- fall time
Time it takes the falling edge of a pulse to go from 90% of
peak voltage to 10% of peak voltage.
- farad
- The basic unit of capacitance.
- feedback
- A portion of the output signal of an amplifier which is
connected back to the input of the same amplifier.
- feedback amplifier
- An amplifier with an external signal path from its output
back to its input.
- ferrite
- A powdered, compressed and sintered magnetic material having
high resistivity. The high resistance makes eddy current losses low at
high frequencies.
- ferrite bead
- Ferrite composition in the form of a bead. Running a wire
through the bead increases the inductance of the wire.
- ferrite-core inductor
- An inductor wound on a ferrite core.
- ferrites
- Compound composed of iron oxide, a metallic oxide and
ceramic. The metal oxides include zinc, nickel, cobalt or iron.
- ferrous
- Composed of and or containing iron. A ferrous metal exhibits
magnetic characteristics as opposed to non-ferrous material.
- fiber optics
- Laser's light output carries information that is conveyed
between two points by thin glass optical fibers.
- field effect transistor
- (FET) A voltage controlled transistor in which the source to
drain conduction is controlled by gate to source voltage.
- filament
- Thin thread of carbon or tungsten which produces heat or
light with the passage of current.
- filter
- Network consisting of capacitors, resistors and/or inductors
used to pass certain frequencies and block others.
- 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).
- floating ground
- Conmmon connection in a circuit that provides a return path
for current but is not connected to an earth ground.
- 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.
- flux
- Material used to remove oxide films from the surface of
metals in preparation for soldering.
- flux
- In magnetism, the magnetic field consisting of lines of
force.
- flux density
- The concentration of magnetic lines of force. Determines
strength of the magnetic field.
- flywheel effect
- Sustaining effect of oscillation in an LC circuit.
- forward bias
- A PN junction bias which allows current to flow through the
junction. Forward bias decreases the resistance of the depletion layer.
- free electrons
- Electrons that are not in any orbit around a nucleus.
- 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.
- frequency
- Rate of recurrence of a periodic wave. Measured in Hertz
(cycles per second).
- frequency-division multiplex
- (FDM) Transmission of two or more signals over a common path
by using a different frequency band for each signal.
- frequency-domain analysis
- A method of representing a waveform by plotting its amplitude
against frequency.
- frequency meter
- Meter used to measure frequency of periodic waves.
- frequency multiplier
- A harmonic conversion circuit in which the frequency of the
output signal is an exact multiple of the input frequency.
- frequency response
- Indication of how well a circuit responds to different
frequencies applied to it.
- frequency response curve
- A graph of amplitude over frequency indicating a circuit
response to different frequencies.
- full scale deflection
- (FDS) Deflection of a meter's pointer to the farthest
position on the scale.
- full wave rectifier
- Rectifier that makes use of the full AC wave in both the
positive and negative half cycles.
- function generator
- Signal generator that can produce sine, square, triangle and
sawtooth output waveforms.
- fundamental frequency
- Lowest frequency in a complex waveform.
- fuse
- A protective device in the current path that melts or breaks
when current exceeds a predetermined maximum value.
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