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Capacitors Technology

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A capacitor is a passive two-terminal electrical component that stores electrical energy in an electric field. The effect of a capacitor is known as capacitance.

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About electric capacity
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William Reeve

Electric capacity is made up by the two metal pole and insulating media in the middle.

Due to the different insulation materials, the composition of capacitors is also different:

According to the structure, it can be divided into fixed capacitors, variable capacitors and fine-tuning capacitors.


According to the media, it can be divided into: gas dielectric capacitors, liquid dielectric capacitors, inorganic solid dielectric capacitors, organic solid capacitors capacitance electrolytic capacitors.

According to the polarity, it can be divided into: a polar capacitor and non-polar capacitor.


According to the role of the capacitor in the circuit:
• Coupling capacitance (for direct current AC)
• Filtering capacitor (removing a certain frequency band signal from a total signal )
• Decoupling capacitors (eliminating harmful low-frequency interconnections between amplifiers)
• High-frequency vibration-canceling capacitor (eliminating the possibile high-frequency whistle of the amplifier)
• Resonant capacitor (used in LC resonant circuit)
• Bypass capacitor (removing a band of signal from signal)
• Neutralize capacitor (to eliminate self-excitation in high-frequency amplifier)
• Timing capacitance (acting as the control time constant)
• Integral capacitance (take field sync signal from line field composite sync signal)
• Differential capacitance (spike trigger signal from all types of signals)
• Bootstrap capacitor (improve the positive half cycle amplitude of signal)


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Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

Daniel Gilbert

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