BLIPSee PIP .
BLOCK DIAGRAMA diagram in which the major components of an equipment or a system are
represented by squares, rectangles, or other geometric figures, and the normal order of progression of a
signal or current flow is represented by lines .
BLOCKED-GRID KEYINGA method of keying in which the bias is varied to turn plate current on and
BLOCKINGA condition in an amplifier, caused by overdriving one or more stages, in which the
amplifier is insensitive to small signals immediately after reception of a large signal .
BOLOMETERA loading device that undergoes changes in resistance as changes in dissipated power
BONDING WIRESFine wires connecting the bonding pads of the chip to the external leads of the
BOOLEAN(1) Pertaining to the process used in the algebra formulated by George Boole. (2) Pertaining
to the operations of formal logic .
BOOLEAN ALGEBRAA system of logic dealing with on-off circuit elements associated by such
operators as the AND, OR, NAND, NOR, and NOT functions .
BOOLEAN LOGICSee BOOLEAN ALGEBRA .
BOUNDARY CONDITIONSThe two conditions that the E-field and H-field within a waveguide must
meet before energy will travel down the waveguide. The E-field must be perpendicular to the walls and
the H-field must be in closed loops, parallel to the walls, and perpendicular to the E-field .
BRANCHAn individual current path in a parallel circuit  .
BREAKIn a switch, the number of breaks refers to the number of points at which the switch opens the
circuit; for example, single break and double break .
BREAKDOWNThe phenomenon occurring in a reverse-biased semiconductor diode. The start of the
phenomenon is observed as a transition from a high dynamic resistance to one of substantially lower
dynamic resistance. This is done to boost the reverse current .
BRIGHTNESS CONTROLThe name given to the potentiometer used to vary the potential applied to the
control grid of a CRT .
BROADSIDE ARRAYAn array in which the direction of maximum radiation is perpendicular to the
plane containing the elements  .
BRUSHESSliding contacts, usually carbon, that make electrical connection to the rotating part of a motor
or generator .
BUFFERA voltage amplifier used between the oscillator and power amplifier .
BUFFER AMPLIFIERAn amplifier that isolates one circuit from another. It decreases the loading effect
on an oscillator by reducing the interaction between the load and the oscillator  .