Nzira iri nyore uye isinganyanyi kushanda yekuona ruzha inowanikwa nekuisa maikorofoni muchipfuva. Iyi nzira inotambura nekukanganiswa neruzha rwekunze uye yakadonha kubva mukufarirwa. Imwe nzira, inoshandiswa muWelch-Allyn's Meditron smartphone stethoscope, inosanganisira kuiswa kwe piezoelectric kristaro kumusoro kwesimbi shaft, pasi pe shaft ichiita kusangana nediaphragm. 3M inoshandisawo piezoelectric foam yakaiswa kuseri kweiyo gobvu rabha-yakafanana nekristaro.
vakakundikana