电子学从二十世纪初开始,发展到八十年代,只用了几十年的时间.五十年代以前,电子学所用的主要元件是电子管.它的体积大,耗电多,寿命短.五十年代以后,发明了半导体晶体管,它可以代替电子管,用于电子学的各个领域中. 起初的晶体管电路是用许多分立的元件组成的,例如晶体管、电容器、电感等,一起焊接到一块印刷电路板上,它的体积比用 Electronics began in the early 20th century and developed into the 1980s. It took only a few decades. Before the 1950s, the main component used in electronics was the electron tube. It was bulky, power-hungry, and short-lived. After the fifties, a semiconductor transistor was invented, which could replace the electron tube in various fields of electronics. The original transistor circuit was composed of many discrete components, such as transistors, capacitors, inductors, etc., welded together to a piece of printing On the circuit board, its volume ratio