To oscillate an object, energy must be converted back and forth between the two forms. For example, in a pendulum, energy is converted between potential energy and kinetic energy. When the pendulum is at the end of the swing, its energy is all potential energy and is ready to fall. When the pendulum is in the middle of the loop, all potential energy is converted to kinetic energy and the pendulum moves at the fastest speed. When the pendulum moves to the other side, all the kinetic energy turns into potential energy. The conversion of energy between these two forms is the cause of the oscillation.
Finally, any physical oscillations will stop due to friction. To continue exercising, you must add a little energy to each cycle. In the pendulum clock, the energy that keeps the pendulum moving comes from the spring. The pendulum gets a little thrust every time it rings to compensate for the energy lost by friction.
The role that the oscillator can play in the circuit
An oscillator is an electronic component used to generate a repeating electrical signal (usually a sine or square wave). The circuit that constitutes it is called an oscillating circuit.
A low frequency oscillator is an oscillator that generates an alternating current signal at a frequency between 0.1 Hz and 10 Hz. This term is often used in audio synthesis to distinguish other audio oscillators.
The oscillators can be divided into two main types: harmonic oscillators and relaxation oscillators.
According to the oscillation excitation mode, it can be divided into a self-excited oscillator and a stimulator;
According to the circuit structure, it can be divided into a RC oscillator, an inductor-capacitor oscillator, a crystal oscillator, a tuning fork oscillator, etc.
According to the output waveform, it can be divided into oscillators such as sine wave, square wave and sawtooth wave.
Self-excited multivibrators are also called unsteady circuits. Each of the collectors of the two tubes has a capacitor connected to the base of the other tube to perform an AC coupling function to form a positive feedback circuit. When the power is turned on, one of the tubes is turned on first and the other tube is turned off. The collector of the conducting tube has an output, and the capacitance of the collector couples the pulse signal to the base of the other tube to conduct the other tube. At this time, the originally turned-off pipe is cut off. Thus, the two tubes are turned on and off in turn, and an oscillating current is generated.
Photosensitive oscillator circuit
Since the parameters of the device are not completely identical, the state of the two transistors changes at the moment of power-on. This change is caused by the positive feedback, which leads to a transient steady state. During the transient steady state, the other transistor is turned on or off after being gradually charged by the capacitor, and the state is reversed to reach another temporary steady state. This cycle begins to oscillate.
The oscillator is a frequency source and is typically used in phase-locked loops. It is a device that can convert DC power into AC energy without external signal excitation. It has many uses. Electromagnetic waves are generated in radio broadcast and communication equipment. A clock signal is generated in the microcomputer. High frequency alternating current is generated in the voltage stabilizing circuit.
Basic component of the oscillator
1, triode amplifier; (from the energy control role)
2. Positive feedback network; (feed back part of the output signal to the input)
3. Frequency selection network; (to select the required oscillation frequency, so that the oscillator can oscillate at a single frequency, thereby obtaining the required waveform self-excited multivibrator also called an unsteady circuit. Each of the collectors has a capacitor connected to the base of the other tube to form an AC coupling function, forming a positive feedback circuit. When the power is turned on, one of the tubes is turned on first, and the other tube is turned off. At this time, the oscillation is performed. The collector of the conduction tube has an output, and the capacitance of the collector is coupled to the base of the other tube to turn on the other tube. At this time, the originally turned-off tube is turned off, so that the two tubes are turned on and At the cutoff, an oscillating current is generated.
Since the parameters of the device are not completely identical, the state at the moment of power-on has changed. The change of the oscillator is more and more intense due to the positive feedback, resulting in a transient steady state. During the transient steady state, the other transistor is turned on or off after being gradually charged by the capacitor, and the state is reversed to reach another temporary steady state. This cycle begins to oscillate.
A low frequency oscillator is an oscillator that generates an alternating current signal between 0.1 Hz and 10 Hz. This term is often used in audio synthesis to distinguish other audio oscillators.
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