What role can the oscillator play in the circuit?
One of the most common oscillators is the clock's pendulum. If you push the pendulum to start swinging, it will oscillate at some frequency - it will swing back and forth a certain number of times per second. The main control frequency is the length of the pendulum.
To make an object oscillate, energy must switch back and forth between the two forms. For example, in a pendulum, energy is converted between potential and kinetic energy. When the pendulum is at one end of the swing, its energy is all potential energy and is ready to fall. When the pendulum is in the middle of the cycle, 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 kinetic energy is turned into potential energy. The conversion of energy between the two forms is the cause of oscillation.
Eventually, any physical oscillation stops because of 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 each time it strikes a bell to compensate for the energy lost by friction.
Oscillators are electronic components used to generate repetitive electronic signals (usually sine waves or square waves). The circuit it consists of is called an oscillating circuit.
The low-frequency oscillator refers to an oscillator that generates an AC signal with a frequency of 0.1 Hz to 10 Hz. This word is usually used in audio synthesis to distinguish other audio oscillators.
Oscillators can be mainly divided into two types: harmonic oscillators and relaxation oscillators.
According to the oscillating excitation mode, it can be divided into self-oscillation oscillator and he-excitation oscillator
According to the circuit structure can be divided into RC oscillator, inductor and capacitor oscillator, crystal oscillator, tuning fork oscillator;
According to the output waveform can be divided into sine wave, square wave, sawtooth wave oscillator.
Self-oscillating multivibrators are also called astable circuits. Each of the collectors of the two tubes has a capacitor connected to the base of the other tube, which acts as an AC coupling 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. At that time, the collector of the conduction tube has an output, and the capacitance of the collector couples the pulse signal to the base of the other tube to make the other tube conduct. At this time, the original tube turned off. In this way, the two tubes turn on and off, and an oscillating current is generated.
Because the device cannot have the same parameters, the state of the two triodes changes at the moment of power-up. This change is due to the increasingly strong role of positive feedback, leading to a temporary steady state. During the temporary steady state, another triode is turned on or off after the capacitor is gradually charged, and the state is turned over to reach another temporary state. This creates oscillations.
Oscillator is a frequency source and is generally used in phase-locked loops. It is a device that can convert DC power into AC power without external signal excitation. It has many uses. Electromagnetic waves are generated in radio broadcasting and communication equipment. A clock signal is generated in the microcomputer. Generate high-frequency alternating current in the voltage regulator circuit.
Basic components of the oscillator1, triode amplifier (from the role of energy control)
2, positive feedback network; (feedback part of the output signal to the input)
3, frequency selection network; (to select the desired oscillation frequency, so that the oscillator can oscillate at a single frequency, so as to obtain the required waveform self-excited multivibrator is also called astable circuit. Oscillator two-tube Each of the collectors has a capacitor connected to the base of another tube, which acts as an AC coupling 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 cut off. At this moment, the oscillation occurs. The collector of the conduction tube of the conduction tube has an output, and the capacitance of the collector will be coupled to the base of the other tube so as to conduct the other tube, at this time, the original conduction tube is cut off. As of the end, there is an oscillating current.
Since the device cannot have the same parameters, the state at the moment of power-up changes, and this change in the oscillator is more and more intense due to the positive feedback, leading to a transient state. During the temporary steady state, another triode is turned on or off after the capacitor is gradually charged, and the state is turned over to reach another temporary state. This creates oscillations.
The low-frequency oscillator is an oscillator that generates an ac signal with a frequency between 0.1 Hz and 10 Hz. This word is usually used in audio synthesis to distinguish other audio oscillators.
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