顾名思义，晶体管常用作混频器，可以输出混频信号，并且是许多电子通讯系统的基本元件。
As the name suggests, mixers produce output signals with mixed frequencies and are fundamental components of many electronic communications systems.
该公司的研究人员应用的原理是，当可见光照到光电二极管时可以产生电信号(在数码相机中研发了该项技术)。
Its researchers used photodiodes (the technology found in digital cameras) that generate an electrical signal when light strikes them.
起初它被发明出来用于无线电信号的放大，这让你能够用晶体管收音机取代真空管收音机。
It was first developed to amplify radio signals, and you had transistor radios that replaced the vacuum tubes that were being used.
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