"A"
"B"
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
The first portion of the D listing;
"D" Terms
DECOUPLING CAPACITOR. A capacitor used to transfer unwanted signals out of a circuit; for
example, coupling an unwanted signal to ground. Also called a BYPASS CAPACITOR. [Capacitor Terms]
DEEMPHASIS. In FM transmission, the process of
restoring (after detection) the amplitude-vs.frequency characteristics of the signal.
Deenergized. Free from any electrical connection to a source of potential difference and from
electric charge; not having a potential different from that of the earth.
Note: The term is used only with reference to current-carrying parts, which are sometimes energized
(alive).
DEFLECTION COILS. In a cathode-ray tube, coils used to bend an electron beam a desired amount.
DEFLECTION PLATES. Two pairs of parallel electrodes, one pair set forward of the other and at right
angles to each other, parallel to the axis of the electron stream within an electrostatic cathode-ray tube.
DEGENERATION. The process whereby a part of the output signal of an amplifying device is returned to
its input circuit in such a manner that it tends to cancel part of the input.
DEGENERATIVE FEEDBACK. Feedback in which the feedback signal is out of phase with the input
signal; also called NEGATIVE FEEDBACK.
DEGREE-OF-FREEDOM. The number of axes about which a gyro is free to precess.
DEIONIZATION POTENTIAL. The potential at which ionization of the gas within a gas-filled tube
ceases and conduction stops; also referred to as extinction potential.
DEIONIZATION TIME. In a spark gap, the time required for ionized gas to return to its neutral state
after the spark is removed.
DELAY LINE. A transmission line, or equivalent
device, used to delay a signal. IC Delay Line Manufacturers
DELIMITER. A character used to indicate the beginning and end of a character string, i.e., a symbol stream, such as words, groups of words, or frames. A flag that separates and organizes items of data.
DELTA. A three-phase connection in which windings are connected end-to-end, forming a closed loop that resembles the Greek letter delta. A separate phase wire is then connected to each of the three junctions.
DEMODULATION. The removal of intelligence from a transmission medium. The recovery, from a modulated carrier, of a signal having substantially the same characteristics as the original modulating signal.
DEMODULATOR. A circuit used in servo-systems to convert an ac signal to a dc signal. The magnitude of the dc output is determined by the magnitude of the ac input signal, and its polarity is determined by whether the ac input signal is in or out of phase with the ac reference voltage.
DeMORGAN'S THEOREM. A theorem which states that the inversion of a series of AND applications is equal to the same series of inverted OR applications, or the inversion of a series of OR applications is equal to the same series of inverted AND applications. Also refer to Timing Hazards for applications
DENSITY. The compactness of a substance. Mass per unit volume.
DEPLETION REGION. The region in a semiconductor where essentially all free electrons and holes have been swept out by the electrostatic field which exists there.
Next set of "D" Terms and definitions
