Microbuzzer.com · Posted on 23-07-2010 by microbuzzer

Speaker resistance

speaker  resistance is usually 4 ohms, 8 ohms, 16 ohms, 32 ohms, electronic parameters can be modified according to requirements.

Speaker impedance

Speaker voice coil is a cylindrical magnet wire in the skeleton is made of coil winding, which in addition to certain other than the DC resistance of the inductor also has some. When the audio signal fed to the speaker when the speaker’s voice coil that is up and down vibration in the magnetic air gap, due to the role of voice coil inductance, then will be induced in the coil in an audio input signal with the reverse induction voltage, this and the audio reverse sensing the input voltage of the current will weaken the voice coil, thus increasing the impedance voice coil, with the audio signal frequency would increase this effect will be more and more, making the speaker voice coil impedance with the audio signal increased with increasing frequency. Loudspeaker impedance with the variation of signal frequency and impedance characteristics as the speaker unit. A complete speaker unit by the voice coil impedance the DC resistance of voice coil inductance and coil in the magnetic band to band up and down movement of the induced electromotive force generated by the three parts.
Voice coil DC resistance of voice coil magnet wire is usually the diameter and length of the decision, it has nothing to do with the frequency change in the impedance curve is a straight line parallel to the abscissa; voice coil inductance and coil shape, diameter and turns, respectively, and voice coil inductance with frequency, the higher the frequency, the greater the inductance, coil inductance is reflected in the impedance curve is a rising curve with frequency; the voltage induced in the coil magnetic air gap from the speaker unit of magnetic induction density and magnetic field lines cut the amount of voice coil and other factors. Therefore, from the three formed part of an integrated speaker impedance is a Yang-producing devices to reflect the equivalent input impedance changes with frequency curves. The nominal impedance of the speaker unit is a pure resistance of the resistance, which is measured at the resonant frequency of loudspeaker impedance after the second minimum, which is reflected in the speaker impedance curve is the resonance curve flat part of the post-peak minimum resistance. Then voice coil inductance and back electromotive force generated by vibration of the voice coil back-EMF generated by equal and opposite and cancel each other out, so that the speaker impedance is approximately equal to the DC resistance of voice coil.

Speaker Power

Speakers also called “horn” is a very commonly used in electro-acoustic transducer device, the voice of the electrical and electronic equipment can see it. Speaker is the sound signal into electrical signal transducer device, the speaker’s performance merits a great impact on sound quality. Speakers in the consumer electronics device is one of the most weak, and for sound effect is concerned, it is one of the most important parts. Speakers have the power not to exceed its rated power, otherwise, will be burned voice coil, or coil vibration dispersion. Variety of speakers, and the price varies considerably. Audio power through electromagnetic, piezoelectric or electrostatic effect, so that cone or diaphragm vibration and resonance with the surrounding air (resonance) and sound.

To prevent the current through the circuit, while making the nature of power is converted to heat energy, that of resistance. speaker resistance in ohms or short in Europe, the Greek letter Ω (omega) said. Conductor within a large number of free electrons, when the voltage impose on both ends of the conductor, it will lead to the current generation, but this current can be increased indefinitely, because when the charge Liu Jing This is a material, must bear its resistance, such resistance is transformed into heat energy consumption was.

In physics, with the resistance (resistance) to indicate the role of conductor size on the current obstruction. The greater the resistance of conductors, said conductors on the current role of the larger obstacles. Different conductors, resistance generally different, the resistance is the conductor of a character in itself. Resistor element is present on the current inhibiting energy-consuming devices.

Resistance value of resistive element size generally related to the temperature measured by resistance temperature is the temperature coefficient of the size of the physical quantity, defined as the temperature increased 1 ° C when each resistance to change to CK.

Resistance is the most used of all electronic circuit components.

Conductor resistance is usually the letter R, said the unit is the ohm resistance (ohm), referred to as Europe, the symbol Ω (Greek alphabet, phonetic sounds to read ōu mì gǎ). Larger unit 1000 European (kΩ), megohm (MΩ) (trillion = one million, ie 100 million).

Short resistance resistor (Resistor, usually with “R” that) is the most used electronic circuit components. The main physical characteristics of the resistance is the transforming energy into heat, but also it is an energy component, the current through it to be able to produce. Resistor voltage divider circuit is usually diverted from the role of the signal, the AC and DC signals to pass through the resistor.

KΩ (1000 Euro), MΩ (megohms), their conversion relationship:

1TΩ = 1000GΩ 1GΩ = 1000MΩ 1MΩ = 1000KΩ 1KΩ = 1000Ω (that is, into the 1000 rate)

Tags: ,
Posted in TECHNOLOGY | Comments (0)