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Headphone Amplifier
General Knowledge of Headphone And Rules to Purchase
In the strict sense of the word, the headphone is a listening gear with rather big sound body which should be worn on the head. 4 Important Things that You May not Know about headphones It is not the earplug adapted to most Walkmans. Would You Wear headphones ? According to the transduction theory, the headphone can be divided into two broad types:the electrodynamic type(moving-coil type) and the capacitive type (electrostatic type) The principle of electrodynamic type is making the electric current pass through the current loop in magnetic field, to make the diaphragm pronounce. The Advantages of headphone sale You May Not Know The features are the high sensitivity, can withstand higher power, stable sound quality and relatively simple structure. Capacitive type headphone`s wireless circle, the diaphragm is generally used as the movable electrode. When add the signal on the diaphragm, it will get the sound for the attraction and repulsion vibration because of the change of signal polarity on the poles. It is characterized by wide-band, sound quality is excellent, but the structural complexity and the price is high.
- What is a good headphone then? First, it should possess the pure and athentic tone color
The sounding units of the headphones do not require high power, usually not more than 0.2W. Therefore, the sound can be kept just as the original sound source saving amplifying the circuit step by step. Because the application of high-tech materials is currently achieve full-range earphone Regeneration is not difficult, slightly better frequency response of headphones indicators are better than the 20-20KHZ, a lot of high-level point of up to 10-30KHZ, while the distortion of up to 0.2 % or less, and this is the vast majority of sound systems is difficult to achieve. Because the vibrating diaphragm of headphone is light, transient characteristic is good and controllability is also strong. Unlike loudspeakers which may be affected by the movement of pistons and impair the great regenerating quality of sound. Therefore, the headphones have good resolution, wide dynamic range and natural sound quality.
- Sense of spacing. Sound will spread around your head forward in a round way, whereas the sound system, sound spread before the listeners and get forward in depth.
So when you wearing headphones sitting in the concert hall as the front of the middle, almost climbed to the position of the conductor, the whole body immersed in music. This feeling can be extraordinary!
- Accurate feeling of direction. There is only one point of articulation, and it can accurately restore the disposal of stereo position which is made by recording director to instruments of different audio source, and reappears fully the voice played by band by disposal of different direction.
While it is difficult for the sound system to do this. We all konw that after the sound system is placed, there is a fixed listening position. While when you wear the headphones, you can move around easily. You must have a good feel now.
When buying a headphone, you should pay special attention to one technical standard-its impedance. Usually the impedance of headphones of low or middle level is 30-50ohm. Earphones can be plugged directly into walkman or other instruments, such as VCD, LD, CD, DVD, cassette, radio, etc. Dynamic impedance of high-end headphones is more than 300 OHM or more, which is available requiring to be promoted by a dedicated headphone amplifier, such as: Singhai HD-580, HD-600's impedance is 300 OHM.
Have you been touched after listening to my introduction above, it is better to act, buy a headphone as soon as possible. You may even do not believe there will be such a big improvement in your sound quality of Walkman after you have changed your headphones.
About the Author
Headphone amplifier design?
Hi there,
For my university project I am designing something that needs an audio out via headphones.
I have a DAC that will take PCM data from a microprocessor that will give 0-5V. The DAC output goes into a headphone amplifier.
This is where I get confused. Does the signal need to be around 0V so it can swing positively and negatively? The headphone amplifier has a bias pin but i'm really not sure whether the signal needs to be biased?
Someone told me to bias it at 2.5V and then stick a cap in series from the output of the headphone amplifier to the headphone socket itself to negate any DC.
Any ideas on what I should do?
Thanks!!
Not really done much on audio, and all the analogue stuff I did was three years ago. I've found a chip with a charge pump that sorts out negative swing so i'll use that:)
The headphones want to see a signal that swings positive and negative around zero.
You can use the series capacitor but it will need to be large enough so that you do not roll off the low frequency response too much. On the other hand, too high and there will be a large DC pulse at turn-on to initially charge the cap.
If you want the amp to go + and - you will need a + and - power supply for it. (I hope you know that.)