18WuD2x

422 low power • lug
particular application. The term is arbitrary; several
hundred watts might be regarded as low
power in one situation, whereas a fraction of a
watt would be implied in another.
low-print recording tape Magnetic tape that is
less susceptible to print-through than conventional
tape.
low Q For a component or circuit, a low quotient for
the ratio of reactance to resistance (X/R). This is a
relative term because a particular Q value considered
low in one situation might be high in other
circumstances. Also see FIGURE OF MERIT, 1.
low tension See LOW VOLTAGE.
low voltage 1. A voltage considerably lower than
that ordinarily encountered in a particular application.
The term is arbitrary; several hundred
volts might be regarded as low in one situation,
and a fraction of a volt would be implied in another.
2. In a television receiver, the supply voltage
applied to all points other than the
high-voltage circuit or the picture tube.
low-voltage rectifier In a television receiver, the
rectifier that supplies power for the low-voltage
stages. See LOW VOLTAGE, 2.
LP 1. Abbreviation of LOW POWER. 2. Abbreviation
of LONG PLAY. 3. Abbreviation of low pressure.
L pad An attenuator consisting of one series arm
and one shunt arm, arranged in such a way that
the schematic representation of the circuit resembles
an inverted capital letter L. It is noted for
its constant input resistance or impedance as the
amount of attenuation is varied.
LPB Abbreviation of LIGHTED PUSHBUTTON.
L P band A section of the L BAND extending from
390 to 465 MHz.
lpm Abbreviation of lines per minute: the output
speed of a line printer.
lpW Abbreviation of lumens per watt; lm/W is preferred.
Lr Symbol for LAWRENCIUM.
L + R, L – R The sum and difference of the left (L)
and right (R) channel signals in a stereo highfidelity
sound system. The L + R signal is the inphase
combination of the two channels; the L – R
signal is the out-of-phase combination.
L regulator See L-TYPE VOLTAGE REGULATOR.
LRR Abbreviation of LONG-RANGE RADAR.
LR time constant See INDUCTANCE-RESIS-
TANCE TIME CONSTANT.
LSA diode Abbreviation for limited-space-chargeaccumulation
diode. A solid-state diode that acts
as a microwave oscillator.
LSB 1. Abbreviation of LOWER SIDEBAND. 2. Abbreviation
of LEAST-SIGNIFICANT BIT.
L S band A section of the L band that extends from
900 to 950 MHz.
LSC Abbreviation of LEAST-SIGNIFICANT CHAR-
ACTER.
LSD Abbreviation of LEAST-SIGNIFICANT DIGIT.
L section 1. A filter section whose schematic representation
has the general shape of an inverted
capital letter L. 2. An attenuator circuit whose
schematic representation has the general shape
of an inverted capital letter L. 3. A network section
consisting of a series (input) impedance arm
and a shunt (output) impedance arm. See L PAD.
4. A right-angle bend in coaxial cable (see ELL).
LSI See LARGE-SCALE INTEGRATION.
LSSC Abbreviation of LOWER SIDEBAND SUP-
PRESSED CARRIER.
L T band A section of the L BAND extending from
780 to 900 MHz.
LTROM Abbreviation of LINEAR-TRANSFORMER
READ-ONLY MEMORY.
L-type antenna See INVERTED-L ANTENNA.
L-type voltage regulator A simple voltage regulator
containing a series current-limiting resistor
and shunt regulator (zener diode, VR tube, voltage-dependent
resistor, etc.). The schematic
representation resembles an inverted capital
letter L.
+
−
From
power
supply
output
R1
Unreg
Unreg
+ + +
Reg
+
VR
From
power
supply
output
R1
L-type voltage regulator
Reg + (High)
VR
Reg + (Low)
VR
− − −
lt-yr Abbreviation of LIGHT-YEAR.
Lu Symbol for LUTETIUM.
Lucalox General Electric’s translucent ceramic; its
chief constituent is polycrystalline alumina. The
material has many applications in electro-optics.
Lucite Trade name for METHYL METHACRYLATE
RESIN.
Luddites During the Industrial Revolution, people
who sabotaged automated factory equipment because
they believed the machines would put
them out of work. The word comes from the name
of Ned Ludd, their supposed leader. The term is
sometimes applied nowadays to people who fear
computers, robots, and other technological innovations
because of real or imagined threats to
personal job security.
LUF Abbreviation of LOWEST USABLE FRE-
QUENCY.
lug 1. A contact attached to the end of a wire lead
to facilitate connection to a binding post. 2. A