Oscillator

The oscillator is used to generate repetitive electronic signal ( usually a sine wave or square wave ) electronic components. It forms a circuit called oscillation circuit. To convert a direct current into an AC signal with a frequency output of the electronic circuit or device. Many species, according to the oscillation modes can be divided into a self-excited oscillator, he excited oscillator; the circuit structure can be divided into capacitance resistance oscillator, inductance and capacitance oscillator, crystal oscillator, fork oscillator; the output waveform can be divided into sine wave, square wave, sawtooth wave oscillator. Widely used in the electronics industry, medical treatment, scientific research and so on.

Brief introduction

The oscillator is a device for converting energy -- to convert direct current electrical energy to a certain frequency AC power. It forms a circuit called oscillation circuit.

Low frequency oscillator ( low-frequency oscillator, or LFO ) is generated at a frequency of 0.1 Hz to 10 Hz AC signals between the oscillator. This word is often used in audio synthesis, to distinguish them from other audio oscillator.

Oscillator [1 ] can be mainly divided into two kinds: harmonic oscillator ( harmonic oscillator ) and relaxation oscillator ( relaxation oscillator ). To convert a direct current into an AC signal with a frequency output of the electronic circuit or device. Many species, according to the oscillation modes can be divided into a self-excited oscillator, he excited oscillator; the circuit structure can be divided into capacitance resistance oscillator, inductance and capacitance oscillator, crystal oscillator, fork oscillator; the output waveform can be divided into sine wave, square wave, sawtooth wave oscillator. Widely used in the electronics industry, medical treatment, scientific research and so on. Mainly applicable to various institutions, medical, chemical, health and epidemic prevention, environmental monitoring and scientific research departments for biological, biochemical, cell, bacteria and other liquid, solid state compounds of oscillating culture.

Self excitation multivibrator is also called the astable circuit. Two of the collector has a capacitance are respectively connected with other pipe base, the exchange coupling effect, creating a positive feedback circuit, when the power is switched on the moment, a pipe to pass, another tube cutoff, then, conducting tube collector set output, the collector of the capacitor will pulse signal is coupled to another pipe base to another pipe communicated. When the original conducting tube cutoff. This turns two tube turn-on and turn-off, produces a shock current.

The device can not be same parameter, so the electric moment two three transistor state changes, the changes due to positive feedback effect is more and more intense, lead to a transient. The transient period of another three transistor via a capacitor charging conduction or cutoff gradually after, state of flip, to reach another metastable. Such go round and begin again to form oscillation.

Sine wave oscillator

Can output sine wave oscillator called sine wave oscillator.

Sine wave oscillator are mainly LC oscillator RC oscillator two.

The most basic part of oscillator

1 three transistor amplifier; ( energy control function )

The positive feedback network ( 2; the feedback of the output signal to the input end of a part )

3 frequency selective network; ( used to select desired oscillation frequency, in order to make the oscillator to oscillate at a single frequency, so as to obtain the required wave vibration

Oscillator definition

The oscillator is simply a frequency source, generally used in a phase locked loop. Detail is not a required signal excitation, oneself can be DC power into AC power device. Generally divided into positive feedback and negative resistance two. The so-called" oscillation", its meaning is implied, oscillator includes an oscillation to the oscillation never process and function. Can be completed from the DC power to AC power conversion, such a device can be called" oscillator".