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 |
- octave
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Interval between two sounds whose fundamental frequencies differ by a ratio of 2 to 1. 440 Hz. is one octave above 220 Hz.
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- offset null
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An op amp control pin used to eliminate the effects of internal component voltages on the output of the device.
- ohm
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Unit of resistance symbolized by the Greek capital letter omega (W).
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- ohmmeter
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Device used to measure electrical resistance.
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- Ohm's law
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Relationship between voltage, current and resistance. Ohm's law states that current in a resistance varies in direct proportion to voltage applied and inversely proportional to resistance.
- Ohms per volt
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Refers to a value of ohms per volt of full scale defection for a moving coil meter movement. The number of ohms per volt is the reciprocal of the amount of current required to produce full scale deflection of the needle. A meter requiring 50 micro-amps for full scale deflection has an internal resistance of 20 kW per volt. The higher the ohms per volt rating, the more sensitive the meter.
- one-shot
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Monostable multi-vibrator.
- op-amp
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Abbreviation for operational amplifier.
- open loop gain
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Gain of an amplifier when no feedback is present.
- open loop mode
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An amplifier circuit having no means of comparing the output with the input. (No feedback.)
- operational amplifier
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A high gain DC amplifier that has a high input impedance and a low output impedance. Op-amps are the most basic type of linear integrated circuits.
- oscillate
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To produce a continuous output waveform without an input signal present.
- oscillator
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An electronic circuit that produces a continuous output waveform with only DC applied.
- oscilloscope
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An instrument used to display a signal graphically. Shows signal amplitude, period and wave shape in addition to any DC voltage present. A multiple trace oscilloscope can show two or more waveforms at the same time for phase comparison and timing measurements.
- out of phase
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When the maximum and minimum points of two or more wave shapes do not occur at the same time.
- output
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Terminal at which a component, circuit or piece of equipment delivers current, voltage or power.
- output impedance
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Impedance measured across the output terminals of a device without a load connected.
- output power
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Amount of power a component, circuit or system can deliver to a load.
- overload
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Condition that occurs when the load is greater than the system was designed to handle. (Load resistance too small, load current too high.) Overload results in waveform distortion and/or overheating.
- overload protection
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Protective device such as a fuse or circuit breaker that automatically disconnects a load when current exceeds a predetermined value.