Keeb kwm kev loj hlob ntawm cov thev naus laus zis suab tuaj yeem muab faib ua plaub theem: raj, transistor, integrated circuit thiab field effect transistor.

Xyoo 1906, Asmeskas de Forrest tau tsim lub tshuab nqus tsev transistor, uas yog thawj coj hauv kev siv tshuab electro-acoustic tib neeg. Bell Labs tau tsim xyoo 1927. Tom qab thev naus laus zis tawm tswv yim tsis zoo, kev txhim kho thev naus laus zis suab tau nkag mus rau lub sijhawm tshiab, xws li Williamson amplifier tau siv thev naus laus zis tawm tswv yim tsis zoo los txo qhov kev cuam tshuam ntawm lub amplifier mus rau xyoo 1950, kev txhim kho ntawm lub raj amplifier tau mus txog ib lub sijhawm zoo siab tshaj plaws, ntau yam raj amplifiers tshwm sim tsis kawg. Vim tias lub suab xim ntawm lub raj amplifier yog qab zib thiab puag ncig, nws tseem nyiam los ntawm cov neeg nyiam.

Xyoo 1960, kev tshwm sim ntawm transistors ua rau cov neeg nyiam suab nrov coob heev nkag mus rau hauv lub ntiaj teb suab nrov dav dua. Transistor amplifiers muaj cov yam ntxwv ntawm lub suab nrov thiab txav mus los, kev cuam tshuam tsawg, kev teb zaus dav thiab ntau yam dynamic.

Thaum xyoo 1960s thaum ntxov, Tebchaws Meskas tau tshaj tawm thawj zaug txog cov integrated circuits, uas yog cov tswv cuab tshiab ntawm thev naus laus zis suab. Thaum xyoo 1970s thaum ntxov, cov integrated circuits tau maj mam lees paub los ntawm kev lag luam suab vim lawv qhov zoo, tus nqi qis, ntim me me, ntau yam haujlwm thiab lwm yam. Txog rau tam sim no, cov thick film audio integrated circuits thiab operational amplifier integrated circuits tau siv dav hauv cov audio circuits.

Nyob rau nruab nrab xyoo 1970, Nyiv Pooj tau tsim thawj lub raj xa hluav taws xob teb. Vim tias lub raj xa hluav taws xob teb muaj cov yam ntxwv ntawm lub raj xa hluav taws xob ntshiab, xim tuab thiab qab zib, thiab ntau yam dynamic ntawm 90 dB, THD <0.01% (100KHZ), nws sai sai no tau nrov hauv suab. Hauv ntau lub amplifiers niaj hnub no, cov transistors teb tau siv ua qhov tso zis kawg.

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