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DICTIONARY OF ELECTRONICS
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- half power point
-
A frequency at which the power
is 50% of maximum. This
corresponds to 70.7% of maximum
current or voltage.
- h-parameters
-
(hybrid parameters) Transistor
specifications that describe the
component operating limits under
specific circumstances.
- half wave rectifier
-
A diode rectifier that converts
AC to pulsating DC by
eliminating either the negative
or the positive alternation of
each input AC cycle.
- harmonic
-
Sine wave that is smaller in
amplitude and some multiple of a
fundamental frequency. Example:
880 Hz. is the second harmonic
of 440 Hz., 880 Hz. is the third
harmonic of 220 Hz.
- hartley oscillator
-
An oscillator that uses a tapped
inductor in the feedback
network.
- henry
-
The basic unit of inductance.
- HERTZ
-
(Hz.) Unit of frequency. One
hertz is equal to one cycle per
second.
- high fidelity
-
(Hi Fi)Sound reproduction
equipment that reproduces sound
as near to the original sound as
possible
- high-pass filter
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A tuned circuit designed to pass
all frequencies above a
desnigated cut-off frequency.
Frequencies below the cut-off
frequency are rejected or
attenuated
- high tension
-
Lethal voltage in the kilovolt
range and above.
- hole
-
A gap left in the covalent bond
when a valence electron gains
sufficient energy to jump to the
conduction band
- hologram
-
Three-dimensional picture
created with a laser.
- holography
-
The science dealing with
three-dimensional optical
recording.
- horizontally polarized
wave
-
Electromagnetic wave that has
the electric field in the
horizontal plane.
- hybrid circuit
-
Circuit that combines two
technologies (passive and active
or discrete and integrated
components) onto one
microelectronic circuit. Passive
components are usual made by
thin film techniques, while
active components are made with
semiconductor techniques.
- hysteresis
-
Amount that the magnetization of
a material lags the magnetizing
force due to molecular friction.
In Schmitt Trigger circuits, the
difference between the upper and
lower trigger points.
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