuyenera kuwonetsa voliyumu ya batri ngati mukugwiritsa ntchito maselo a AAA.

(3). Sunthani patsogolo ma multimeter abwino kupita ku TP1 ndikusintha slug mu L1 kuti muwerenge pafupifupi 2V.

Dinani kuti mupeze chithunzi chachikulu

Wogwirizira batiri amakhala pansi pamlandu, pansi pa bolodi la PC.

Oscillator tsopano adakwanilitsidwa. Palibe kusintha kwina kwa L1 komwe kungafunike ngati mutasinthira pafupipafupi kumagulu osankhidwa. Komabe, ngati mungasinthe kukhala pafupipafupi mu gulu linalo, L1 iyenera kusinthidwa kuti kuwerenga 2V ku TP1.

Kukhazikitsa anyani

Mkuyu.8: zojambula zazitali kwambiri

Zomwe zatsalira pano ndikusintha ma trimpots VR1-VR3 kukhazikitsa mulingo wa chizindikiridwe komanso kuya kwa kusinthasintha. Njira ya tsatane-tsatane ndi motere:

(1). Khazikitsani VR1, VR2 & VR3 m'malo awo apakati. VR1 ndi VR2 imatha kusinthidwa ndikudutsa screwdriver kudutsa m'malo a RCA μ, pomwe VR3 imatha kusinthidwa ndikusunthira μF capacitor kutsogolo kwake mbali imodzi.

(2). Lumikizani chimbudzi cha stereo FM kapena wailesi kumawayilesi ambiri. Woyeserera wa FM ndi transmitter poyamba amayenera kuyikidwa pafupi mita awiri.

(3). Lumikizani gwero la sigiriyo (mwachitsanzo, wosewerera CD) ku zolumikizira za RCA ndikuwona ngati izi zalandiridwa ndi tuner kapena wailesi.

Mkuyu.9: makulidwe opanga a PC.

(4). Sinthani anticlockwise ya VR3 mpaka chizindikirocho chikafika pa wolandirayo, kenako sinthani VR3 mwanjira iyi pofika 1/8 potembenukira.

(5). Sinthani VR1 ndi VR2 kuti mukhale ndi phokoso labwino kwambiri kuchokera pa kontrakitala - mudzayenera kuyimitsa kanthawi kochepa siginolo kuti musinthe chilichonse. Pakuyenera kukhala ndi chizindikirocho chokwanira choti 'chithetse' phokoso lililonse lakumbuyo koma osasokoneza.

Zindikirani makamaka kuti VR1 ndi VR2 ziyenera kukhala pamalo amodzi, kukhalabe ndi njira yolondola.

Ndizomwezo - Stereo FM Micromitter yanu yakonzeka kuchitapo kanthu.

Gome 2: Makhodi a Capacitor
mtengo Code ya IEC Code ya EIA
47nF 47n 473
10nF 10n 103
2.2nF 2n2 222
330pF 330p 331
150pF 150p 151
39pF 39p 39
33pF 33p 33
27pF 27p 27
22pF 22p 22
10pF 10p 10
3.3pF 3p3 3.3
Gome 3: Resistor Colodi
No. mtengo Khodi ya 4-Band (1%) Khodi ya 5-Band (1%)
1 22kΩ bulauni ofiira ofiira ofiira ofiira ofiira
8 10kΩ bulauni wakuda lalanje zofiirira zakuda zakuda zakuda
1 5.1kΩ bulawuni wofiirira wobiriwira bulawuni wobiriwira wakuda bulauni
2 3.3kΩ lalanje lofiirira lalanje lalanje lalanje wakuda bulauni
1 100Ω zofiirira zakuda zofiirira zofiirira zakuda zakuda zakuda
1 56Ω bulawuu wobiriwira wakuda buluu wakuda wabuluu wakuda bulauni
2 39Ω lalanje yoyera yakuda lalanje loyera golide wakuda
mbali List

1 PC bolodi, code 06112021, 78 x 50mm.
Bokosi 1 lothandizira pulasitiki, 83 x 54 x 31mm
1 kutsogolo gulu, 79 x 49mm
1 7.6MHz kapena 7.68MHz kristalo
1 SPDT subminiature switch (Jaycar ST-0300, Altronics S 1415 kapena equiv.) (S5)
Ma PC 2 a Mount RCA (asinthidwa) (Altronics P 0209, Jaycar PS 0279)
1 2.5mm PC-phiri DC mphamvu zenera
1 4-way DIP switch
1 2.5 kutembenuka kozungulira (L1)
1 4mm F29 ferrite slug
1 680nH (0.68μH) pamwamba paphiri la inductor (1210A kesi) (Farnell 608-282 kapena ofanana)
1 68nH pamalo okwera inductor (0603 kesi) (Farnell 323-7886 kapena ofanana)
Kutalika kwa 1 100mm kwa waya wa mkuwa
Kutalika kwa 1 50mm kwa waya wamkuwa
Kutalika kwa 1m kwa waya
3 pamtengo
1 4 x AAA yonyamula ma cell (yofunikira pakugwiritsa ntchito batri)
Maselo 4 a AAA (ofunikira pakugwiritsa ntchito batri)
Ma trimpots 3 10kΩ ofukula (VR1-VR3)

Semiconductors

1 BH1417F Rohm yopumira patali ya FM stereo (IC1)
1 78L05 yamagetsi ochepera mphamvu (REG1)
1 MPSA13 Darlington transistor (Q1)
1 ZMV833ATA kapena MV2109 (VC1)
1 24V 1W zener diode (ZD1)
1 1N914, 1N4148 diode (D1)

Capacitors

2 100μF 16VW PC electrolytic
5 10μF 25VW PC electrolytic
2 1μF kupumira pakompyuta
2 1μF 16VW electrolytic
1 47nF (.047μF) poltota ya MKT
2 10nF (.01μF) ceramic
3 2.2nF (.0022μF) poltota ya MKT
1 330pF ceramic
2 150pF ceramic
1 39pF ceramic
1 33pF ceramic
2 27pF ceramic
1 22pF ceramic
1 10pF ceramic
1 3.3pF ceramic

Resistors (0.25W, 1%)

1 22kΩ 1 100Ω
8 10kΩ 1 56Ω
1 5.1kΩ 2 39Ω
2 3.3kΩ

zofunika
Maulendo opatsirana 87.7MHz mpaka 88.9MHz mu masitepe a 0.2MHz
106.7MHz mpaka 107.9MHz mu masitepe a 0.2MMz
Kukula konse kwa Harmonic (THD) ambiri 0.1%
Kutsindika ambiri 50ms
Zosefera Zapansi 15kHz / 20dB / zaka khumi
Kupatukana kwa njira ambiri 40dB
Sewero labwino mkati? 2dB (imatha kusinthidwa ndi ma trimpots)
Kuyendetsa ma pilot 15%
Mphamvu ya RF Output (EIRP) Nthawi zambiri 10μW mukamagwiritsa ntchito inebilt attenuator
Thirani magetsi 4-6V
Zowonjezera pano 28mA pa 5V
Mulingo wa kulowetsa mawu 220mV RMS okwera pa 400Hz ndi kuchepera kwa compression ya 1dB
Mutha kugula malonda omwe atchulidwa m'nkhaniyi apa:

ST0300: SUB-MINI TOGGLE SPDT Wogulitsa TAG WAKULULA

Kutsitsa kwotsatiraku kulipo pankhaniyi: