coupling capacitor การใช้

• Coupling capacitors can also introduce nonlinear distortion at low frequencies.
• A coupling capacitor is used to connect the transmitters and receivers to the high voltage line.
• Hence, a line trap unit is inserted between the busbar and connection of coupling capacitor to the line.
• Figure 2A shows an example of Figure 1 where the impedance coupling the input to the output is the coupling capacitor " C C ".
• Because capacitors pass AC signals but block DC, film capacitors with their high insulation resistance and low self-inductance are well-suited as signal coupling capacitors for higher frequencies.
• Low frequency oscillations like motorboating indicate that some device or circuit with a large time constant is involved, such as the interstage coupling capacitors or transformers, or the filter capacitors and supply transformer winding.
• A coupling capacitor's ability to prevent a DC load from interfering with an AC source is particularly useful in Class A amplifier circuits by preventing a 0 volt input being passed to a transistor with additional resistor biasing; creating continuous amplification.
• L serves as the load . ( The load is irrelevant to this discussion : it just provides a path for the current to leave the circuit . ) In Figure 2A, the coupling capacitor delivers a current j? " C"
• Instead, DC voltage in the output section is blocked by an " output coupling capacitor "-typically a large-value ( 3000-6000?F ) electrolytic capacitor-which is interposed between the amplifier's output section and the loudspeaker.
• The coupling capacitor is replaced on the input side of the circuit by the Miller capacitance " C M ", which draws the same current from the driver as the coupling capacitor in Figure 2A . Therefore, the driver sees exactly the same loading in both circuits.
• The coupling capacitor is replaced on the input side of the circuit by the Miller capacitance " C M ", which draws the same current from the driver as the coupling capacitor in Figure 2A . Therefore, the driver sees exactly the same loading in both circuits.
• Each coupling capacitor along with the input electrical impedance of the next stage forms a high-pass filter and the sequence of filters results in a cumulative filter with a  " 3reactance of each is at most a tenth of the input impedance of each stage, at the lowest frequency of interest.
• The large capacitance per unit volume of electrolytic capacitors make them valuable in relatively high-current and low-frequency electrical circuits, e . g . in power supply filters for decoupling unwanted AC components from DC power connections or as coupling capacitors in audio amplifiers, for passing or bypassing low-frequency signals and storing large amounts of energy.