Preamplifier (preamp) ndi yamagetsi amplifier zomwe zimakonzekera chizindikiro chaching'ono chamagetsi kuti chiwonjezere kapena kukonzedwa.
A preamplifier nthawi zambiri amayikidwa pafupi ndi sensa kuti achepetse zotsatira za phokoso ndi kusokoneza. Amagwiritsidwa ntchito kulimbikitsa mphamvu ya siginecha kuyendetsa chingwe kupita ku chida chachikulu popanda kusokoneza kwambiri chiŵerengero cha signal-to-noise (SNR).
Phokoso la phokoso la preamplifier ndilofunika kwambiri; malinga ndi chilinganizo cha Friis, pamene a phindu ya preamplifier ndi yokwera, SNR ya chizindikiro chomaliza imatsimikiziridwa ndi SNR ya siginecha yolowera ndi chithunzi cha phokoso cha preamplifier.
Mu makina omvera apanyumba, mawu oti 'preamplifier' nthawi zina atha kugwiritsidwa ntchito kutanthauza zida zomwe zimangosintha pakati pa mizere yosiyana ndikugwiritsa ntchito kuwongolera mawu, kuti pasakhale kukulitsa kwenikweni.
Mu makina omvera, chokulitsa chachiwiri chimakhala chokulitsa mphamvu (mphamvu amp). The preamplifier imapereka mphamvu yamagetsi (mwachitsanzo kuchokera pa 10 millivolts kufika 1 volt) koma palibe phindu lalikulu lamakono.
Magetsi amplifier amapereka mphamvu yapamwamba yofunikira kuyendetsa zokuzira mawu.
Ma preamplifiers atha kukhala: ophatikizidwa mnyumba kapena chassis ya amplifier yomwe amadyetsa m'nyumba ina yomwe imayikidwa mkati kapena pafupi ndi gwero lazizindikiro, monga chosinthira, maikolofoni kapena chida choimbira.
Mitundu Yopangira Zoyambira: Mitundu itatu yoyambira yoyambira ilipo: chowongolera chomwe chimakhudzidwa ndipano, chowongolera cha parasitic-capacitance, ndi chowongolera chomwe chimakhudzidwa ndi charge-sensitive preamplifier.
Ndine Joost Nusselder, woyambitsa Neaera komanso wotsatsa malonda, abambo, ndipo ndimakonda kuyesa zida zatsopano ndi gitala pamtima pa zomwe ndimakonda, ndipo pamodzi ndi gulu langa, ndakhala ndikupanga zolemba zakuya zamabulogu kuyambira 2020. kuthandiza owerenga okhulupirika ndi maupangiri ojambulira ndi gitala.
