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Previous section of "O" definitions and terms
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.
OPEN-ENDED LINE. A transmission fine that has a terminating impedance that is infinitely large.
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,
and (3) very low output impedance. OpAmp Manufacturers
OP iLINK. Another term which refers to the FireWire interface used by Sony. FireWire is also known by the term IEEE-1394
OPTICAL COUPLER. A coupler composed of an LED and a photodiode and contained in a lightconducting
medium. Suitable for frequencies in the low-megahertz range.
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 DEVICES. Devices that either produce or use light in their operation.
Next section of "O" definitions and terms
