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For any discrete capacitor, there is a frequency above DC at which it ceases to behave as a pure capacitor. This frequency, where is as high as , is called the self-resonant frequency. The self-resonant frequency is the lowest frequency at which the impedance passes through a minimum.
DC blocks are coaxial components that prevent the flow of audio and direct current (DC) frequencies while offering minimum interference to RF signals. There are three basic forms of DC blocks. There are three basic forms of DC blocks.
If, though, the output is taken across the resistor, high frequencies are passed and low frequencies are attenuated (since the capacitor blocks the signal as its frequency approaches 0). In this configuration, the circuit behaves as a high-pass filter. The range of frequencies that the filter passes is called its bandwidth.
For a power supply line, a bypass capacitor from the supply voltage line to the power supply return (neutral) would be used. High frequencies and transient currents can flow through a capacitor to circuit ground instead of to the harder path of the decoupled circuit, but DC cannot go through the capacitor and continues to the decoupled circuit.
A filter that blocks signals with a particular range of frequencies. bandwidth The range of frequencies over which a system generates or uses significant signal power. bang-bang control A controller that switches a final element on or off instead of providing a proportional response. Barlow's wheel A demonstration of electromagnetic principles.
A device incorporated in the capacitor connecting the terminals of the unit, capable of reducing the residual voltage effectively to zero after the capacitor has been disconnected from the supply. internal (element) fuse A device incorporated in the capacitor which disconnects an element or a group of elements in the event of breakdown.
A capacitor can also act as an AC resistor. aluminium electrolytic capacitors in particular are often used as decoupling capacitors to filter or bypass undesired AC frequencies to ground or for capacitive coupling of audio AC signals. Then the dielectric is used only for blocking DC.
Capacitors used for suppressing undesirable frequencies are sometimes called filter capacitors. They are common in electrical and electronic equipment, and cover a number of applications, such as: Glitch removal on direct current (DC) power rails; Radio frequency interference (RFI) removal for signal or power lines entering or leaving equipment
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