Technical Engineering Dictionary
"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"

'O' to 'On', 'Op' to 'Oq', 'Or' to 'Oz'

Op Amp. Short for Operational Amplifier.

Opaque. Those substances that do not transmit (pass) any light rays; that is, the light rays are either absorbed or reflected.

Open Circuit. The condition of an electrical circuit caused by the breaking of continuity of one or more conductors of the circuit; usually an undesired condition. A circuit that does not provide a complete path for the flow of current. A circuit shall be considered as open circuited if halving the magnitude of the terminating impedance does not produce a change in the parameter being measured greater than the specified accuracy of the measurement.

Open Circuit Voltage. The output voltage of a circuit with no load attached, no current draw.

Open Collector. [OC] A type of output used with integrated circuits that leaves the collector of the final transistor open or unconnected [from Vcc]. An open collector IC's output may be tied to a voltage source other than the voltage used to power the rest of the IC, used for driving devices powered by different voltage sources, as in relays.

Open Collector 7438 IC Circuit
Open Collector Description

Open-Ended Line. A transmission fine that has a terminating impedance that is infinitely large.

Open Loop. An amplifier or control system that does not use feedback either for gain or control.

Open Loop Gain. The gain of an amplifier without the amplifier using any feedback to increase the gain [positive feedback]; although feedback could also be used to decrease gain [negative feedback].

Open Systems Interconnection. [OSI] Pertaining to the logical structure for communications networks standardized by the International Organization for Standardization (ISO).

Operand. An entity on which an operation is performed.

Operating Life. The expected life of a component or device, while being operated within its operating specifications. Related term; Accelerated Life Testing. See the Estimated life vs junction temperature graph to the right for a particular IC.

Operating Point. The point on a family of characteristic curves of a transistor [for example] that represent the magnitude of voltage and current when the component is operating. Refer to Load Line for a graph of characteristic curves.

Operational Amplifier. [Op Amp] An amplifier designed to perform computing or transfer operations and that has the following characteristics:

(1) very high gain
(2) very high input impedance
(3) very low output impedance.
OpAmp Manufacturers list
A 741 Op Amp
A LM101 Op Amp
A LM118 Op Amp
Read more on Op-Amps.

Operational Amplifier Impedance Diagram

Operational Life. Same as operating life.

OP iLINK. A Sony term which refers to the FireWire interface.

Optical Attenuator. In optical communications, a device used to reduce the power level of an optical signal.

Optical Connector. A demountable device for attaching a cabled or uncabled optical fiber to another, or to an active device such as a transmitter.

Optical Coupler. A coupler composed of an LED [light source] and a photodiode [light detector] contained in a light-conducting medium, all in a single package. Suitable for frequencies in the low-megahertz range. [Manufacturers of Opto-Coupler ICs]

Optical Detector. A transducer that generates an output signal when irradiated with optical energy.

Optical Fiber. A filament of transparent dielectric material, usually glass or plastic, and usually circular in cross section, that guides light.

Optical Isolator. [Optoisolator] A device that uses a short optical transmission path to accomplish electrical isolation between elements of a circuit. An Optoelectronic device uses both a light source and a light detector in the same package. Also called an Optical Coupler.

Optical Repeater. In an optical communication system, an optoelectronic device or module that receives an optical signal, amplifies it (or, in the case of a digital signal, reshapes, retimes, or otherwise reconstructs it), and retransmits it as an optical signal.

Optical Spectrum. The range of frequencies in the visible range. [Optical Spectrum Chart].

Optimum Load. The impedance or resistance value of a load that results in maximum power transfer, which occurs when the source impedance matches the impedance of the load.

Optimum Working Frequency. The most practical operating frequency that can be used with the least amount of problems and is roughly 85 percent of the maximum usable frequency.

Optoelectronic. Pertaining to any device that functions as an electrical-to-optical or optical-to-electrical transducer, or an instrument that uses such a device in its operation.

Optoelectronic Devices. Devices that either produce or use light in their operation. Related term; Photo-Transistor.
However there are a number of possible examples.

Pertaining to any device that functions as an electrical-to-optical or optical-to-electrical transducer, or an instrument that uses such a device in its operation.

PC motherboard

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