振荡器是一种能自动地将直流电源能量转换为一定波形的交变振荡信号能量的转换电路。与放大器的区别：无需外加激励信号，就能产生具有一定频率、波形和振幅的交流信号。由晶体管等有源器件和具有某种选频能力的无源网络组成。-Oscillator is a DC power supply capable of automatically waveform energy into a certain alternating oscillation signal energy conversion circuit. The difference amplifier: no external excitation signal, AC signal can be generated with a certain frequency, waveform and amplitude. By active devices such as transistors and passive network with some frequency selection capability of components.