1. Noise often invades your audio system through the following ways: A. Intrusion into the power cord (into the system through the host and power amplifier power cord). B. Current through the ground wire (through the ground wire of the antenna and the ground wire of the power amplifier). C. Interference from other wires (received through the antenna and interference from the original car line) D. Interference from other electrical appliances (electric horns, generators, etc.). Note: Items A, B, and C are relevant. 2. Countermeasures to deal with car audio noise Generally, the parts used to deal with noise include car audio capacitor
s (especially effective in dealing with high-frequency noise), current loops (inductors), filters, grounding wires, etc., to deal with the noise generated by the ignition system. 1. Check whether the anode of the ignition coil is installed on the capacitor. If the capacity is reduced, the platinum contact is easy to ablate and cause interference sparks. You need to replace the O, 5UF/400V non-polar capacitor, and check whether the ignition high-voltage wire uses carbon fine wire. The metal wire type is prone to interference, because the radio part has serious interference, so it must be replaced. You can increase the local resistance of the resistance to reduce the spark noise. The method is to use a 1 megohm resistor in series with the ignition coil output main high-voltage line to reduce interference. 2. Elimination of motor noise. Firstly, keep the equipment and signal wires of the car audio modification away from the motor and motor wires. One non-polar capacitor can be connected in parallel to the two ends of the motor, or two inductors can be connected in series in the positive and negative wires of the motor. , And then use two non-polar capacitors to connect to the positive and negative lines of the motor, and the other end is grounded to form a filter circuit, which is used to absorb the sparks of the motor carbon brush to reduce noise. 3. For the noise generated by electric horns without relays, there are mainly the following ways to eliminate them: A. Connect a capacitor in parallel to the ground of one of the horn terminals. B. Connect an inductor in series to the terminal of one of the horns, and then connect a capacitor in parallel to the ground. C. Use methods on the terminals of the two speakers respectively. D. Connect a capacitor in parallel between the horn button contacts of the steering wheel. 4. For the noise generated by the electric horn with relay, the main ways to eliminate the noise are as follows: A. The electric horn bracket should be in good contact with the body. B. Connect a capacitor in parallel at both ends of the relay contact, or connect a capacitor in parallel to the ground at both ends of the contact. 5. Poor grounding will produce noise. If the head cover is not firmly grounded, the entire head cover will become an antenna, radiating the noise generated by various parts of the car to the surrounding space, and introducing the audio system from the antenna and various circuits. When installing the connecting line between the front cover and the body, the paint, oil stains, and dirt on the joints must be completely eliminated. There should be a good connection between the engine (engine) and the body, or between the front wheel suspension, the body, and the exhaust pipe and the body. 6. Power cord noise suppression: In order to effectively eliminate the noise generated by the power cord, the circulator should be installed near the power amplifier. If there are multiple power amplifiers, one should be installed near each power amplifier, because noise can be transmitted from one power amplifier to another, so that a single current loop will fail. 7. Suppression of incoming noise from the signal line (RCA): The signal line should be far away from the power line and installed on both sides of the vehicle body separately from the power line, so as to avoid the possibility of interference. If the signal line has a double-layer shielding net, the outer shielding net should be connected to the chassis. There are still many problems encountered in practical applications, but it is important to find the source of interference first, and then prescribe the right medicine to solve it, so that every program played by the car audio system is clear, pure and perfect. The noise problem is the most difficult to eliminate in car audio failures. Because the structure and wiring of the car are more complicated, and there are many places where noise is easy to generate, it is necessary to master some knowledge of car circuits and car audio to troubleshoot the problem. . Elimination method: First, according to the noise situation, find out the location of the fault through principle analysis and judgment, and then adopt different elimination methods. Simple troubleshooting method, first listen to whether there are noises in the radio, tape and CD parts of the audio. If there are noises, check the power line, ground line, signal line, whether the wiring is reasonable, whether the signal line is loose, whether the outer skin is broken or not. , The power amplifier should be insulated from the body. For different noise sources, different measures are taken to deal with it. If the noise cannot be eliminated, the signal source that generates the noise is processed, and then anti-noise measures are taken, so that the noise can be completely resolved. JMX brand capacitors have provided high-quality high-end car audio capacitors to thousands of customers for nearly 20 years. JMX brand capacitors have become one of the most high-quality and honest capacitor suppliers in China. Sincerely welcome friends from all walks of life to visit Shenmao capacitor factory for guidance and business negotiation. Capacitor order hotline: 0755-8527 4135, after-sales customer service:, fax: 0755-8527 6135 Learn about capacitor parameters: WWW.JMXCAP.COM
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