18WuD2x

B 1. Symbol for SUSCEPTANCE. 2. Symbol for
FLUX DENSITY. 3. Abbreviation of BATTERY. 4.
Symbol for BORON. 5. Symbol for base of transistor
(see BASE, 1). 6. Abbreviation of BASS. 7.
Abbreviation of BEL. 8. Anode voltage or main operating
voltage in any circuit (when used with
sign). Also see B VOLTAGE.
b 1. Symbol for SUSCEPTANCE. 2. Symbol for
base of transistor (see BASE, 1). 3. Abbreviation
of BASS. 4. Symbol for BARN.
B&S See AMERICAN WIRE GAUGE.
B5-cut crystal A piezoelectric plate cut from a
quartz crystal in such a way that the face of the
plate is at an angle, with respect to the z-axis of
the crystal. This type of crystal has good frequency
stability under conditions of changing
temperature.
BA Abbreviation of BATTERY. Also see B and BAT.
Ba Symbol for BARIUM.
babbit A relatively soft, tin-base alloy of various
compositions. One composition contains 7.4%
antimony, 3.7% copper, and 88.9% tin.
babble Interference caused by crosstalk from a
number of channels.
babble signal A jamming signal containing babble
components. See BABBLE and JAMMING.
BABS Abbreviation of BLIND-APPROACH BEACON
SYSTEM.
baby monitor A short-range radio transmitter and
receiver that can be used to listen at a distance to
the sounds in an infant’s room. The transmitter
contains a sensitive microphone, a whip antenna,
and a power supply. The unit can be placed on a
table or desk, or even on the floor near the baby’s
crib. The receiver is similar to a handheld
“walkie-talkie.” It is battery-powered and can be
carried around. It has an inductively loaded, short
“rubber duckie” antenna similar to the antennas
on cordless telephone sets. The receiver can pick
up signals from the transmitter at distances of up
to about 200 feet. The radio-frequency signals
pass easily through walls, ceilings, and floors.
back bias 1. A feedback signal (negative or positive).
2. Reverse bias (also see BIAS). 3. A reverse
bias voltage, obtained from a voltage divider connected
between a voltage source and ground.
In
R1
R2
B−
back bias, 3
B+
R1, R2
provide
bias
Out
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