Illustrated Dictionary of Electronics
"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"

'Da', 'Db' to 'Deb', 'Dec' to 'Del', 'Dem' to 'Des',
'Det' to 'Dig', 'Dih' to 'Dis', 'Do' to 'Dru', 'Dry' to 'Dz',

DAC. Digital to Analog Converter [D-A]. Related page; DAC Converter Manufacturers.

D Flip Flop. A style of flip flop who's output follows the input when the device is clocked. The Truth Table for a D-Type flip flop is shown to the right. The output changes on the edge of the clock. The most common IC is the 7474; Dual Positive-Edge-Triggered D-Type Flip-Flops with Set and Reset. IC Vendors.

D-Type Truth Table
Truth Table
An IC D Flip Flop; 74374 Block Diagram.

Daisy Chain. A interconnection architecture that connects components in a line, one after the other. An Interface Bus Architecture where one node on the bus feeds only one other node and only receives information from only one node. Refer to the ribbon cable daisy chained connectors shown in the side-bar below.

Damped Natural Frequency. The frequency of an oscillator or other circuit that occurs following a transient input, which might be a step function.

Damped Oscillation. An Oscillation that gradually decreases over time.

Damped Wave. A sinusoidal wave in which the amplitude steadily decreases with time. Often associated with energy loss.

Damping. The process of smoothing out oscillations. The progressive decay with time in the amplitude of the free oscillations in a circuit. The progressive diminution with time of certain quantities characteristic of a phenomenon. In a meter, this process is used to keep the pointer of the meter from over-shooting the correct reading. A mechanical or electrical technique used in synchro receivers to prevent the rotor from oscillating or spinning. Damping is also used in servosystems to minimize overshoot of the load.

Damped Wave

Damping Coefficient. The ratio of damping to critical damping.

Darlington. [Darlington Pair] A transistor pair configured as a dual Emitter amplifier. A transistor configuration that produces a gain equal to the product of both transistors. A transistor pair in which the emitter current of the first transistor equals the Base current of the second transistor. Also refer to Transistor Terms.

Darlington Transistor

D'Arsonval Meter Movement. The permanent-magnet moving-coil movement used in most analog meters. Note that most meters use digital displays. A common Analog meter movement is shown to the right.

Data Bandwidth. The difference between the highest and lowest frequency of the data to be transmitted, usually defined by the -3dB points.

Data Block. A block transfer that moves a unit of data as a complete unit, normally without much of the associated overhead required with a single data transfer. Any required interaction to gain control of an interface bus is only done with the first data transfer, while all other transfers within the block do not require this over-head.

Data Bus. A bus used to transfer data within or to and from a processing unit or storage device.

Data Conversion. The process of changing data from one form of representation to another.

Data Communication. The transfer of information between functional units by means of data transmission according to a protocol.

Data Compaction. The reduction of the number of data elements, bandwidth, cost, and time for the generation, transmission, and storage of data without loss of information by eliminating unnecessary redundancy, removing irrelevancy, or using special coding.

Data Compression. Increasing the amount of data that can be stored in a given domain, such as space, time, or frequency, or contained in a given message length. Reducing the amount of storage space required to store a given amount of data, or reducing the length of message required to transfer a given amount of information.

Data Encryption Standard. [DES] A cryptographic algorithm for the protection of unclassified computer data and published by the National Institute of Standards and Technology in Federal Information Processing Standard Publication 46-1.

Data Frame. A packet of transmitted information that contains at a minimum, the destination address and information being transmitted. Additional information also being transmitted may include the source address, a check word or CRC, and frame length.

Data Integrity. The condition in which data are identically maintained during any operation, such as transfer, storage, and retrieval.

Data Link. The means of connecting one location to another for the purpose of transmitting and receiving data. The communication path between nodes on a network.

Data Multiplexing. The process of combining two or more signals into a single composite signal.

Data Processing. The execution of a systematic sequence of operations performed upon data. Synonymous with information processing.

Data Signaling Rate. [DSR] The aggregate rate at which data pass a point in the transmission path of a data transmission system.

Data Stream. The data passing through a communication channel, in a single operation.

Data Transfer Rate. The average number of bits, characters, or blocks per unit time passing between corresponding equipment in a data transmission system.

Data Transmission. The transfer of information from one place to another or from one part of a system to another. The sending of data from one place to another by means of signals over a channel.

Datum. A datum is the origin from which the location or geometric characteristics of features of a part are established.

PC motherboard

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