How to deal with the noise of car audio
How to deal with the noise of car audio：
First, the noise often through the following ways to invade your sound system:
A, intrusion of power lines (through the host and power lines into the system).
B, the current through the ground (through the antenna ground and power amplifier).
C, the other wire interference (through the antenna receiving line and the original car trouble)
D and other electrical interference (electric horn and generator).
Note: A, B, C items are related.
Two, the noise of the Countermeasures
Usually to withstand the noise of the use of parts, there are car audio capacitor (high frequency noise is particularly effective), the flow loop (inductance), filter, ground wire, etc., to resist the noise caused by the burning system.
1, view the burning coil positive on the capacitor is not devices, if capacity decreases with the brief of a platinum contact ablation, spark interference, need to replace the capacitance is O, 5UF/400V electrodeless capacitive, view the burning high voltage line is not the use of carbon line, if the use of metal wire and a brief trouble, by its is radio some trouble is grim, so must be replaced. Can increased resistance resistance method, Yang spark noise, the method is 1 megohm resistor series with burning coil output main high-voltage wire, reduce trouble.
2, motor noise cleaning
First car audio conversion device and a signal line away from the motor and motor line, available a non-polar of capacitor are connected in parallel at both ends of the motor, but also to use two inductors parting Series in the positive and negative pole line of the motor, and then two electrodeless capacitive parting is connected to the positive and negative pole line of the motor. At the other end of the grounding form filter circuit, the role of absorption motor carbon brush spark the noise reduction.
3, there is no relay electric horn noise, cleaning methods are mainly the following:
A, in which a speaker of the terminal on the ground and then a capacitor.
B, in which a speaker of the terminal in series with an inductor, and then to the ground and then a capacitor.
C, the use of the terminal on the two speakers using the method.
D, a capacitor is connected in parallel between the loudspeaker and the contact of the steering wheel.
4, there is a relay electric horn noise, cleaning methods are mainly the following
A, electric horn bracket and body should be in good touch.
B, at the end of the relay contacts, parallel to a capacitor, or in the contact of two separated on the ground in parallel with a capacitor.
5, the ground will be bad noise.
If the front cover does not have a solid grounding, all the front cover will become an antenna, the noise emitted by the various parts of the car to the surrounding space, and from the antenna and the circuit of the introduction of sound system. The front cover and body with connecting line, need to contact the paint, oil, dirt and eliminate.
The engine (engine) and the body, or front wheel suspension, body, between the exhaust pipe and the body should have excellent connection.
6 power line noise restrain:
In order to effectively eliminate the noise of the power line, the device of the power amplifier should be put into the loop. If power amplifier, should be in the neighborhood of each power amplifier are device a Ecuador coil, due to noise energy from a power amplifier transferred to another department, a single order of Ecuador coil failure.
7, the signal line (RCA) to restrain noise:
The signal line should be away from the power line, and power line separation device on either side of the vehicle, thus to prevent the possibility of trouble. If the signal line is a double layer shielding net, the outer shielding net should be connected to the casing.
May face many problems in the use of practice, but the important is to find interference source, and then prescribe the right medicine to deal with it, every car audio system to play shows clear pure and flawless.
Car audio problems, causes the most and is difficult to remove the noise problem, due to the car structure and line is mixed and disorderly, prone to noise of many local, it should be to grasp the knowledge of some car circuit and car audio, troubleshooting abilities are satisfactory.
Cleaning method: first based on the noise situation, through the principle of analysis and identify the fault location of the site, and then adopt a different cleaning methods.
Simple cleaning method, listening to the stereo radio, tapes and CDs and some are not all the noise, if have should check the power line, a ground line and a signal line, go line of site is not reasonable, signal line is loose skin is not break grounding, power amplifier should be and body insulation. For the different noise sources, the adoption of different ways for processing, if noise cannot remove is the noise signal source to dispose of, and then adopted the anti noise measures. In such a way that the go getters from the noise thoroughly dealt with.
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