A Pay Phone

Kwa zaka zambiri, ngati simunali kunyumba ndipo mukufuna kuyimba foni, mafoni olipira anali njira yanu yokhayo. Ngakhale pano ambiri aife tili ndi mafoni m'matumba, mafoni olipira sakupita kulikonse. FCC imalimbikitsa kukhala nawo m'malo ena pofuna chitetezo cha anthu (monga kunja kwa polisi, komwe mungafunike kuyimbira foni mutamangidwa). Mafoni olipira amatha kulumikiza mafoni, kuyika mitengo, ndikusonkhanitsa malipiro molondola pogwiritsa ntchito magetsi okha omwe amatengedwa pa foni. Amakhalanso osawona zipolopolo, opangidwa kuti athe kupirira mitundu yonse ya kuwononga ndi kuba.

M’zaka za m’ma 1980, makampani amafoni omwe anali ndi mafoni a m’dzikolo ankafuna kuti mafoni azigwira magetsi akamagwiritsidwa ntchito. Chingwe cham'manja chikachotsedwa pachikutocho, chowongoleracho chimatulutsa ndikuyambitsa chosinthira cholumikizira. Izi zimalola kuti foni iyambe kujambula mphamvu, kupangitsa wogwiritsa ntchito kuyimba—chizindikiro chakuti foniyo yakonzeka kugwiritsidwa ntchito. Pakuyimba, ma 48 volts amagetsi operekedwa ndi mizere ya foni amawongolera ma elekitirodi onse a foni, kuphatikiza, movutikira, wowongolera wamkulu ndi chophimba cha LCD. Foni ili ndi batire ya NiCd yongochatsidwanso yomwe imagwiritsidwa ntchito ndi cholinga chimodzi chokha: cholumikizira cha m'manja chikalowetsedwa m'malo oyambira, foni iyenera kubanki ndalama zomwe wayimbirayo kapena kubwezera ndalama kwa woyimbirayo. Kuyimba kulikonse kumalipira batire yokwanira kuti igwire ntchitoyi.