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Electronics Glossery: F

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Fader

The control that adjusts the relative volume levels of front and rear speakers in a four speaker system or the front and rear pre-amplifier outputs.
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Source:http://www.the12volt.com/glossary/glossary.asp
fall time

Time it takes the falling edge of a pulse to go from 90% of peak voltage to 10% of peak voltage.
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Source:http://www.twysted-pair.com/dictionary.htm
Farad

The basic unit of capacitance. A capacitor has a value of one farad when it can store one coulomb of charge with one volt across it.
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Source:http://www.the12volt.com/glossary/glossary.asp

feedback

A portion of the output signal of an amplifier which is connected back to the input of the same amplifier.
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Source:http://www.twysted-pair.com/dictionary.htm
feedback amplifier

An amplifier with an external signal path from its output back to its input.
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Source:http://www.twysted-pair.com/dictionary.htm
ferrite

A powdered, compressed and sintered magnetic material having high resistivity. The high resistance makes eddy current losses low at high frequencies.
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Source:http://www.twysted-pair.com/dictionary.htm
ferrite bead

Ferrite composition in the form of a bead. Running a wire through the bead increases the inductance of the wire.
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Source:http://www.twysted-pair.com/dictionary.htm
ferrite-core inductor

An inductor wound on a ferrite core.
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Source:http://www.twysted-pair.com/dictionary.htm
ferrites

Compound composed of iron oxide, a metallic oxide and ceramic. The metal oxides include zinc, nickel, cobalt or iron.
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Source:http://www.twysted-pair.com/dictionary.htm
ferrous

Composed of and or containing iron. A ferrous metal exhibits magnetic characteristics as opposed to non-ferrous material.
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Source:http://www.twysted-pair.com/dictionary.htm

fiber optics

Laser's light output carries information that is conveyed between two points by thin glass optical fibers.
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Source:http://www.twysted-pair.com/dictionary.htm
Fidelity

The term used to describe the accuracy of recording, reproduction, or general quality of audio processing.
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Source:http://www.the12volt.com/glossary/glossary.asp
field effect transistor -(FET)

A voltage controlled transistor in which the source to drain conduction is controlled by gate to source voltage.
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Source:http://www.twysted-pair.com/dictionary.htm
filament

Thin thread of carbon or tungsten which produces heat or light with the passage of current.
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Source:http://www.twysted-pair.com/dictionary.htm
Filter

An active or passive circuit or device designed to block a certain frequency or range of frequencies.
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Source:http://www.the12volt.com/glossary/glossary.asp


Flat Frequency Response

Term for a circuit or audio system which will pass audio signals that will vary by no more than 1 dB usually between 20 Hz and 20 kHz unless otherwise specified.
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Source:http://www.the12volt.com/glossary/glossary.asp
Fletcher Munson Curves

The set of curves showing the human's ear's frequency sensitivity versus loudness, created by researchers Fletcher and Munson. The curves show the ear to be most sensitive to sounds between 3 kHz and 4 kHz (ear canal resonances).
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Source:http://www.the12volt.com/glossary/glossary.asp
flip flop

A bistable multivibrator. A circuit which has two output states and is switched from one to the other by means of an external signal (trigger).
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Source:http://www.twysted-pair.com/dictionary.htm
Floating Ground

Non-common grounding point.
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Source:http://www.the12volt.com/glossary/glossary.asp
floating ground

Conmmon connection in a circuit that provides a return path for current but is not connected to an earth ground.
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Source:http://www.twysted-pair.com/dictionary.htm
flow soldering

Flow or wave soldering technique in large scale electronic assembly to solder all the connections on a printed circuit board by moving the board over a wave of molten solder.
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Source:http://www.twysted-pair.com/dictionary.htm
flux

1) In magnetism, the magnetic field consisting of lines of force.
2) Material used to remove oxide films from the surface of metals in preparation for soldering.
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Source:http://www.twysted-pair.com/dictionary.htm
flux density

The concentration of magnetic lines of force. Determines strength of the magnetic field.
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Source:http://www.twysted-pair.com/dictionary.htm
flywheel effect

Sustaining effect of oscillation in an LC circuit.
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Source:http://www.twysted-pair.com/dictionary.htm

FM Stereo Separation

The FM tuner demodulator's ability to separate left and right channel signals of FM stereo broadcast. Measured in decibels, the higher the number the better.
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Source:http://www.the12volt.com/glossary/glossary.asp

Focus Lens

The lens in the optical block of a compact disc player which focuses the laser light onto the surface of the disc.
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Source:http://www.the12volt.com/glossary/glossary.asp
Focus Servo

The circuit which keeps the laser light correctly focused on the pit area of the disc.
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Source:http://www.the12volt.com/glossary/glossary.asp
forward bias

A PN junction bias which allows current to flow through the junction. Forward bias decreases the resistance of the depletion layer.
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Source:http://www.twysted-pair.com/dictionary.htm

free electrons

Electrons that are not in any orbit around a nucleus.
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Source:http://www.twysted-pair.com/dictionary.htm
free runing multivibrator

A multivibrator that produces a continuous output waveform without any signal input. A square wave generator used to produce a clock signal.
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Source:http://www.twysted-pair.com/dictionary.htm
frequency

Rate of recurrence of a periodic wave. Measured in Hertz (cycles per second).
The number of wavelengths which pass a specific point in a specific time period, measured in Hertz (Hz). Cycles per second.
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Source:http://www.twysted-pair.com/dictionary.htm
Source:http://www.the12volt.com/glossary/glossary.asp
Frequency Dividing Network

See crossover network.
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Source:http://www.the12volt.com/glossary/glossary.asp
frequency meter

Meter used to measure frequency of periodic waves.
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Source:http://www.twysted-pair.com/dictionary.htm
Frequency Modulation (FM)

The encoding of a carrier wave by variation of it's frequency in accordance with an input signal.
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Source:http://www.the12volt.com/glossary/glossary.asp
frequency multiplier

A harmonic conversion circuit in which the frequency of the output signal is an exact multiple of the input frequency.
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Source:http://www.twysted-pair.com/dictionary.htm
Frequency Response

General: Indication of how well a circuit responds to different frequencies applied to it.
Audio: The lowest and highest parts of the frequency spectrum that can be reproduced by an audio component within specific limits and tolerances.
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Source:http://www.the12volt.com/glossary/glossary.asp
Source:http://www.twysted-pair.com/dictionary.htm
frequency response curve

A graph of amplitude over frequency indicating a circuit response to different frequencies.
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Source:http://www.twysted-pair.com/dictionary.htm
frequency-division multiplex -(FDM)

Transmission of two or more signals over a common path by using a different frequency band for each signal.
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Source:http://www.twysted-pair.com/dictionary.htm
frequency-domain analysis

A method of representing a waveform by plotting its amplitude against frequency.
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Source:http://www.twysted-pair.com/dictionary.htm



full scale deflection -(FDS)

Deflection of a meter's pointer to the farthest position on the scale.
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-twysted-
full wave rectifier

Rectifier that makes use of the full AC wave in both the positive and negative half cycles.
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Source:http://www.twysted-pair.com/dictionary.htm
function generator

Signal generator that can produce sine, square, triangle and sawtooth output waveforms.
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Source:http://www.twysted-pair.com/dictionary.htm
fundamental frequency

Lowest frequency in a complex waveform.
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Source:http://www.twysted-pair.com/dictionary.htm
fuse

A protective device in the current path that melts or breaks when current exceeds a predetermined maximum value.
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Source:http://www.twysted-pair.com/dictionary.htm

Created: __/__/04
Updated: __/__/__
Checked: __/__/__

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