Momwe Mungapangire Wailesi Yokhala ndi Luso Losintha Manja
Wailesi ingamveke ngati ukadaulo "wachikale", koma ndicho chifukwa chake chokongola. Ngakhale kuti ndi yosavuta, wailesi ndi chipangizo chamagetsi chomwe chimaphatikiza malingaliro a mafunde amagetsi, kumveka bwino, kukulitsa ma signal, ndi kusankha ma frequency. Kupanga wailesi yanu—makamaka yokhala ndi luso lokonza manual—ndi ntchito yosangalatsa komanso yophunzitsa. Ndi kukonza manual, mutha kutembenuza batani kuti mupeze siteshoni, kumva chisangalalo "chogwira" wailesi, ndikumvetsetsa momwe ma frequency amasankhidwira popanda thandizo la kusanthula kokha.
Nkhaniyi ikufotokoza mfundo, zigawo, ndi njira zodziwika bwino zopangira wailesi yosavuta yokhala ndi kusintha kwa manja. Tikuyang'ana kwambiri zolandirira wailesi za AM (Amplitude Modulation) chifukwa ndizosavuta kupanga komanso zoyenera oyamba kumene.
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1. Mvetsetsani Mfundo Yogwirira Ntchito Yokonza Mawayilesi Pamanja
Wailesi imagwira ntchito zitatu zazikulu:
1. Jambulani zizindikiro za wailesi pogwiritsa ntchito antenna.
2. Kusankha ma frequency enaake kuchokera ku zizindikiro zambiri zomwe zikubwera (iyi ndi ntchito yokonza).
3. Amasintha chizindikiro kukhala mawu ndikuchikulitsa kuti chimveke pa ma speaker kapena mahedifoni.
Pokonza wailesi ndi manja, kusankha ma frequency kumachitika pogwiritsa ntchito LC resonant circuit—kuphatikiza inductor (L) ndi capacitor (C). Mukatembenuza chogwirira chosinthira, mumasintha mtengo wa capacitor (nthawi zambiri variable capacitor), motero mumasintha ma frequency a resonant.
Fomula ya mafupipafupi a resonance:
\[
f = \frac{1}{2\pi \sqrt{LC}}
\]
Ndiko kuti, mukasintha C, mumasintha f, ndipo wailesi imasankha siteshoni yomwe ma frequency ake amafanana.
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2. Sankhani mtundu wa wailesi yoti ipangidwe
Pali njira zingapo zopangira:
– Wailesi ya kristalo (yopanda batire): yosavuta, koma phokoso lake ndi lofooka ndipo limafuna antenna yayitali.
- Wailesi yosavuta ya AM yokhala ndi amplifier yamawu: ikadali yosavuta koma phokoso lake ndi lamphamvu chifukwa limagwiritsa ntchito amplifier.
– Superheterodyne: yabwino kwambiri, koma yovuta kwambiri kwa oyamba kumene.
Pa pulojekiti iyi ya mawu 1000, chisankho chabwino ndi wailesi ya AM yokhala ndi kukonza kwamanja ndi chowonjezera mawu. Kusinthaku kumamveka ngati "kwamanja" ndipo zotsatira zake zimamveka bwino kudzera m'ma speaker ang'onoang'ono.
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3. Zigawo Zofunikira
Nayi mndandanda wa zinthu zomwe zimagwiritsidwa ntchito nthawi zambiri:
Gawo lokonza ndi kulandira zizindikiro
- Variable capacitor (variable capacitor) pafupifupi 10–365 pF (yofala mu ma radio a AM)
– Chotulutsira/chokolera. Chidebe:
– koyilo yokonzeka kugwiritsidwa ntchito (koyilo ya antenna ya AM ferrite), kapena
- pangani yanu ndi waya wopangidwa ndi enamel pa ndodo ya ferrite
– Detector diode (monga 1N34A germanium; kapena 1N60, kapena Schottky monga BAT43)
- Ma capacitor ang'onoang'ono osefera (monga 10 nF–100 nF)
- Zotsutsa zamitundu yosiyanasiyana (monga 10k–100k) kutengera ndi chithunzicho
Gawo la mawu (amplifier)
– Chojambulira mawu chosavuta cha IC, mwachitsanzo:
– LM386 (yodziwika kwambiri pa mapulojekiti ang'onoang'ono a wailesi)
- 10k voliyumu potentiometer
- Wokamba nkhani waung'ono wa 8 ohm kapena earphone
- Ma capacitor a electrolytic olumikizira (monga 10 µF, 100 µF)
– Gwero la mphamvu ya batri la 9V kapena 3–6V (kutengera kapangidwe kake)
Zipangizo zosonkhanitsira
- Breadboard kapena PCB yokhala ndi mabowo
- Solder ndi tin (ngati chomaliza)
- Zingwe zolumikizira
- Chogwirira chokonzera (chosankha koma chimapangitsa kuti chiwoneke bwino)
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4. Kupanga Gawo Losinthira (LC) la Kusankha Ma Frequency
Gawo lofunika kwambiri pakukonza ndi manja ndi dera la thanki la LC. Njira yosavuta:
1. Gwiritsani ntchito capacitor yosinthika ngati C.
2. Ikani koyilo (L) yoyenera gulu la AM (pafupifupi 530–1600 kHz).
Njira 1: Kugwiritsa ntchito koyilo ya AM ferrite antenna yopangidwa kale
Ma wailesi ambiri akale a AM ali ndi ma coil pa ferrite rods. Mutha kugwiritsa ntchito izi chifukwa ndizoyenera mtundu wa AM ndipo ndizosavuta kuzisintha ndi variable capacitor.
Njira yachiwiri: Pangani koyilo yanu (pafupifupi)
– Konzani ndodo ya ferrite (ikhoza kukhala kuchokera ku wailesi yogwiritsidwa ntchito).
– Gwiritsani ntchito waya wa enamel wa 0,2–0,5 mm.
– Mphepo imazungulira pafupifupi 60–100 (imasiyana malinga ndi ferrite ndi capacitor).
- Pangani kukhudza (nthambi) ngati mukufuna kuyesa kugwiritsa ntchito mphamvu.
Popeza zigawo zenizeni zimasiyana, nthawi zambiri muyenera kuyesa manambala angapo ozungulira mpaka mtundu wa tuning ukhale woyenera.
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5. Gawo Lowunikira: Kusintha Zizindikiro za RF kukhala Audio
Chizindikiro cha AM chomwe chajambulidwa chikadali mafunde amphamvu kwambiri. Kuti chisinthe kukhala mawu, chipangizo chowunikira ma envelopu chimagwiritsidwa ntchito:
- Chotuluka cha LC circuit chimapita ku diode.
- Diode imakonza chizindikirocho kuti "chophimba" cha mawu chichotsedwe.
- Kachipangizo kakang'ono kamene kamathandiza kupangitsa kuti chizindikiro cha RF chikhale chosalala kotero kuti chomwe chimatsala ndi gawo la mawu.
Ma diode a germanium nthawi zambiri amasankhidwa chifukwa ali ndi mphamvu yochepa yoyendetsera magetsi, zomwe zimapangitsa kuti azimva bwino zizindikiro zofooka. Ma diode a Schottky angakhalenso njira ina yabwino.
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6. Onjezani Chowonjezera Ma Audio (LM386) cha Strong Sound
Popanda amplifier, mawu a chipangizocho amakhala chete (monga wailesi ya kristalo). Chifukwa chake, onjezani amplifier yosavuta ya mawu monga LM386.
Ndondomeko yonse:
– Cholowera cha LM386 chimalandira chizindikiro cha mawu kuchokera ku chowunikira kudzera mu capacitor yolumikizira (monga 10 nF–100 nF kapena 1 µF kutengera zofunikira).
- 10k potentiometer imagwira ntchito ngati voliyumu.
– Chotulutsa cha LM386 kupita ku sipika chimadutsa mu capacitor ya electrolytic (nthawi zambiri 220 µF kapena 470 µF).
- Onjezani capacitor ya bypass (monga 100 nF) pafupi ndi pini yamagetsi kuti muchepetse phokoso.
Mwanjira imeneyi, wailesi idzamveka bwino pamasipika ang'onoang'ono, makamaka ngati malo olumikizirana mawu a AM m'dera lanu ali amphamvu mokwanira.
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7. Njira Zoyenera Kupangira Makonzedwe
Kuti zikhale zosavuta komanso zosakhumudwitsa, chitani izi pang'onopang'ono:
Gawo 1: Konzani kaye zida zowunikira + zowunikira
- Ikani LC (coil + variable capacitor).
- Lumikizani diode ndi filter capacitor.
- Yesani kumvetsera mawu otuluka ndi mahedifoni okhala ndi impedance yayikulu (ngati muli nayo) kapena gwiritsani ntchito amplifier yosavuta.
Cholinga chake ndikuwonetsetsa kuti mutha "kumvetsera" wailesiyo mukayisintha.
Gawo 2: Onjezani amplifier ya LM386
- Konzani LM386 pa bolodi lopangira mkate.
- Yatsani batri.
- Lumikizani mawu ochokera ku chowunikira ku cholowera cha LM386.
- Ikani sipika ndi potentiometer ya voliyumu.
Gawo 3: Konzani dongosolo
Ma wailesi amamva phokoso ndi malo a chingwe. Malangizo:
- Pangani chingwe chomwe chili mu gawo la LC kukhala chachifupi momwe mungathere.
- Sungani zida za RF (LC, ma diode) kutali ndi zingwe zotulutsira mawu zomwe zimanyamula mafunde amphamvu.
- Ikani capacitor ya bypass pamagetsi pafupi ndi IC.
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8. Malangizo Okonza Manja Kuti Muzitha Kuona Masiteshoni Mosavuta
1. Gwiritsani ntchito antenna yabwino
Kwa AM, antenna ya ferrite ndi yokwanira, koma nthawi zina antenna ya waya ya mamita angapo imathandiza m'malo ofooka a chizindikiro.
2. Sinthani kusintha pang'onopang'ono
AM ili ndi njira yopapatiza m'malo ena. Muitembenuze pang'onopang'ono pamene mukusintha voliyumu.
3. Chepetsani zinthu zomwe zimayambitsa kusokoneza
Ma charger otsika mtengo, magetsi ena a LED, ndi ma laptops onse angayambitse phokoso. Yesetsani kusunga wailesi kutali ndi zinthu zomwe zingasokoneze.
4. Gwiritsani ntchito njira yosavuta
Nthawi zina kulumikiza malo ozungulira ndi chitoliro chachikulu cha madzi/chitsulo kungathandize kulandira (samalani ndipo onetsetsani kuti chili chotetezeka).
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9. Kupita Patsogolo
Wailesi ikayamba kugwira ntchito, mutha kuikulitsa:
- Onjezani choyimbira chosinthira chokhala ndi sikelo yamafupipafupi.
- Pangani chivundikiro pogwiritsa ntchito acrylic, matabwa, kapena 3D printing.
- Yesani gulu lina (monga FM), koma mukufuna njira yovuta kwambiri.
- Onjezani gawo la RF amplifier musanayambe chowunikira kuti chikhale chosavuta kumva.
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Kutseka
Kupanga wailesi yokhala ndi luso lokonza mawayilesi ndi njira yosangalatsa yomvetsetsa zoyambira za kulumikizana kwa wailesi. Pulojekitiyi imakuphunzitsani za ma LC resonance circuits, kuzindikira kwa AM pogwiritsa ntchito ma diode, ndi kukulitsa mawu pogwiritsa ntchito ma IC osavuta monga LM386. Kupatula kupereka zotsatira zooneka—wayilesi yomwe imalandira mauthenga—mudzamvetsetsanso momwe ukadaulo wa wailesi umagwirira ntchito kuyambira masiku ake oyambirira mpaka lero.
Ngati mukufuna, ndingakuthandizeni ndi dongosolo la circuit schematic yeniyeni, malangizo a kuchuluka kwa ma coil turns kutengera variable capacitor yomwe muli nayo, kapena breadboard/PCB layout guide kuti mupeze zotsatira zokhazikika komanso phokoso lochepa.
