Buku Lotsogolera Kupanga Wailesi ya AM kwa Oyamba
Pendauluan
Wailesi ya AM (Amplitude Modulation) yakhala imodzi mwa njira zakale kwambiri zolumikizirana ndipo yakhala ikugwiritsidwa ntchito kwambiri kuyambira kumayambiriro kwa zaka za m'ma 20. Ngakhale kuti tsopano tili ndi ukadaulo wapamwamba kwambiri monga FM, digito, ndi wailesi ya satellite, wailesi ya AM ikadali ndi chidwi chapadera, makamaka kwa anthu omwe amakonda kugwiritsa ntchito zamagetsi. Kupanga wailesi yanu ya AM kungakhale pulojekiti yophunzitsa komanso yosangalatsa kwa oyamba kumene. Nkhaniyi ifotokoza njira zoyambira zopangira wailesi yosavuta ya AM kuyambira pachiyambi.
Mfundo Zoyambira za AM Radio
Wailesi ya AM imagwira ntchito posintha kutalika kwa chizindikiro chonyamulira kuti chigwirizane ndi chizindikiro cha mawu. Njirayi imaphatikizapo zigawo zingapo zofunika:
1. Antena: Imalandira zizindikiro za wailesi.
2. Chosinthira: Sankhani ma frequency enieni omwe mukufuna kumvetsera.
3. Chowunikira: Chimachotsa chizindikiro cha mawu kuchokera ku chizindikiro chonyamulira.
4. Amplifier: Imalimbitsa chizindikiro cha mawu kuti chimveke kudzera m'ma speaker kapena mahedifoni.
Zida ndi Zipangizo Zofunikira
Musanayambe, onetsetsani kuti muli ndi zida ndi zipangizo zotsatirazi:
1. Antena: Mungagwiritse ntchito waya wautali pafupifupi mamita 10.
2. Chosinthira: Chosinthira mphamvu ya capacitor ndi coil, mutha kupanga yanu kapena kugula seti.
3. Chowunikira: Germanium diode (monga 1N34A).
4. Amplifier: Mahedifoni kapena ma speaker, ndi ma transistors ndi ma resistors ena ngati mukufuna kupanga amplifier yosavuta.
5. Breadboard kapena PCB: Kusonkhanitsa zinthu.
6. Solder ndi Tin: Ngati mwasankha kusonkhanitsa zigawo pa PCB.
7. Multimeter: Kuyesa kulumikizana ndi mtengo wa zigawo.
Kupanga Antena
Gawo loyamba ndi kupanga kapena kukhazikitsa antenna. Chingwe cha mamita 10 kutalika chingagwiritsidwe ntchito kunja kwa nyumba kapena chipinda kuti zizindikiro zilandire bwino. Antena iyi idzalumikizidwa ku chotulutsira mawu cha wailesi.
Kupanga Chosinthira (Oscillator & Variable Capacitor)
Chotulutsira mawu ndi chinthu chofunikira chomwe chimakupatsani mwayi wosankha ma frequency enaake. Umu ndi momwe mungapangire chotulutsira mawu chosavuta:
1. Koyilo kapena Chotulutsira: Pangani koyilo pogwiritsa ntchito waya wamkuwa wozungulira enamel pafupifupi maulendo 20-25 kuzungulira chubu cha pulasitiki cha mainchesi 1.
2. Variable Capacitor: Izi zitha kupezeka mu ma radio akale kapena kugula. Variable capacitor iyi imakulolani kusintha capacitance kuti musankhe ma frequency osiyanasiyana.
Dulani Yotulutsira Zinthu
Lumikizani mbali imodzi ya coil ku terminal imodzi ya variable capacitor. Lumikizani mbali ina ya coil pansi. Lumikizani terminal ina ya variable capacitor pansi. Kulumikizana kumeneku kuyenera kulumikizidwa ku antenna.
Kupanga Chowunikira
Zipangizo zozindikira zimagwiritsidwa ntchito kulekanitsa zizindikiro za mawu ndi zizindikiro zonyamulira. Ma germanium diode ndi zigawo zabwino kwambiri pa izi chifukwa zimafuna mphamvu zochepa zoyatsira. Umu ndi momwe mungapangire chowunikira:
Detector Circuit
1. Lumikizani mbali imodzi ya diode mpaka pomwe coil ndi variable capacitor zalumikizidwa.
2. Lumikizani mbali ina ya diode pansi kudzera mu resistor ya pafupifupi 10kΩ ndi capacitor yofanana ya 0.01µF.
Chizindikiro chomwe chimakonzedwa ndi dera ili ndi chizindikiro cha mawu chomwe chili chokonzeka kukulitsidwa.
Kupanga Amplifier Yosavuta
Kuti timve bwino mawu, ayenera kukulitsidwa. Apa, tipanga amplifier yosavuta pogwiritsa ntchito ma transistors.
Zigawo za Amplifier
1. Transistor ya NPN monga 2N3904.
2. Zotsutsa: 10kΩ ndi 1kΩ.
3. Capacitor: 100µF yolumikizira.
4. Mahedifoni kapena ma speaker ang'onoang'ono.
Dera Lokulitsa Mphamvu
1. Lumikizani mphamvu ya chowunikira (malo omwe ali pakati pa diode ndi chotsutsa) kumunsi kwa transistor kudzera mu chotsutsa cha 10kΩ.
2. Lumikizani chotulutsira transistor pansi.
3. Lumikizani chosonkhanitsira cha transistor ku terminal imodzi ya mahedifoni kudzera mu resistor ya 1kΩ.
4. Lumikizani cholumikizira china cha mahedifoni pansi.
5. Ikani capacitor ya 100µF pakati pa chowunikira ndi maziko a transistor kuti mutseke mphamvu ya DC.
Kuyika Zonse Pamodzi
Zigawo zonse zazikulu zikakonzeka, mutha kuyamba kulumikiza dera pa bolodi kapena PCB. Nazi njira:
1. Lumikizani Antena: Lumikizani antena ku coil yotulutsira.
2. Ikani Chojambulira: Lumikizani chojambuliracho ku chosinthira mphamvu cha capacitor ndikuchilumikiza pansi.
3. Lumikizani Chojambulira ku Chojambulira: Lumikizani chotulutsa cha chojambuliracho ndi cholowera cha chojambuliracho.
4. Lumikizani Chotulutsira Chojambulira ku Amplifier: Lumikizani chotulutsira chojambulira ku amplifier pogwiritsa ntchito coupling capacitor.
5. Lumikizani Amplifier ku Mahedifoni: Onetsetsani kuti kulumikizana kuli kolondola ndipo ikani choletsa emitter malinga ndi chithunzicho.
Kulinganiza ndi Kusintha
Chigawo chikakonzedwa, gawo lotsatira ndikukonza chotulutsira mawu kuti chilandire ma wailesi. Tembenuzani chosinthira cha capacitor pang'onopang'ono mukumvetsera kudzera m'mahedifoni kuti mupeze chizindikiro chomveka bwino. Zingatenge kusintha pang'ono pa coil ndi antenna kuti mupeze kulandira bwino kwambiri.
Kuyesa ndi Kuthetsa Mavuto
Ngati palibe phokoso lomwe lamveka, malangizo otsatirawa angathandize kuthetsa mavuto:
1. Yang'anani Malumikizidwe: Onetsetsani kuti malumikizidwe onse ndi olondola komanso olimba.
2. Yesani Voltage: Gwiritsani ntchito multimeter kuti muwonetsetse kuti pali voltage yolondola mu gawo lililonse la dera.
3. Chongani Zigawo: Onetsetsani kuti ma diode, ma transistors, ndi ma capacitor akugwira ntchito bwino.
4. Kusintha kwa Antena: Nthawi zina malo kapena kutalika kwa antena kumafunika kusinthidwa.
Kutseka
Kupanga wailesi yosavuta ya AM ndi ntchito yokhutiritsa komanso yophunzitsa. Mwaphunzira mfundo zoyambira za kusintha kwa amplitude, ntchito ya zigawo mu wailesi yolandila, komanso momwe mungazisanjire mu dongosolo logwira ntchito. Pitirizani kuyesa zigawo ndi makonzedwe osiyanasiyana kuti muwongolere kulandira ndi kumveka bwino. Zabwino zonse, ndipo zabwino zonse!
Mwa kumvetsetsa ndi kuyesa izi, mwatenga sitepe yoyamba kuti mukhale waluso kwambiri pa zamagetsi ndi mauthenga a wailesi. Kuyesa kosangalatsa, ndipo zabwino zonse!
