Coupling: A capacitor used in a coupling circuit is called a coupling capacitor. These capacitors are widely utilized in resistance-capacitance (RC) coupled amplifiers and other capacitor-coupled circuits, where they serve to block DC signals while allowing AC signals to pass through.
Filtering: A capacitor used in a filtering circuit is called a filter capacitor. These capacitors are employed in power supply filtering and various other filter circuits; a filter capacitor functions to remove signals within a specific frequency band from a composite signal.
Decoupling: A capacitor used in a decoupling circuit is called a decoupling capacitor. These capacitors are utilized in the DC power supply lines of multi-stage amplifiers to eliminate harmful low-frequency coupling between the individual amplifier stages.
High-Frequency Oscillation Suppression: A capacitor used in a high-frequency oscillation suppression circuit is called a suppression capacitor. In audio negative-feedback amplifiers, this type of capacitor is employed to suppress potential high-frequency self-oscillation, thereby eliminating high-pitched squealing or feedback noise that might otherwise occur in the amplifier.
Resonance: A capacitor used in an LC resonant circuit is called a resonant capacitor. These capacitors are essential components in both parallel and series LC resonant circuits.
Bypassing: A capacitor used in a bypass circuit is called a bypass capacitor. When a circuit requires the removal of signals within a specific frequency band, a bypass capacitor circuit can be utilized. Depending on the frequency of the signals being bypassed, these circuits are categorized into full-spectrum bypass circuits (bypassing all AC signals) and high-frequency bypass circuits.
Neutralization: A capacitor used in a neutralization circuit is called a neutralizing capacitor. These capacitors are employed in the high-frequency (HF) and intermediate-frequency (IF) amplifier stages of radio receivers, as well as in the HF amplifiers of television sets, to prevent self-oscillation.
Timing: A capacitor used in a timing circuit is called a timing capacitor. These capacitors are utilized in circuits where time control is achieved through the charging and discharging of a capacitor; the capacitor serves to determine the magnitude of the circuit's time constant.
Integration: A capacitor used in an integrating circuit is called an integrating capacitor. In the synchronization separation circuits of field-scan systems (such as those found in video displays), this type of capacitor is used to extract the vertical synchronization signal from the composite synchronization signal.
Differentiation: A capacitor used in a differentiating circuit is called a differentiating capacitor. In trigger circuits, to generate sharp-peaked trigger signals, a differentiating capacitor circuit is employed to derive these sharp pulses from various types of input signals (primarily rectangular pulses).
Compensation: Capacitors utilized in compensation circuits are referred to as compensation capacitors. In the bass compensation circuits of cassette decks, this type of low-frequency compensation circuit is used to boost the low-frequency components within the audio playback signal; conversely, high-frequency compensation circuits are also utilized for high-frequency signals.
Bootstrapping: Capacitors used in bootstrapping circuits are known as bootstrap capacitors. The output stages of common OTL (Output Transformerless) power amplifiers utilize this type of bootstrap circuit to slightly boost the amplitude of the positive half-cycle of the signal through positive feedback.
Crossover: Capacitors found in crossover circuits are termed crossover capacitors. In the loudspeaker crossover networks of audio systems, these circuits are employed to ensure that high-frequency drivers operate within the high-frequency band, mid-range drivers operate within the mid-frequency band, and low-frequency drivers operate within the low-frequency band.
Load Capacitance: This refers to the effective external capacitance that, in conjunction with a quartz crystal resonator, determines the load resonance frequency. Common standard values for load capacitance include 16 pF, 20 pF, 30 pF, 50 pF, and 100 pF. The load capacitance can be appropriately adjusted based on specific requirements; through such adjustments, the operating frequency of the resonator can typically be tuned to its nominal value.