DIY Micromitter tsa stereo FM e fetisang

Khabareng - transmitter ea stereo FM e senang mohono ho hokahanya.

Studio ena e ncha ea Stereo FM e khona ho phatlalatsa lipontšo tse ntle tsa boleng bo fetang limithara tse 20. E loketse ho hasanya 'mino ho tsoa ho sebapali sa CD kapa ho tsoa mohloling ofe kapa ofe e le hore o ka khethoa sebakeng se seng.

Mohlala, haeba u se na sebapali sa CD ka koloing ea hau, u ka sebelisa Micromitter ho phatlalatsa lipontšo ho tloha sebapali sa CD se nkehang ho ea radion ea koloi ea hau. Ntle le moo, u ka batla ho sebelisa Micromitter ho phatlalatsa lipapatso ho tloha sebapali sa CD sa hau sa kamore ea ho phomola ho moamoheli oa FM o karolong e 'ngoe ea ntlo kapa letamong.

Hobane e thehiloe ho IC e le 'ngoe, karolo ena ke seneke sa ho e haha ​​le ho kenella habonolo ka lebokoseng le lenyane la lisebelisoa. E hasoa ho lebatooa la FM (ke hore, 88-108MHz) e le hore lets'oao la eona le ka amoheloa ho tuner e tloaelehileng ea FM kapa radio e nkehang.

Leha ho le joalo, ho fapana le li-transmitter tsa FM tse fetileng tse phatlalalitsoeng ho SILICON CHIP, moralo ona o mocha ha o feto-fetohe ka mokhoa o tsoelang pele holim'a sehlopha sa seea-le-moea sa FM. Sebakeng seo, switch ea DIP ea 4-way e sebelisoa ho khetha e 'ngoe ea likhahla tse 14 tse behiloeng pele. Tsena li fumaneha ka mekhahlelo e 'meli e koahelang ho tloha 87.7-88.9MHz le 106.7-107.9MHz ka mehato ea 0.2MHz.

Ha ho na coils

Tobetsa bakeng sa setšoantšo se seholoanyane

Setempe.1: setšoantšo sa block ea Rohm BH1417F stereo FM. Sengoloa se hlalosa hore na se sebetsa joang.

Re qalile ho phatlalatsa transmitter ea FM stereo ho SILICON CHIP ka Mphalane 1988 mme ra latela sena ka phetolelo e ncha ka Mmesa 2001. Ka ho bitsoa Minimitter, liphetolelo tsena tsa pejana li ne li thehiloe Rohm BA1404 IC e seng e sa hlahisoe hape.

Likarolong tsena ka bobeli, ts'ebetso ea ho hokahanya e hloka ho fetoloa ka hloko ha sekhahla sa mochini oa ferrite ka har'a li-coil tse peli (coil ea oscillator le coil ea filthara), e le hore tlhahiso ea RF e tšoane le maqhubu a khethiloeng ho Moamoheli oa FM. Leha ho le joalo, lihahi tse ling li ile tsa thatafalloa ke sena hobane phetoho eo e ne e tebile.

Haholo-holo, haeba u ne u e-na le moamoheli oa FM, o ne o lokela ho beha moamoheli ho frequency e itseng ebe o hlophisa "frequency" ea "transmitter" ka eona. Ntle le moo, ho bile le tšebelisano pakeng tsa oscillator le liphetoho tsa coil mme sena se ferekanya batho ba bang.

Bothata bona ha bo na moralo ona o mocha, hobane ha ho na mokhoa oa ho tsamaisana khafetsa. Sebakeng seo, sohle se o lokelang ho se etsa ke ho beha frequency ea transmitter o sebelisa switch-4-DIP switch ebe o penya moqhubu o hlophisitsoeng lenaneong la hau la FM.

Kamora moo, ke taba feela ea ho lokisa coil e le 'ngoe ha u theha transmitter, ho ipehela ts'ebetso e nepahetseng ea RF.

Litlhahiso tse ntlafalitsoeng

Radio Stereo Micromitter e ncha e se e notletsoe ka kristale ho bolelang hore yuniti ha e tloheloe ke nako khafetsa. Ntle le moo, ho khopama, karohano ea litheko, karolelano ea lerata le ho koaloa ha literene li ntlafalitsoe haholo setsing sena se secha ha se bapisoa le meralo ea pejana. Iphanele ea litlhaloso e na le lintlha tse ling.

BH1417F fetisang edy

Tobetsa bakeng sa setšoantšo se seholoanyane

Setempe sa 2: morero ona oa khafetsa o bapisoang le boemo ba phumano o bonts'a boemo ba karolo ea 'mele (pin 5). Khatello ea pele ea 50ms nakong ea 3kHz e baka karabelo, ha molumo o tlase oa 15kHz o hlahisa ho putlama ho arabela ka holimo ho 10kHz.

Bophelong ba moralo o mocha ke ICH ea BH1417F FM stereo e entsoeng ke Rhom Corporation. Joalokaha ho se ho boletsoe, e nkela sebaka se thata joale ho fumana BA1404 e kileng ea sebelisoa meralong e fetileng.

Fig.1 e bonts'a likarolo tsa kahare tsa BH1417F. E kenyelletsa "potoloho" tsohle tse hlokahalang bakeng sa phetisetso ea Stereo FM le karolo ea taolo ea kristale e fanang ka likhahla tse nepahetseng tsa maqhubu.

Joalokaha ho bontšitsoe, BH1417F e kenyelletsa likarolo tse peli tse arohaneng tsa molumo oa audio, bakeng sa liteishene tse ka ho le letšehali le ka ho le letona. Leqhubu la molatsoana oa molatsoana oa leqeleng le sebelisoa ho pina ea 22 ea chip, ha lets'oao le letona le sebelisoa ho pina ea 1. Maqhubu ana a molumo a kenngoa potolohong ea pele ho khothaletso e eketsang maqhubu ana ka hofihlela nako ea 50ms kamehla (ke hore, maqhubu ao kaholimo ho 3.183kHz) pele a fetisoa.

Ha e le hantle, ho hatisoa pele ho sebelisoa ho ntlafatsa tekanyo ea molumo oa lets'oao la FM le amohelang. E sebetsa ka ho sebelisa potoloho e tlatselletsang mohopolong ho amohelang maqhubu a matlafatsang kamora ho beleha, e le hore karabelo ea khafetsa e khutlisetsoe ho tloaelehileng. Ka nako e ts'oanang, sena le sona se fokotsa haholo maikutlo a neng a tla bonahala ka pontšo.

Bohlokoa ba ho hatella pele bo behiloe ka boleng ba li-capacitor tse hokahantsoeng le lipini tsa 2 & 21 (hlokomela: boleng ba nako e sa lekanyetsoang = 22.7kΩ x boleng ba bokhoni). Sebakeng sa rona, re sebelisa li-capacitor tsa 2.2nF ho beha litlhatlhobo tsa pele ho 50μs e leng standard ea FM FM.

Ho beha lipontšo ho boetse ho fanoa ka har'a karolo ea pele ea ho hatella. Sena se kenyelletsa ho kenya matšoao ka holimo ho monyako o itseng, ho thibela ho jarolla methati e latelang. Ka lehlakoreng le leng, sena se thibela ho feto-fetoha ho feteletseng le ho fokotsa ho khopama.

Matšoao a boletsoeng esale pele bakeng sa liteishene tse ka ho le letšehali le ka ho le letona a sebetsoa ka mekhahlelo e 'meli e tlase-ea-filter (LPF), e arabang karabelo e kaholimo ho 15kHz. Rolloff ena e ea hlokahala ho thibela bandwidth ea lets'oao la FM mme ke moeli o tšoanang oa maqhubu o sebelisoang ke bapalami ba litaba tsa Lesedi la radio.

Tobetsa bakeng sa setšoantšo se seholoanyane

Feiga.3: ponts'o ea khafetsa ea lets'oao la "compereite" ea "stereo FM". Ela hloko sepheo sa molumo oa sefofane ho 19kHz.

Liphetho tse tsoang ka letsohong le letšehali le ka ho le letona li sebelisoa ka har'a block. Sena se sebelisetsoa ho hlahisa lipontšuoa tsa kakaretso (ka ho le letšehali le ka ho le letona) le lipapatso (leqeleng - ka ho le letšehali) ebe li fetoloa ho moetsi oa 38kHz. Ebe morekisi o hatelloa (kapa o tlosoe) ho fana ka lets'oao la mokokotlo le hatisitsoeng habeli. E ntan'o tsoakoa ka khutsufatso (+) block le molumo oa sefofane sa 19kHz ho fana ka phumano ea lets'oao le kopantseng (ka kh'outo e felletseng ea stereo) ho pina ea 5.

Karolo le boemo ba molumo oa sefofane sa 19kHz li thehiloe ho sebelisoa capacitor ho pini ea 19.

Feiga.3 e bonts'a ponts'o ea lets'oao la "compereite stereo". Letshwao la (L + R) le nka sebaka sa makgetlo a mangata ho tloha ho 0-15kHz. Ka lehlakoreng le leng, lets'oao le tsamaisang likarolo tse peli le hatelletseng (LR) le na le lehlakore le ka lehlakoreng le ka tlase le tlohang ho 23-38kHz le lehlakoreng le kaholimo ho 38-53kHz. Joalokaha ho hlokometsoe, moetsi oa 38kHz ha a eo.

Molumo oa sefofane sa 19kHz o teng, leha ho le joalo, 'me sena se sebelisoa ho moamoheli oa FM ho hlophisa mokokotlo oa 38kHz e le hore lets'oao la stereo le tsebe ho phatlalatsoa.

Letšoao la phapanyetsano ea 38kHz le molumo oa sefofane sa 19kHz li nkiloe ka ho arola mochini oa "oscillator oa 7.6MHz" o fumanehang lipaketeng tsa 13 le 14. Motsoako ona o aroloa ke ba bane ho fumana 1.9MHz ebe o aroloa ka 50 ho fumana 38kHz. Sena se aroloa ke ba babeli ho fumana molumo oa sefofane sa 19kHz.

Ntle le moo, lets'oao la 1.9MHz le arotsoe ke 19 ho fana ka letšoao la 100kHz. Letshwao lena le kenngwa ho setsi sa mekhahlelo le sona se lekolang phumano ya lenaneo. K'homphieutha ea program ena ha e le hantle e arolelana mochini o hlahisang boleng bo arotsoeng ba letšoao la RF.

Karolelano ea karohano ea mochini ona e thehiloe ke litekanyetso tsa motlakase ho lipalo tsa D0-D3 (lip 15-18). Mohlala, ha D0-D3 kaofela e le tlase, mochini o ka arolelanoang ka 877. Kahoo, haeba RF oscillator e ntse e sebetsa ho 87.7MHz, tlhahiso e arotsoeng ho tsoa ho counter e tla ba 100kHz mme sena se lumellana le maqhubu a arotsoeng ho tloha ho 7.6MHz kristale oscillator (ke hore, 7.6MHz e arotsoe ke 4 e arotsoe ke 19).

Tobetsa bakeng sa setšoantšo se seholoanyane

Fig.4: potoloho e felletseng ea Stereo FM Micromitter. DIP switches S1-S4 e beha frequency ea RF oscillator mme sena se laoloa ke tlhahiso ea PLL ho pin 7 ea IC1. Tlhahiso ena e khanna Q1 eo ka lehlakoreng le leng e sebelisang motlakase ho VC1 ho fapana le bokhoni ba eona. Sesebelisoa sa molumo oa "composite audio" se tsoang ho phini ea bohlano se fana ka modumo oa molumo oa lentsoe.

Ka ts'ebetso, karolo ea sekhahla sa detector ho pin 7 e hlahisa lets'oao la phoso ho laola voltage e sebelisitsoeng ho diode tsa varicap. Varicap diode (VC1) e bonts'oa ho setšoantšo se seholo sa potoloho (sa feiga.4) mme e ba karolo ea RF oscillator ho pini ea 9. Khafetsa khafetsa ea oscillation e khethoa ke boleng ba inductance le matla a tšoanang a kopaneng.

Kaha varicap diode e ba karolo ea bokhoni bona, re ka fetola maqhubu a RF oscillator ka ho fapana ka boleng. Ts'ebetsong, bokhoni ba li-varicap diode bo fapana ka boholo ba motlakase oa DC o sebelisitsoeng ho eona ka tlhahiso ea mochini oa karolo ea PLL.

Ka ts'ebetso, setsi sa methapo se fetola molumo oa li-varicap e le hore maqhubu a arohaneng a RF a 100kHz ketsahalong ea mohanyetsi. Haeba maqhubu a RF a ntse a phahama haholo, tlhahiso e etsahalang khafetsa ho seo e arolelanoang ka eona e phahama mme setsi sa "tla bona" ​​phoso pakeng tsa sena le 100kHz e fanoeng ke sekirine sa kristale.

Ka lebaka leo, mochini o kenyang motlakase o fokotsa motlakase oa DC o sebelisitsoeng ho li-varicap diode, ka tsela eo, o eketsa bokhoni ba ona. 'Me sena se fokotsa leqhubu la oscillator ho le khutlisetsa ho “notlela”.

Ka lehlakoreng le leng, haeba maqhubu a RF a theohela tlase, tlhahiso e ka arolelanoang e tla ba tlase ho 100kHz. Sena se bolela hore mokoloto oa phase joale o eketsa motlakase oa DC ho varicap ho fokotsa matla a eona le ho phahamisa maqhubu a RF. Ka lebaka leo, tlhophiso ea karabo ea PLL e tiisa hore tlhahiso ea karohano e arolelanoang e lula e tsitsitse ho 100kHz mme ka hona e tiisa botsitso ba oscillator ea RF.

Ka ho fetola mohokahanyo o arolelanoang re ka fetola maqhubu a RF. Ka hona, mohlala, haeba re beha sekala bakeng sa 1079, oscillator ea RF e tlameha ho sebetsa ho 107.9MHz bakeng sa tlhahiso e arolelanoang ea divider hore e lule e le 100kHz.

Khafetsa modumo

Ho joalo, e le hore re fetise tlhahisoleseling, re hloka ho feto-fetola molumo oa RF oscillator. Re etsa joalo ka ho feto-fetola molumo o sebelisoang ho diode ea varicap re sebelisa tlhahiso ea lets'oao la motsoako ho pin 5.

Hlokomela, leha ho le joalo, hore frequency ea "oscillator" ea RF (ke hore, frequency frequency) e lula e tsitsitse, joalo ka ha e behiloe ke morekisi ea hlophisitsoeng (kapa moemeli oa lenaneo). Ka lebaka leo, lets'oao le fetisitsoeng la FM le fapana ka mahlakoreng 'ohle a sephethephethe ho latela boemo ba maqhubu a lipapatso - ke ho re, e tsamaisoa hangata.

Tlhahiso ea Filpass ea bandpass

Re hlophisitse boto ea PC e le hore e khone ho amohela filthara e fapaneng ea bandpass ho tlhahiso ea 11 RF ea IC1. Mofuta ona o entsoe ke Soshin Electronics Co mme o ngotsoe lebitso la GFWB3. Ke filthara ea 3 ea khatiso ea bandpass e nyane e 76 e sebelisang sehlopha sa maqhubu a 108-XNUMXMHz.

Monyetla oa ho sebelisa filthara ena ke hore e na le "rolloff" e ngata ka tlase le ka tlase ho sehlopha sa FM. Sena se baka tšitiso e fokolang ea lehlakoreng lehlakoreng ka linako tse ling. Drawback ke filthara ho thata haholo ho e fumana.

Ka ts'ebetso, sefahleho se nka sebaka sa 39pF capacitor, 'me lefatše le bohareng ba lefapha la konopo le hokahanyang ho PC board board. Ke ka lebaka leo ho nang le lesoba pakeng tsa 39pF capacitor lead. Li-capacitor tsa 39pF le 3.3pF le li-inductors tsa 68nH le 680nH ha li hlokahale, ha li-inductor tsa 68nH li nkeloa sebaka ke sehokelo sa terata.

Lintlha tsa potoloho

Tobetsa bakeng sa setšoantšo se seholoanyane

Setempe.5 (a): setšoantšo sena se bontša kamoo likarolo tse 'ne tsa bokaholimo ba beho ka lehlakoreng la boto ea PC. Etsa bonnete ba hore IC1 & VC1 e tataisoa hantle.

Shebella hona joale ho Fig.4 bakeng sa potoloho e felletseng ea Stereo FM Micromitter. Joalokaha ho lebelletsoe, IC1 e theha karolo ea mantlha ea potoloho ka likarolo tse ling tse kenyellelitsoeng ho phethela seteraele sa FM.

Matšoao a kenang a letsohong le letona le letona a kenella ka li-capacitor tsa 1μF ebe a sebelisoa ho lits'ebetso tsa attenuator tse nang le li-resistors tse 10kΩ tse tsitsitseng le li-trimpots tsa 10kΩ (VR1 & VR2). Ho tloha moo, lipontšo li kopantsoe le lipini tsa 1 & 22 tsa IC1 ka li-capacitors tsa electrolytic tsa 1μF.

Hlokomela hore li-capacitors tsa 1 bip tsa 1μF li kenyellelitsoe ho thibela phallo ea DC ea hona joale ka lebaka la liphokotso life kapa life tsa DC tse hlahisitsoeng ke mohloli oa tlhahiso. Ka mokhoa o ts'oanang, li-capacitors tsa 1μF tse lipapeng tsa 22 & 10 li bohlokoa ho thibela DC hajoale li-trimpots, hobane lipini tse peli tsa kenyelletso li khetholloa ka halofo ea phepelo. Terene ena ea phepelo e halofo e ntlafalitsoe e sebelisa 4μF capacitor holima 1 ea ICXNUMX.

Li-capacitors tsa 2.2nF tsa ho hatisa pele li maemong a 2 & 21, ha li-capacter tse 150pF tse litulong tsa 3 & 20 li beha ntlha ea roll-low filter. Boemo ba mokhanni a ka beoa ka capacitor ho pini ea 19 - leha ho le joalo, hangata sena ha se hlokahale kaha boemo ka kakaretso bo nepahetse ntle le ho eketsa capacitor.

Ebile, ho eketsa capacitor mona ho fokotsa feela karohano ea stereo hobane karolo ea molumo oa sefofane e fetotsoe ha e bapisoa le sekhahla sa 38kHz sa phapanyetsano.

Oscillator ea 7.6MHz e thehoa ka ho hokahanya kristale ea 7.6MHz lipakeng tsa 13 le 14. Ts'ebetsong, kristale ena e hokahane ka tsela e ts'oanang le sethala sa inverter se kahare. Kristale e beha frequency ea oscillation, ha li-capacitor tsa 27pF li fana ka taolo e nepahetseng.

Tobetsa bakeng sa setšoantšo se seholoanyane

Fig.5 (b): Tsela ea ho kenya likarolo ka holimo ho boto ea PC ho aha mofuta oa plukupack e tsamaisoa ka matla. Hlokomela hore IC1, VC1 le li-inductors tsa 68nH & 680nH ke lisebelisoa tsa holimo 'me li behiloe ka lehlakoreng la boto joalo ka ha ho bonts'itsoe ho Fig.5 (a)

The divider programmerable (kapa mohanyetsi oa lenaneo) e hlophisitsoe e sebelisoa ka li-switch swipping 15, 16, 17 & 18 (D0-D3). Lisebelisoa tsena hangata li ts'oaroa ka boholo ba li 10kΩ, ebe li huleloa tlase ha lits'ebeletso li koaloa. Lethathamo la 1 le bonts'a mokhoa oa ho fetoha ha li-switch ho khetha e le 'ngoe ea 14 mefuta e fapaneng ea phetiso.

RF oscillator e hlahisang e mocheng oa 9. Ena ke oscillator ea Colpitts 'me e hlophisitsoe ka inductor L1, 33pF & 22pF e kenyellelitsoeng li-capacitor le varicap diode VC1.

The capacitor e tsitsitseng ea 33pF e etsa mesebetsi e 'meli. Taba ea pele, e thibela voltage ea DC e sebelisitsoeng ho VC1 ho thibela hona joale ho kena ho L1. Ea bobeli, hobane e le ka tatellano le VC1, e fokotsa phello ea liphetoho matsohong a varicap, joalo ka "ho bonoa" ke phini ea 9.

Sena le sona se fokotsa molumo oa li-oscillator tsa RF ka lebaka la liphetoho tse etsahalang ho phallo ea matla a varicap mme e lumella taolo e lokolohileng ea senotlolo sa senotlolo.

Ka mokhoa o ts'oanang, capacitor ea 10pF e thibela ho phalla ha DC hona joale ka L1 ho tloha ho phofo ea 9. Phaello ea eona e tlase e boetse e bolela hore potoloho e hlophisitsoeng e kopantsoe feela 'me sena se lumella ntlha e phahameng ea Q bakeng sa potoloho e salletsoeng le ho qala habonolo ha oscillator.

Ho fetola oscillator

Tobetsa bakeng sa setšoantšo se seholoanyane

Fig.6: mona ke kamoo u ka fetolang boto ea mofuta oa betri. Ke taba feela ea ho tlohela D1, ZD1 & REG1 le ho kenya li-link tse 'maloa tsa terata.

Leqhubu la phumano e kopanyang le hlaha lenaneng la 5 mme le feptjoa ka 10μF capacitor ho trimpot VR3. Trimpot ena e beha botebo ba molumo. Ho tloha moo, lets'oao le kenyellelitsoeng le feptjoa ka "capacitor e 'ngoe ea 10μF le li-resistors tse peli tsa 10kΩ ho varicap diode VC1.

Joalokaha ho boletsoe pejana, ho tsoa ha phasewete loop control (PLL) ho pin 7 ho sebelisetsoa ho laola maqhubu a mojaro. Phumano ena e etsa hore theko e phahameng ea Darlington transistor Q1 'me sena se sebetsa, se sebelise motlakase ho VC1 ka mochini o hanyetsanang le li-3.3kΩ tse peli tse hanyetsanang.

Capacitor ea 2.2nF mothating oa li-resistors tse peli tsa 3.3kΩ e fana ka filthara e phahameng haholo.

Filter e eketsehileng e fanoa ke 100μF capacitor le 100Ω resistor e hokahaneng letotong pakeng tsa setsi sa Q1 le mokelli. Mohanyetsi oa 100Ω o lumella transistor ho araba liphetoho tse tsamaeang butle, athe capacitor ea 100μF e fana ka lifilimi tse tlase haholo. Morero o eketsehileng oa maqhubu a phahameng o fanoa ke 47nF capacitor e hokahaneng ka kotloloho pakeng tsa setsi sa Q1 le mokelli.

Morekisi oa 5.1kΩ o hokahantsoeng le seporo sa 5V o fana ka mojaro. Mohanyetsi enoa o hulanya mokelli oa Q1 ha transistor e felile.

Liphetho tsa FM

RF e hlahisoang e hlahisoa ho pini ea 11 mme e feptelloa ka filthara ea LC bandpass. Mosebetsi oa eona ke ho tlosa li-harmonics tse hlahisoang ke modulation le ho RF oscillator tlhahiso. Ha e le hantle, filthara e feta le makhetlo a mangata sehlopheng sa 88-108MHz empa e hula hangata maqhubu a ponts'o le ka tlase ho ena.

Filter e na le ts'ebetso e ts'oanang ea 75Ω 'me sena se lumellana le pato ea IC1 ka bobeli le potoloho e latelang ea "attenuator".

Li-resistors tse peli tsa 39Ω le mohanyetsi oa 56W shunt resistor ba theha moamoheli mme sena se fokotsa boemo ba matšoao ho antenna. Motseteli enoa oa hlokahala o lokela ho netefatsa hore transmitter e sebetsa moeling o lumelloang oa 10 ofW.

motlakase

Tobetsa bakeng sa setšoantšo se seholoanyane

Feiga.7: setšoantšo sena se bonts'a lintlha tsa phepelo ea koae ea L1. Ea pele e tla tlameha ho katoa hore e se ke ea feta 13mm ka holim'a boto. Sebelisa silicone sealant ho tšoara ea pele sebakeng, haeba ho hlokahala.

Matla a potoloho e tsoa ho plugack ea 9-16V DC kapa betri ea 6V.

Tabeng ea phepelo ea plukupack, motlakase o feptjoa ka switch switch S5 le diode D1 e fanang ka polokeho ea polarity e fapaneng. ZD1 e sireletsa potoloho khahlano le lithaelese tse phahameng tsa motlakase, athe molaoli REG1 o fana ka terene e tsitsitseng + 5V ho tsamaisa potoloho.

Ntle le moo, ts'ebetso ea betri, ZD1, D1 le REG1 ha e sebelisoe 'me likhokahano tsa D1 le REG1 li khutsufalitsoe. Phepelo e felletseng ea IC1 ke 7V, kahoo ts'ebetso ea betri ea 6V e loketse; mohlala 4 x AAA cell in a 4 x AAA Holder.

kaho

Boto ea PC e le 'ngoe e kentsoeng 06112021' me e lekanya feela 78 x 50mm e boloka likarolo tsohle tsa Micromitter. Sena se kentsoe ka mokotleng oa polasetiki o ka etsang 83 x 54 x 30mm.

Taba ea mantlha, hlahloba hore na boto ea PC e sebetsa hantle ka makhethe. Likhutšo li ka hloka ho etsoa hore li lekane holim 'a litšiea tsa sekhutlo tse lebokoseng. Ho etsa joalo, lekola hore masoba a li-socket tsa DC le li-socket tsa RCA ke boholo bo nepahetseng. Haeba ea L1 ea pele e se na setsi (bona ka tlase), e kenngoa ka ho e sutumetsa ka sekoting se ts'oereng hantle feela hore se e tšoarelle. Lekola hore lesoba lena le na le bophara bo nepahetseng.

Fig.5 (a) & Fig.5 (b) bontša kamoo likarolo li beoang ka teng boto ea PC. Mosebetsi oa pele ke ho kenya likarolo tse 'maloa ka lehlakoreng la koporo ea boto ea PC. Likarolo tsena li kenyelletsa IC1, VC1 le li-induct tse peli.

U tla hloka tšepe e hahelletsoeng ka tšepe, mabenyane, leseli le matla le khalase e holisang mosebetsing ona. Ka ho khetheha, ntlha ea tšepe e rekisoang e tla tlameha ho fetoloa ka ho e tlatsa hore e be sebopeho se tšesaane sa screwdriver.

Tobetsa bakeng sa setšoantšo se seholoanyane

Ho molemo ho kenya likarolo tse 'ne pele-pele (ho kenyeletsoa IC), pele o kenya likarolo tse setseng ka holim'a board ea PC. Hlokomela hore na 'mele oa kristale o robetse joang ho bapalami ba haufi ba 10kΩ (setšoantšo sa leqele).

IC1 le varicap diode (VC1) ke lisebelisoa tse khethiloeng, ka hona etsa bonnete ba hore li ba tataisa joalokaha ho bonts'itsoe holima sehokelo. Karolo e 'ngoe le e' ngoe e kentsoe ka ho e ts'oara ka li-tweezers ebe e rekisa lead e le 'ngoe (kapa pini) pele. Ha u etsa joalo, hlahloba hore na karolo e behiloe hantle pele u rekisa ka hloko (li) lisa.

Tabeng ea IC, ho molemo hore u qale ka ho nyenyefatsa litšila tsa eona pele e e beha ho boto ea PC. Ke taba feela ea ho futhumatsa lead e ngoe le e ngoe ka ntlha ea tšepe ea soldering sebakeng sa eona.

Etsa bonnete ba hore u sebelisa leseli le matla le khalase e holisang mosebetsing ona. Sena ha se na ho etsa hore mosebetsi o be bonolo empa hape se tla u lumella ho lekola khokahano e 'ngoe le e' ngoe kamoo e entsoeng. Ka ho khetheha, etsa bonnete ba hore ha ho na bokhutšoanyane pakeng tsa lipina tse haufi kapa lipini tsa IC.

Qetellong, sebelisa multimeter ea hau ho lekola hore na pini e 'ngoe le e' ngoe e hlile e hokahane le pina ea eona ho board ea PC.

Likarolo tse setseng kaofela li kentsoe ka lehlakoreng le holimo la boto ea PC ka tsela e tloaelehileng. Haeba u ntse u haha ​​mofuta oa matla oa plukupack, latela setšoantšo se fetang se bontšitsoeng ho setšoantšo sa feiga. Ntle le moo, bakeng sa mofuta oa betri o tsamaeang ka matla, tlohela ZD5 le socket ea DC ebe u kenya D1 & REG1 ka likhokahano tsa terata joalo ka ha ho bonts'itsoe ho Fig.1.

Kopano e holimo

Qala kopano e kaholimo ka ho kenya li-resistors le li-link tsa terata. Tafole ea 3 e bonts'a likhoutu tsa mmala oa hanyetsane empa re khothaletsa hape hore o sebelise multimeter ea digital ho lekola boleng. Hlokomela hore boholo ba bahanyetsi bo beiloe qetellong ho boloka sebaka.

Ha bahanyetsi ba se ba kene, kenya lits'ebetso tsa PC ho tlhahiso ea antenna le lintlha tsa tlhahlobo tsa TP GND le TP1. Sena se tla etsa hore ho be bonolo haholo ho hokahanya le lintlha tsena hamorao.

Ka mor'a moo, kenya li-trimpots VR1-VR3 le li-coCA tsa RCA tsa PC. Sokisi ea DC, diode D1 le ZD1 li ka kenngoa bakeng sa mofuta oa plukupack o tsamaeang ka matla.

Li-capacitor li ka tsamaea ka mor'a moo, li hlokomela ho kenya mefuta ea li-electrolytic ka polarity e nepahetseng. Mefuta ea elektroltiki ea NP (eo eseng ea polarized) kapa bipolar (BP) e ka kenngoa ka tsela efe kapa efe. Ba sututse ho theosa le mekotla ea bona e ntseng e hloa, e le hore ba se ke ba feta 13mm ka holim'a boto ea PC (sena ke ho lumella sekoaelo hore se lekane hantle ha libeteri tsa AAA li kentsoe tlasa boto ea PC ka har'a lebokose).

Li-capacitors tsa ceramic le tsona li ka kenngoa sethaleng sena. Lethathamo la 2 le bonts'a likhoutu tsa bona tsa ho tšoaea, ho etsa hore ho be bonolo hore u tsebe ho tseba melao.

kela L1

Feiga.7 e bonts'a lintlha tsa phefo bakeng sa coil L1. E na le lits'oants'o tse 2.5 tsa 0.5 - 1mm enamel e nang le enjene ea koporo (ECW) holim'a lekhoakhoa le kopantsoeng le neng le entsoe ka F29 ferrite slug. Ntle le moo, u ka sebelisa li-coil tsa mefuta e fapaneng tsa khoebo tse 2.5.

Mefuta e 'meli ea liforomo e teng - e' ngoe e na le motheo oa lipini tse 2 (e ka rekisoang ka kotloloho ho boto ea PC) le e tlang ntle le motheo. Haeba ea pele e na le motheo, e tla tlameha ho khutsufatsoa ke hoo e ka bang 2mm, e le hore bophahamo ba eona kaofela (ho kenyeletsa le setsi) ke 13mm. Sena se ka etsoa ka ho sebelisa hacksaw e ntle e nang le masela.

Seo se se entse, fokotsa coil, e felise lipheo ka kotloloho lipaketeng ebe se li rekisa. Hlokomela hore lintja li haufi le tse ling (ke hore, koae e haufi le leqeba).

Tobetsa bakeng sa setšoantšo se seholoanyane

Setšoantšo sena se bontša hore na molato o khangoa joang ho nka mekotla ea RCA, sokisi ea matla le lead ea antenna.

Ntle le moo, haeba ea pele e se na motheo, cheka molala ntlheng e le 'ngoe, joale u cheke sekoti ka har'a boto ea PC maemong a L1 e le hore ea pele e ka tiea. Ha u qetile, sutumelletsa ea eona ka sekoting sa eona, ebe o phepheletsa koili e le hore moea o tlase haholo o lutse ka holim'a boto.

Etsa bonnete ba hore o hlobolletsa ho kenella mohala ho terata ho fela pele ho rekisa ho isang ho boto ea PC. Li-dabs tse seng kae tsa silicone sealant li ka sebelisoa ho netefatsa hore coil ea pele e lula e le sebakeng.

Kamora nako, ferrite slug e ka kenngoa ho ea pele le e screw ka e le hore bokaholimo ba eona bo ka thulana le bokaholimo ba ea pele. Sebelisa sesebelisoa sa alignment sa polasetiki kapa sa koporo ho sokolisa ho slug - screwdriver e tloaelehileng e ka senya ferrite.

Hona joale Crystal X1 e ka kenngoa. Sena se tsitsisoa ke pele se koba ka litepisi tsa 90, e le hore e lule e otlolohile ho feta tse peli tse haufi le 10kΩ (bona foto). Kopano ea boto joale e ka phetheloa ka ho kenya switch ea DIP, transistor Q1, regulator (REG1) le lead ea antenna.

Antenna e mpa e le mofuta oa halofo ea maqhubu. E na le terata e bolelele ba 1.5m, 'me pheletso e le' ngoe e rekisoe moetlong oa antenna. Sena se lokela ho fana ka sephetho se setle ho isa molemong oa phetiso.

Ho lokisa nyeoe

Hona joale tlhokomelo e ka fetoloa ho polasetiki. Sena se hloka masoba pheletsong e le 'ngoe ho amohela liluloana tsa RCA, hammoho le masoba ka lehlakoreng le leng bakeng sa lead ea antenna le socket ea motlakase ea DC (haeba e sebelisoa).

Ntle le moo, lesoba le tlameha ho chekoa sekoahelo sa sesebelisoa sa motlakase.

Tobetsa bakeng sa setšoantšo se seholoanyane

Potoloho e ka tsamaisoa ho tsoa liseleng tse 4 x 1.5V AAA haeba u lakatsa ho etsa hore unit e be e nkehang. Hlokomela hore betri e nang le betri e hloka tokiso e itseng hore e lekane tsohle tse kahara nyeoe (sheba mongolo).

Ho hlokahala hape hore o tlose masapo a kahare a kahare maboteng a linyeoe ho ea botebo ba 15mm ka tlase ho lebokose le holimo la lebokose, e le hore a lekane boto ea PC. Re sebelisitse chisel e bohale ho tlosa tsena empa grrit e nyane e ka sebelisoa. Seo u se entseng, u boetse u hloka ho tlosa likhopo tse qetellong ea sekoaelo e le ho hlakola litlhoro tsa RCA le DC. Letlapa la kapele-pele le ka kenngoa sekoahelong.

Phetolelo e tsamaeang ka betri e na le mochini oa selefouno oa AAA o kentsoeng ka tlase ka lebokoseng, moo motheo oa eona o amanang le lehlakore la koporo la boto ea PC. Ho na le sebaka se lekaneng bakeng sa seqhoqho sena le boto ea PC hore e kenelle kahare ho linyeoe tse latelang:

(1). Likarolo tsohle ntle le sesebelisoa sa motlakase S5 ha lia lokela ho hlaha ka holimo ho boto ea PC ka tse fetang 13mm. Sena se bolela hore li-capacitor tsa motlakase li tlameha ho lula haufi le boto ea PC le hore L1 ea pele e tlameha ho khaoloa ka bolelele bo nepahetseng.

(2). Moholo oa sele oa AAA o ka bang 1mm o boima haholo 'me o lokela ho tlisoa qetellong, e le hore lisele li ka tsamaea hofihlella holim' a setsi.

(3). Bokaholimo ba liseketi tsa RCA le bona bo ka hloka ho kuta ka mokhoa o nyane, e le hore ho se be le lekhalo pakeng tsa lebokose le sekhahla kamora kopano.

Khokahano ea ACA

Morero oa "radio stereo" oa radio o lebelletsoe ho latela Leano la Lichelete la Radiocommunication Low Interaction Potential Devices (LIPD), joalo ka ha li fanoe ke Lekhotla la Khaso la Australia.

Haholo-holo, maqhubu a phetiso a tlameha ho ba kahare ho sehlopha sa 88-108MHz ho EIRP (Matla a lekanang a Isotropically Radiated Power) a 10mW mme ka modumo ea FM ha e kholo ho feta 180kHz bandwidth. Phatlalatso ha e ea lokela ho ba joalo ka seteishene sa seea-le-moea sa (kapa radio kapa sebui sa bafetoleli) se sebetsang ka har'a sebaka sa laesense.

Lintlha tse ling li ka fumaneha ho www.aca.gov.au websaete ea hau.

Tlhahisoleseling ea laesense ea sehlopha sa LIPD e ka jarollwa ho:
www.aca.gov.au/aca_home/legislation/radcomm/class_licences/lipd.htm

Teko le phetoho

Karolo ena ke seneke sa 'nete. Mosebetsi oa pele ke ho hokahanya L1 e le hore RF oscillator e sebetse ka holimo ho mefuta e nepahetseng. Ho etsa joalo, latela mokhoa ona oa mohato:

(1). Beha maqhubu a phetiso a sebelisa li-switch tsa DIP, joalo ka ha ho bontšitsoe Tafoleng ea 1. Hlokomela hore o hloka ho khetha maqhubu a sa sebelisoeng joalo ka setei sa khoebo sebakeng sa heno, ho seng joalo ho kenella ho tla ba bothata.

(2). Hokela khokahano ea hau ea multimeter e tloaelehileng ho TP GND le sephetho sa eona se nepahetseng sa ho koala 8 ea IC1. Khetha mofuta oa li-volts tsa DC ho metara, sebelisa matla ho Micromitter mme o hlahlobe hore o fumana ho bala ho haufi le 5V haeba o sebelisa plukupack ea DC.

Ntle le moo, limithara li lokela ho bonts'a volth ea betri haeba u sebelisa lisele tsa AAA.

(3). Tsamaisa multimeter e lebisang TP1 'me u fetole li-slug ho L1 bakeng sa ho bala hoo e ka bang 2V.

Tobetsa bakeng sa setšoantšo se seholoanyane

Mochini o sebelisang betri o lula ka tlase ho kesi, ka tlase ho boto ea PC.

Joale oscillator e se e hlophisitsoe hantle. Ha ho na liphetoho tse ling hape tsa L1 tse lokelang ho hlokoa haeba ka mor'a nako o fetohela ho frequency e ngoe kahare ho sehlopha se khethiloeng. Leha ho le joalo, haeba u fetohela khafetsa ho sehlopha se seng, L1 e tla tlameha ho fetoloa hore e baloe 2V ho TP1.

Ho beha lipolao

Setšoantšo sa.8.: setšoantšo se setle sa setšoantšo se ka pele.

Se setseng hona joale ke ho fetola li-trimpots VR1-VR3 ho beha boemo ba matšoao le botebo ba molumo. Mohato ka mohato ke o latelang:

(1). Beha VR1, VR2 & VR3 libakeng tsa bona tsa bohareng. VR1 le VR2 li ka fetoloa ka ho fetisetsa screwdriver litsing tsa mekotla ea RCA μ, ha VR3 e ka fetoloa ka ho tsamaisa capacitor ea μF ka pele ho eona lehlakoreng le leng.

(2). Tšepa molumo oa radio ea Stereo FM kapa seea-le-moea ho maqhubu a transmitter. Motataisi oa FM le transmitter qalong o lokela ho beoa ka limithara tse peli ka thoko.

(3). Hokela mohloli oa lets'oao la stereo (mohlala, sebapali sa CD) ho tsebiso ea RCA 'me u hlahlobe hore na sena se amoheloa ke tuner kapa seea-le-moea.

Feiga.9: mohlala o felletseng oa polasetiki ea PC.

(4). Fetola anticlockwise ea VR3 ho fihlela sesupo sa "stereo" se fihla ho moamoheli, ebe u lokisa VR3 hang-hang sebakeng sena ka 1/8 ka nako e le ngoe.

(5). Fetola VR1 le VR2 bakeng sa molumo o motle ho fetisisa ho tloha tuner - o tla tlameha ho tlohela mohloli oa pontšo ka nakoana ho etsa phetoho e ngoe le e ngoe. Ho tlameha ho ba le lets'oao le lekaneng la ho “tlosa” lerata lefe kapa lefe la semelo empa ntle le tšitiso e lemohileng.

Ela hloko ka ho khetheha hore VR1 le VR2 e lokela ho beoa boemong bo le bong, ho boloka moeli oa mocha oa leqele le o nepahetseng.

Ke eona - Microitter ea hau e ncha ea Stereo FM e ikemiselitse ho nka bohato.

Lethathamo la 2: Likhoutu tsa Capacitor
latela boleng ba Khoutu ea IEC Khoutu ea 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
Lethathamo la 3: Likhoutu tsa Mebala ea Resistor
No. latela boleng ba Khoutu ea 4-Band (1%) Khoutu ea 5-Band (1%)
1 22kÎ © 'mala o mofubelu o mofubelu 'mala o mofubelu o mofubelu o sootho
8 10kÎ © mmala o sootho o sootho sootho e sootho e sootho e sootho
1 5.1kÎ © botala bo bosootho bo botšo botala bo bosootho bo sootho sootho sootho
2 3.3kÎ © 'mala o moputsoa oa lamunu e sootho lamunu e sootho e sootho sootho
1 100Ω sootho sootho sootho sootho sootho e sootho e sootho e sootho
1 56Ω botala bo botala bo bosootho bo sootho botala bo botala bo bosootho bo loileng bo loileng
2 39Ω 'mala o mosoeu o sootho 'mala o moputsoa oa lamunu e khubelu
likarolo List

Boto ea 1 ea PC, khoutu 06112021, 78 x 50mm.
Lebokose le 1 la lisebelisoa tsa polasetiki, 83 x 54 x 31mm
Letlapa le 1 la kapele, 79 x 49mm
1 7.6MHz kapa 7.68MHz kristale
Sesebelisoa sa subminiature sa 1DDT (Jaycar ST-0300, Altronics S 1415 kapa equiv.) (S5)
Likoloe tse 2 tsa PC-Mount RCA (switched) (Altronics P 0209, Jaycar PS 0279)
1 2.5mm PC-Mount DC socket ea matla
1 4-way switch ea DIP
1 2.5 Turnar coil (L1) e fapaneng
1 4mm F29 ferrite Slug
1 680nH (0.68μH) holim'a Mount inductor (nyeoe ea 1210A) (Farnell 608-282 kapa e ts'oanang)
1 68nH bokaholimo ba sefahleho sa inductor (nyeoe ea 0603) (Farnell 323-7886 kapa e tšoanang)
Bolelele ba 1 100mm ea terata ea koporo ea 1mm
Bolelele ba 1 50mm ba terata ea koporo ea 0.8mm
Bolelele ba 1m ka terata ea hook
Likarolo tse 3 tsa PC
1 4 x AAA ea tšoereng sele (e hlokahalang bakeng sa ts'ebetso ea betri)
Lisele tse 4 tsa AAA (li hlokahala bakeng sa ts'ebetso ea betri)
Li-trimpots tse 3kΩ tse otlolohileng (VR10-VR1)

Semiconductors

1 BH1417F Rohm holimo-leetong la li-stereo tsa FM radio (IC1)
1 78L05 molaoli oa matla a tlase (REG1)
1 MPSA13 Darlington transistor (Q1)
1 ZMV833ATA kapa MV2109 (VC1)
1 24V 1mon zener diode (ZD1)
1 1N914, 1N4148 diode (dolarar.traetelo.com d1)

Baqapelli

2 100μF 16VW PC elektrone
5 10μF 25VW PC elektrone
2 1μF bipolar elektrone
2 1μF 16VW elektrone
1 47nF (.047μF) poltter ea MKT
2 10nF (.01μF) ceramic
3 2.2nF (.0022μF) poltter ea 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

Bahlaseli (0.25W, 1%)

1 22kÎ © 1 100Î ©
8 10kÎ © 1 56Î ©
1 5.1kÎ © 2 39Î ©
2 3.3kÎ ©

songolo
Meetso ea phetisetso 87.7MHz ho 88.9MHz ka mehato ea 0.2MHz
106.7MHz ho isa ho 107.9MHz ka mehato ea 0.2MHz (14 kakaretso)
Karolo e Feletseng ea Harmonic (THD) hangata 0.1%
Ho hatella pele hangata 50ms
Filter e tlase 15kHz / 20dB / lilemo tse leshome
Ho arohana ha seteishene hangata 40dB
Tekanyo ea seteiti kahare? 2dB (e ka fetoloa le li-trimpots)
Pilot modular 15%
Matla a RF Output (EIRP) ka tloaelo 10μW ha u sebelisa mofofisi oa inbuilt
Lisebelisoa tsa phepelo 4-6V
Phepelo ea hajoale 28mA ho 5V
Boemo ba ho kenya molumo 220mV RMS e phahameng ho 400Hz le 1dB compression limited
U ka reka lihlahisoa tse boletsoeng sehloohong sena mona:

ST0300: SUB-MINI TOGGLE SPDT SOLDER TAG E FELILE

Likotlo tse latelang li fumaneha ka sengoloa sena: