An oscillator circuit that can be triggered at any time

Crystal oscillator

Quartz Oscillator 3225 20M OSC

An oscillator is an electronic component used to generate repeated electronic signals (usually sine or square waves). The circuit that constitutes it is called an oscillating circuit. An electronic circuit or device capable of converting direct current into an output of an alternating current signal having a certain frequency.
According to the oscillation excitation mode, it can be divided into self-excited oscillator and other excitation oscillator; according to the circuit structure, it can be divided into RC oscillator, inductor-capacitor oscillator, crystal oscillator, tuning fork oscillator, etc.; according to the output waveform, it can be divided into sine waves. , square wave, sawtooth wave and other oscillators.