They are not suitable for use as extremely low-frequency oscillators because the inductors and capacitors would be large in size, heavy, and costly to manufacture.
The lowest frequency of an LC low-pass filter is zero, i.e. DC.
Phase-shift oscillator Armstrong oscillator Cross-coupled LC oscillator RC oscillator
For a series a.c. circuit, resonance occurs when the inductive reactance is equal to the capacitive reactance. You can work out the frequency at which this occurs by inserting the variables into the following equation:XL = XC
A local oscillator is used in a superheterodyne radio circuit for example.The incoming radio frequency is mixed with an internal local oscillator circuit to generate a new intermediate frequency (IF) .The local oscillator usually runs at a frequency of 470kHz and is generated by an inductor and capacitor(LC oscillator)
A: actually any active components will oscillate with positive feedback A transistor can be used as an amplifier along with an LC tank circuit to form an oscillator; it is an active device (as LIBURNO states) which will amplify the feedback signal coming out of the LC tank circuit. The tank circuit has a natural resonant frequency, meaning the L and C together will try to generate a specific frequency; this is then fed back into the input of the transistor amplifier, and the output is fed to the LC tank circuit exacerbating this oscillation until it reaches its' maximum level. An inverting amplifier can be used similarly; the output is fed to the input; this will cause the output to change as fast as the amplifier can. The frequency of this design is much harder to control, but potentially higher. Also, without the LC tank, the output voltage will remain lower.
Another type of sine-wave generator uses inductors and capacitors for its frequency-determining network. This type is known as the LC OSCILLATOR. LC oscillators, which use tank circuits, are commonly used for the higher radio frequencies. They are not suitable for use as extremely low-frequency oscillators because the inductors and capacitors would be large in size, heavy, and costly to manufacture.
Because an RC oscillator is affected by stray capacitance in the active components in the circuit. HF oscillators use an LC tuned circuit to define the frequency.
The lowest frequency of an LC low-pass filter is zero, i.e. DC.
Four types of LC oscillators include voltage controlled oscillators, drift control oscillators, crystal oscillators, and tuned circuit oscillators. A tuned circuit oscillator is the most common type of oscillator.
Phase-shift oscillator Armstrong oscillator Cross-coupled LC oscillator RC oscillator
difference between local oscillator and controlled oscillator
The suffix LC typically stands for "low carbon" and is commonly used to refer to materials containing a low percentage of carbon.
depends on the oscillator and its purpose
LC are connected in parallel combination to short out signals too high or too low in frequency from getting to the load.FYI:Series LC circuits give minimum impedance at resonance, while parallel LC (“tank”) circuits give maximum impedance at their resonant frequency.The LC circuit behaves as an electronic resonator, which are the key component in many applications. Oscillators Mixers Graphics tablets Filters Electronic article surveillance & TunersFor example: a capacitor/inductor oscillator acts as the tuner for the radio.The sine wave that matches that particular frequency will get amplified by the resonator, and all of the other frequencies will be ignored. In a radio, either the capacitor or the inductor in the resonator is adjustable. This is how you "tune in" different stations on the radio :)In a nutshell: A series resonant circuit provides voltage magnification and a parallel resonant circuit provides current magnification.
What do you mean by the term LC and when it is used
For a series a.c. circuit, resonance occurs when the inductive reactance is equal to the capacitive reactance. You can work out the frequency at which this occurs by inserting the variables into the following equation:XL = XC
The difference between an RC and LC is that the frequency - determining device in the RC oscillator is not a tank circuit. LC can operate with A or C biasing, while RC can only operate with A.