Friday, March 11, 2011

Electronics Terms .......... Part 3

Capacitor - a charge storage device made up of two metallic plates separated by a dielectric, with equal but opposite charges. The AC impedance of a Capacitor is (1 / jWL) and acts as an open circuit in DC applications.
Circuit - a complete path that allows electrical current from one terminal of a voltage source to the other terminal.
Class A - transistor amp conducts for the entire cycle of input signal, conduction angle 360 deg. Runs hot, as the transistors in the power amp are on all the time, but has high sound quality.
Class B - positive and negative halves of the signal dealt with by different parts of the circuit, the output devices switching continually. Runs cooler, but the sound is not as pure.
Class AB - biasing the transistor amp at a non-zero DC current much smaller than the peek current of the signal source. Second transistor conducts during negative half cycle of waveform and the currents from the 2 transistors are combined at the load. A compromise between sound quality of Class A and efficiency of Class B. Most amp designs employ this method.
Clipping - a form of distortion caused by cutting off the peaks of audio signals. Clipping usually occurs in the amplifier when it's input signal is too large or when the voltage rails of the power supply cannot deliver the necessary voltage to the power amp.
Coloration - any change in the characteristic of sound that reduces naturalness, such as an overemphasis of certain tones.
Compliance - the relative stiffness of a speaker suspension, specified as Vas.
Cone - the conical diaphragm of a speaker attached to the voice coil which produces pulsation's of air that the ear detects as sound.
Crossover Frequency - the frequency at which the driver's roll off at - usually when response is down -3dB.
Crossover Network (Filter) - an electric circuit or network that splits the audio frequencies into different bands for application to individual speakers.
Current (I) - the flow of electrical charge measured in amperes.

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