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  • How to exclude amplifier noise during tuning

    Tuning process, often encounter different procedures for the noise problem, the circuit board has been fabricated, the following methods can cure or reduce noise.

    First, the power amplifier board after the current hum

    1, the speaker into the amplifier, turn on the power, move the power transformer position until the hum weakened, then the metal cover (which can be iron) and live fixed.

    2, if the transformer leads to the secondary cable, it should be opened for braided stranded wire.

    3, the output of the circuit board speaker output negative terminal welding, after the filter capacitor copper foil at a large area can be found at a lower noise point of welding.

    4, increase or replace the filter capacitor. This method is rarely used, I have done a number of tests to prove that more than 25V, the power amplifier last stage current 2 ~ 7.5A power supply, filter 3 capacitance value of not less than 3300 F will not appear current hum.

    5, change the installation position of the power amplifier board, the radiator transverse placed between the transformer and the circuit board, play a magnetic shielding effect, reducing the current hum.

    6, appropriate changes in component pin height, especially the feedback resistance and coupling capacitance. The discrete components of the voltage amplification part should also be noted that the height of their pins from the circuit board 2 ~ 5.5mm better.

    Second, the power amplifier level sound

    1, take 1000pF porcelain dielectric capacitance, diode in the rectifier circuit and welding one. After the filter capacitor between the positive and negative power supply branch and the ground into each of 1 ~ 3 100F electrolytic capacitor and 0.1F MKT capacitor.

    2, take the capacity of 220 ~ 1500pF between the film capacitor into the signal input and audition between the ground, use the smallest chime beats earbuds sound of a capacitor; and play a familiar music, with hearing requirements without affecting the high frequency Features prevail.

    The above noise prevention method is performed by cutting off the front input. The same can be used for pre-amplification noise reduction.

    Third, the amplifier's pre-hum

    1, the DC power line "+" side disconnect, string into the 100 ~ 300mH inductance, non-welding.

    2, with a plastic stick or bamboo chopsticks to clip the audio input to beats by dre the preamplifier board lead, look for a hum at the smallest fixed.

    3, change the front and rear amplification board grounding point. If the two are connected cheap beats by dr dre by a shielded cable, the shielding mesh at one end of the shielded cable should be soldered to the input of the rear stage and the other end ungrounded. The front and audio input interface wiring is also true, only one end of the audio input beats by dre grounded. In this way, no ground loop will be formed and no annoying hum will be coupled.

    Fourth, the power amplifier before sound

    Mainly in the feedback tone circuit, especially scaffolding welding, high-frequency sound serious. The solution is to use a thin copper sheath to shield it, or change into passive attenuation type tone circuit, which can effectively reduce the squeal sound.

    Several of the above noise reduction measures are limited to transistors, integrated circuit amplifier applications. Of course, the circuit board design is crucial, such as power, audio signal routing, analog and digital ground and so on.

    2018-02-23 10:20:15
  • How to properly protect the ear headphones?

    Wear headphones, the world has nothing to do with me. Such a popular word on the network has become the motto of many fashion people. Today in the information age, people wearing headphones everywhere, especially white-collar workers, due to increased pressure from work, less communication between friends, and no communication with their families, so put on headphones, as many white-collar women One of the ways to self-regulate and relax. Listen to us in the music, is not feeling? Sad? Happy? But you know, while you are comforting, but "hurt" our ears. Experts point out that now there are many young people with this bad habit, as everyone knows, which will be harmful to their hearing system. Because the earphone directly approaches the tympanic membrane, the range of acoustic wave propagation is small and concentrated, and the stimulation of the auditory nerve of the eardrum is relatively large, which is likely to beats earphones cause damage to the eardrum and the beats earbuds inner ear. The noise accumulated to a certain degree will cause tinnitus, earache, headache and dizziness , Emotional stress, memory loss and other symptoms, in addition, long-term wear may also cause ear inflammation. White-collar workers have noticed, how to reduce the headphone damage to the ear?

    A suggestion: buy beats by dr dre high quality headphones

    Buy earbuds may wish to pick the headphones can prevent external noise, to reduce the ambient noise and increase the chance of Walkman volume. The best headset to wear headdress, earbud headphones than hearing it less damage. Because the earbud headphones plug directly in the external auditory canal, the sound is not provenance, all toward the tympanic membrane in the past, the sound is all received by the tympanic membrane, hearing damage greater. In general, hear the same volume of music, with earbuds headphones than the volume of headphones 7 to 9 dB high.

    Second proposal: to master the 60-60 principle

    People often wear MP3 to listen to music should master the 60-60 principle, which is also internationally recognized method of hearing protection. That is, when listening to music, the volume should not exceed 60% of the maximum volume, continuous listening time should not exceed 60 beats earbuds minutes.

    Suggest three: try to listen to music in a quiet environment

    Experts believe that once the external environment becomes noisy, the output of the headset will be subject to varying degrees of interference. In a quiet environment, the output sound of several headphones is almost the same.

    Long-term wear headphones seriously harmful, especially in-ear headphones. It is recommended to avoid wearing too much headphones.

    In the purchase of headphones when China Headphone Trading Network as a professional platform is your best choice, the platform remitted thousands of headphone manufacturers from across the country, have strict manual qualification review, effectively protect the interests of buyers.

    2018-02-10 10:28:27
  • Long beats by dr dre knowledge, singing these beats by dre benefits

    Singing can be said cheap beats by dre to be a very common entertainment in our daily life. As for the benefits of singing, we may all feel that nothing more than relieving stress. In fact, the benefits of singing go far beyond that. Xiaobian told you to sing today The four major benefits, pick up your little notebook down Oh. First, singing can open the human diaphragm. This is an internal circulation massage, which can not be replaced by most activities. Second, it can enhance the body's immune function. Third, it can train our neural pathways. Whether the elderly, young students, or homeless people, the mood will be better after the choir singing. Xiaobian secretly tell you that singing can also play an anti-aging effect, because investment singing activities can be moved to many usually hard to move to the face tissue, so as to achieve anti-aging, to maintain the effectiveness of skin elasticity. How can we put it into singing? Condenser microphones let you release yourself and fall in love with singing. Able to make an immersive microphone is not usually our microphone comes with the microphone, the real high-quality microphone to beautify your voice to convey the most beautiful voice. Microphone is the charm of self-developed chip processing system, after repeated testing engineers and improve the overall upgrade, so the sound is better. Built-in monitoring, real-time return ear, let you sing at the same time you can hear your own voice, precise control of pitch. At the same time has a good heart-oriented pickup and high-sensitivity output, low noise, effective avoidance of reverberation, isolation of other voices and other characteristics, with it you can have a pleasant voice.

    The integrated metal body with a high-capacity lithium battery capacity of up to 1200 mAh or so, K song more fun. High-sensitivity capacitive high degree of marks, sound better. There are also four tuning panels that can be retouched and tuned for the same experience as studio recordings. Microphone is very portable, compatible with mobile phones, when connected to the computer to ensure compatibility, to better docking mobile phones, computers, electric instruments, etc., to beats earphones achieve accurate signal docking. The use of capacitive wheat noise reduction effect is good, pickup ability to add full, pure sound permeability. Sound card panel using the piano baking process, to better water stains, scratch-resistant flowers.

    2018-02-08 10:13:44
  • On the sound of "knot"

    The sense of knot in the appreciation of the movie and the restoration of classical music (especially in the large system performance) is a very important attribute, and even can be seen as the core attributes of hifi. Here is a brief introduction.

    Resolution should not be difficult to understand, but as important as resolution hifi attributes, knot feeling, it seems a lot of new friends do not know, here to briefly introduce it, by the way why IE8 value of the problem . If you burn the case, the knot feeling should be directly felt, low-frequency stability, positioning quasi-harmonic box, the knot is generally ok ~

    Junction should be the sound field properties, but also the most important sound field properties, in the case of poor pull together open the horizontal field, will lead to deformation of the sound field, the hearing impact is very serious.

    Conclusion image with a metaphor, it should be similar to the lens inside the camera focus. The same sound and pattern, you can also focus on a certain point or surface

    Therefore, the quality factors beats headphones on sale of the sound field associated with the knot are mainly positioning and depth and shape, so that we can feel a stereo sound when the sound field is large.

    Of course, the word alone is the image of condensation. There are some requirements for positioning, but not the first, the sound field has a certain width requirements, but not the first, the highest depth of the request, the wrong position will lead directly to the formation of a cup with a knot (also known as the concept of environmental images ).

    From the solo composition

    For example, the sound of a flute should occur in a small area, slightly larger than a point, and the knot beats by dre should be stable (high in low frequencies, low in low frequencies, and knotted in erratic form) The knot is the form of resonance of the box produced in two cubic meters of space. At this moment, you hear the vaguely sounding sound that is more vague than the whistle sound, diverging fast, having a certain reverberation and containing a large amount of overtone sound image, Very transparent, but the break will not be sharp (high frequency overtones lack of energy, high frequency easily out of control, ue moving iron is often the lack of panic reverberation signal).

    Low-frequency quality requirements here are very demanding equipment, Intuitively, if it is a percussion type of low-frequency instruments, the bass is issued to be able to hear a larger drum shape, if the feeling of low frequency dive, texture , But the drumhead is a small, not a face, then the headset's ability to make the picture is worse, such as se530 ...

    Another good sense of knot, you have to be able to hear the voice of a person's mouth is big and small, if it is a face, the voice is not enough cohesion, then it is very bad. Even able to determine the amount of breath of a lyrics.

    The requirements for percussion is to be able to hear the size of the drumhead, to be able to feel the vibration of a stable diaphragm form.

    Sound divergence effect and the degree of cohesion is a headphone for the need to choose the problem, one of us will experience a situation, when we open a large beats by dre wireless player volume, the sound will be more condensed, but may produce poor Sense of hearing, and when the volume is small, the sound sounds more scattered. Therefore, the image of the front end, in particular, the demand for power amplifier will not be worse than the headphone equipment, which is particularly good for speakers, the ideal state is that we need at the right volume at the same time have a good sense of cohesion and divergence vague sense of blur.

    Finally, the most important and difficult part of the image interpretation is the group harmony (imagery of the energy field), a complete manifestation of a process of energy swell and decline, especially the blending of strings and tubes When the band unison. This involves a trade-off as mentioned above. In addition, it also involves the ability to dynamically restore a system of equipment.

    In reality, most of the music in fact is the sound of a mixed vocalization that requires a fuzzification because everyone who has been to the symphony scene knows that the sound in the hall is very loud . Will not produce a clear boundary.

    When the violin group rubbing strings, there will be a large number of overtime segments missing signal timing (non-reverberation), which is a very vague feeling, the so-called "sense of air", once the equipment to the scene is too clear, then The sense of music will be greatly reduced, we usually think that sound is listening. The good sense of hearing is the need for music "sense of air" as the tide blows.

    Out of color here, a good depth of relationship, excellent ability to make the environment, making interpretation of the big symphony in the context of no chaos, there will be seamless effects. However, when the interpretation of the small system is clearly blurred some of the boundaries, but fortunately, the musical sense is still superior, after all, the overtone performance is based on a strong tuning strength.

    More vividly, the outstanding sense of imagery is that the sound image in a large symphony of the performance of the three different levels of effect, the violin group to bring rich beats headphones on sale "sense of air" (blur) at the same time, The voices of groups playing in the line, and the percussion instrument behind the group when the effect is the basis of Mount Tai - steady, together, that is, to be able to show when the glacier movement that pressure and pounds the momentum, the knot is the most brilliant knot.

    In summary, the sense of knot for tri-band and dynamic control have their own requirements,

    Low-frequency to be stable, to have energy, IF to balance, to connect the high-frequency overtones. The high frequency in the case of the extension of the frequency response, to ensure high-resolution overtone section and frequency response curve balance in order to obtain a stable image sense. Overall, the tri-band energy distribution of the headphone should be balanced with a pyramid to ensure that the image is not erratic due to dynamic distortion in a large scene.

    Of the moving iron earplugs in the intermediate frequency and high frequency has done some processing, will make the high overtone section can not be ignored distortion, but also can bring about a transparent and elegant feeling, the key lies in not to please the human ear (interference monitor? ) Part of the pan audio band erased. So the sound immediately clear up, but this effect on the knot is more serious.

    2018-02-06 10:29:11
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