Grounding in car audio conversion is an extremely important issue, ground and electricity (signal), which is a pair of inseparable twins. Grounding, usually refers to the use of a conductor to connect to the earth. The ground in electronic technology may not be related to the earth, it is only an equipotential surface in the circuit. Such as the radio, the ground in the TV, it is just a potential reference point in the Receiver line. Grounding, in electronics, is both simple and complex, and essential. According to the role of grounding, it can be divided into working grounding, protective grounding, overvoltage protection grounding, anti-static grounding, shielding grounding, signal ground and so on. In the radio and television technology, the above grounding types will be encountered. Now, some grounding technical problems will be explained in combination with the actual situation.
one. <br> protective earthing protective grounding protective device to prevent a reverse polarity power supply damage the equipment provided, the simplest method is to increase reverse power at the input of the diode, particularly automotive audio equipment circuit common.
2. Overvoltage protection grounding <br> This is a grounding protection device for high voltage power. The most widely used anti-spot spark devices are pressure sensitive diodes and bubble. Absorb and limit by grounding. If the high frequency head is damaged, many of them are caused by high voltage intrusion and damage to the receiver. The set Speaker horn high-pitched protection, generally adopts two methods of pressure-sensitive diode and bubble, the best of high-pitched protection is bubble, he absorbs excess power and peak pressure to protect. The disadvantage of pressure sensitivity is that an instantaneous short circuit occurs during absorption, and the high pitch has an instantaneous interruption.
The power supply input terminal has a voltage regulator circuit, and also has an overvoltage protection circuit and an overcurrent protection circuit, and a temperature protection circuit.
III. <br> be shielded to prevent electromagnetic induction metal shell for visual, audio cable shield metal sheath, an electronic device, shield building metallic screen (shielding chamber measured sensitivity, selectivity index) A protective measure for grounding. Among all the grounding, the shielding ground is the most complicated, and there is a kind of unclear and unclear feeling. Because the shielding itself can prevent external interference, and it may interfere with the outside world through it, and electromagnetic interference must also be prevented between the components in the equipment. For example, the well-known mid-circle outer casing and the electron tube shielding cover are examples. Signal line shielding grounding is very important.
Poor shielding and improper grounding can cause interference. These interferences mainly include:
1. AC interference, which is mainly caused by AC power. For protection against AC interference, the power supply is usually filtered or shielded and grounded on the signal line. In addition to large stray electromagnetic fields, it is necessary to shield the ground from electromagnetic interference. For example, the generator will generate electromagnetic field interference, which will also be transmitted to the equipment through the wires, filtering and shielding grounding, thus solving this problem.
2. High frequency interference. This kind of interference comes from the frequency conversion or over-conversion signals of various wireless transmitting stations. After they are broken into the electronic equipment, they are abnormally demodulated in the machine to form audio interference. Such as spark plug ignition, relay contact sparks.
The higher the frequency, the skin effect will occur, the metal mesh eyelet of the device should be smaller, and the braiding of the signal line shielding layer should be denser, otherwise the shielding effect will be lost. For frequently removed signal lines, the shield should be prevented from loosening and falling off at the plug. Because sometimes the shielding of the instrument and equipment is shielded into the ground through the signal line (they are connected through the plug and socket), if the shielding is detached, it is easy to cause interference. If the position of the signal line is related to the interference, sometimes the interference of the signal line shielding layer is not reached by hand, indicating that the high-frequency signal interference forms a distributed capacitive coupling.
4. Signal Ground <br> Various electronic circuits have a reference potential point, which is the signal ground. Its role is to ensure that the circuit has a uniform reference potential, which will not cause floating and cause signal errors.
The connection of the signal ground is: the signal input end of the same device cannot be connected with the signal output end, but should be separated; the output ground of the front stage (device) is only connected to the input ground of the latter stage (device). Otherwise, the signal may form feedback through the ground, causing the signal to float. In the test of the device, the connection of the signal ground is particularly noticeable. For example, the signal wire is broken and the iron is broken. It turns out that the signal is passed through and the results are inconsistent. Some amplifier housings cannot be grounded directly, and all such grounded points are not grounded. This noise phenomenon is gone.
Fives. Car audio special grounding <br> Many vehicles equipped with amplifiers play a large volume of bass (no more than normal power consumption), the instrument light flashes with the music, this is because only the positive line of the amplifier is thickened and the negative is ignored. Line, the formation of the circuit from positive to negative is to have a loop, the positive electrode and then the thick negative electrode can not increase the current, as the water pipe thickness uneven water flow can only be a fine flow. Therefore, it is necessary to increase the amount of current in the negative electrode.
1. The engine is connected to the negative pole of the battery (the engine is insulated from the body).
2. One engine to the body (increased power generation). The line thickness must be at least the same as the positive line.
Grounding in car audio conversion is an extremely important issue, ground and electricity (signal), which is a pair of inseparable twins. Grounding, usually refers to the use of a conductor to connect to the earth. The ground in electronic technology may not be related to the earth, it is only an equipotential surface in the circuit. Such as the radio, the ground in the TV, it is just a potential reference point in the receiver line. Grounding, in electronics, is both simple and complex, and essential. According to the role of grounding, it can be divided into working grounding, protective grounding, overvoltage protection grounding, anti-static grounding, shielding grounding, signal ground and so on. In the radio and television technology, the above grounding types will be encountered. Now, some grounding technical problems will be explained in combination with the actual situation.
one. <br> protective earthing protective grounding protective device to prevent a reverse polarity power supply damage the equipment provided, the simplest method is to increase reverse power at the input of the diode, particularly automotive audio equipment circuit common.
2. Overvoltage protection grounding <br> This is a grounding protection device for high voltage power. The most widely used anti-spot spark devices are pressure sensitive diodes and bubble. Absorb and limit by grounding. If the high frequency head is damaged, many of them are caused by high voltage intrusion and damage to the receiver. The set speaker horn high-pitched protection, generally adopts two methods of pressure-sensitive diode and bubble, the best of high-pitched protection is bubble, he absorbs excess power and peak pressure to protect. The disadvantage of pressure sensitivity is that an instantaneous short circuit occurs during absorption, and the high pitch has an instantaneous interruption.
The power supply input terminal has a voltage regulator circuit, and also has an overvoltage protection circuit and an overcurrent protection circuit, and a temperature protection circuit.
III. <br> be shielded to prevent electromagnetic induction metal shell for visual, audio cable shield metal sheath, an electronic device, shield building metallic screen (shielding chamber measured sensitivity, selectivity index) A protective measure for grounding. Among all the grounding, the shielding ground is the most complicated, and there is a kind of unclear and unclear feeling. Because the shielding itself can prevent external interference, and it may interfere with the outside world through it, and electromagnetic interference must also be prevented between the components in the equipment. For example, the well-known mid-circle outer casing and the electron tube shielding cover are examples. Signal line shielding grounding is very important.
Poor shielding and improper grounding can cause interference. These interferences mainly include:
1. AC interference, which is mainly caused by AC power. For protection against AC interference, the power supply is usually filtered or shielded and grounded on the signal line. In addition to large stray electromagnetic fields, it is necessary to shield the ground from electromagnetic interference. For example, the generator will generate electromagnetic field interference, which will also be transmitted to the equipment through the wires, filtering and shielding grounding, thus solving this problem.
2. High frequency interference. This kind of interference comes from the frequency conversion or over-conversion signals of various wireless transmitting stations. After they are broken into the electronic equipment, they are abnormally demodulated in the machine to form audio interference. Such as spark plug ignition, relay contact sparks.
The higher the frequency, the skin effect will occur, the metal mesh eyelet of the device should be smaller, and the braiding of the signal line shielding layer should be denser, otherwise the shielding effect will be lost. For frequently removed signal lines, the shield should be prevented from loosening and falling off at the plug. Because sometimes the shielding of the instrument and equipment is shielded into the ground through the signal line (they are connected through the plug and socket), if the shielding is detached, it is easy to cause interference. If the position of the signal line is related to the interference, sometimes the interference of the signal line shielding layer is not reached by hand, indicating that the high-frequency signal interference forms a distributed capacitive coupling.
4. Signal Ground <br> Various electronic circuits have a reference potential point, which is the signal ground. Its role is to ensure that the circuit has a uniform reference potential, which will not cause floating and cause signal errors.
The connection of the signal ground is: the signal input end of the same device cannot be connected with the signal output end, but should be separated; the output ground of the front stage (device) is only connected to the input ground of the latter stage (device). Otherwise, the signal may form feedback through the ground, causing the signal to float. In the test of the device, the connection of the signal ground is particularly noticeable. For example, the signal wire is broken and the iron is broken. It turns out that the signal is passed through and the results are inconsistent. Some amplifier housings cannot be grounded directly, and all such grounded points are not grounded. This noise phenomenon is gone.
Fives. Car audio special grounding <br> Many vehicles equipped with amplifiers play a large volume of bass (no more than normal power consumption), the instrument light flashes with the music, this is because only the positive line of the amplifier is thickened and the negative is ignored. Line, the formation of the circuit from positive to negative is to have a loop, the positive electrode and then the thick negative electrode can not increase the current, as the water pipe thickness uneven water flow can only be a fine flow. Therefore, it is necessary to increase the amount of current in the negative electrode.
1. The engine is connected to the negative pole of the battery (the engine is insulated from the body).
2. One engine to the body (increased power generation). The line thickness must be at least the same as the positive line.
Grounding in car audio conversion is an extremely important issue, ground and electricity (signal), which is a pair of inseparable twins. Grounding, usually refers to the use of a conductor to connect to the earth. The ground in electronic technology may not be related to the earth, it is only an equipotential surface in the circuit. Such as the radio, the ground in the TV, it is just a potential reference point in the receiver line. Grounding, in electronics, is both simple and complex, and essential. According to the role of grounding, it can be divided into working grounding, protective grounding, overvoltage protection grounding, anti-static grounding, shielding grounding, signal ground and so on. In the radio and television technology, the above grounding types will be encountered. Now, some grounding technical problems will be explained in combination with the actual situation.
one. <br> protective earthing protective grounding protective device to prevent a reverse polarity power supply damage the equipment provided, the simplest method is to increase reverse power at the input of the diode, particularly automotive audio equipment circuit common.
2. Overvoltage protection grounding <br> This is a grounding protection device for high voltage power. The most widely used anti-spot spark devices are pressure sensitive diodes and bubble. Absorb and limit by grounding. If the high frequency head is damaged, many of them are caused by high voltage intrusion and damage to the receiver. The set speaker horn high-pitched protection, generally adopts two methods of pressure-sensitive diode and bubble, the best of high-pitched protection is bubble, he absorbs excess power and peak pressure to protect. The disadvantage of pressure sensitivity is that an instantaneous short circuit occurs during absorption, and the high pitch has an instantaneous interruption.
The power supply input terminal has a voltage regulator circuit, and also has an overvoltage protection circuit and an overcurrent protection circuit, and a temperature protection circuit.
III. <br> be shielded to prevent electromagnetic induction metal shell for visual, audio cable shield metal sheath, an electronic device, shield building metallic screen (shielding chamber measured sensitivity, selectivity index) A protective measure for grounding. Among all the grounding, the shielding ground is the most complicated, and there is a kind of unclear and unclear feeling. Because the shielding itself can prevent external interference, and it may interfere with the outside world through it, and electromagnetic interference must also be prevented between the components in the equipment. For example, the well-known mid-circle outer casing and the electron tube shielding cover are examples. Signal line shielding grounding is very important.
Poor shielding and improper grounding can cause interference. These interferences mainly include:
1. AC interference, which is mainly caused by AC power. For protection against AC interference, the power supply is usually filtered or shielded and grounded on the signal line. In addition to large stray electromagnetic fields, it is necessary to shield the ground from electromagnetic interference. For example, the generator will generate electromagnetic field interference, which will also be transmitted to the equipment through the wires, filtering and shielding grounding, thus solving this problem.
2. High frequency interference. This kind of interference comes from the frequency conversion or over-conversion signals of various wireless transmitting stations. After they are broken into the electronic equipment, they are abnormally demodulated in the machine to form audio interference. Such as spark plug ignition, relay contact sparks.
The higher the frequency, the skin effect will occur, the metal mesh eyelet of the device should be smaller, and the braiding of the signal line shielding layer should be denser, otherwise the shielding effect will be lost. For frequently removed signal lines, the shield should be prevented from loosening and falling off at the plug. Because sometimes the shielding of the instrument and equipment is shielded into the ground through the signal line (they are connected through the plug and socket), if the shielding is detached, it is easy to cause interference. If the position of the signal line is related to the interference, sometimes the interference of the signal line shielding layer is not reached by hand, indicating that the high-frequency signal interference forms a distributed capacitive coupling.
4. Signal Ground <br> Various electronic circuits have a reference potential point, which is the signal ground. Its role is to ensure that the circuit has a uniform reference potential, which will not cause floating and cause signal errors.
The connection of the signal ground is: the signal input end of the same device cannot be connected with the signal output end, but should be separated; the output ground of the front stage (device) is only connected to the input ground of the latter stage (device). Otherwise, the signal may form feedback through the ground, causing the signal to float. In the test of the device, the connection of the signal ground is particularly noticeable. For example, the signal wire is broken and the iron is broken. It turns out that the signal is passed through and the results are inconsistent. Some amplifier housings cannot be grounded directly, and all such grounded points are not grounded. This noise phenomenon is gone.
Fives. Car audio special grounding <br> Many vehicles equipped with amplifiers play a large volume of bass (no more than normal power consumption), the instrument light flashes with the music, this is because only the positive line of the amplifier is thickened and the negative is ignored. Line, the formation of the circuit from positive to negative is to have a loop, the positive electrode and then the thick negative electrode can not increase the current, as the water pipe thickness uneven water flow can only be a fine flow. Therefore, it is necessary to increase the amount of current in the negative electrode.
1. The engine is connected to the negative pole of the battery (the engine is insulated from the body).
2. One engine to the body (increased power generation). The line thickness must be at least the same as the positive line.
one. <br> protective earthing protective grounding protective device to prevent a reverse polarity power supply damage the equipment provided, the simplest method is to increase reverse power at the input of the diode, particularly automotive audio equipment circuit common.
2. Overvoltage protection grounding <br> This is a grounding protection device for high voltage power. The most widely used anti-spot spark devices are pressure sensitive diodes and bubble. Absorb and limit by grounding. If the high frequency head is damaged, many of them are caused by high voltage intrusion and damage to the receiver. The set Speaker horn high-pitched protection, generally adopts two methods of pressure-sensitive diode and bubble, the best of high-pitched protection is bubble, he absorbs excess power and peak pressure to protect. The disadvantage of pressure sensitivity is that an instantaneous short circuit occurs during absorption, and the high pitch has an instantaneous interruption.
The power supply input terminal has a voltage regulator circuit, and also has an overvoltage protection circuit and an overcurrent protection circuit, and a temperature protection circuit.
III. <br> be shielded to prevent electromagnetic induction metal shell for visual, audio cable shield metal sheath, an electronic device, shield building metallic screen (shielding chamber measured sensitivity, selectivity index) A protective measure for grounding. Among all the grounding, the shielding ground is the most complicated, and there is a kind of unclear and unclear feeling. Because the shielding itself can prevent external interference, and it may interfere with the outside world through it, and electromagnetic interference must also be prevented between the components in the equipment. For example, the well-known mid-circle outer casing and the electron tube shielding cover are examples. Signal line shielding grounding is very important.
Poor shielding and improper grounding can cause interference. These interferences mainly include:
1. AC interference, which is mainly caused by AC power. For protection against AC interference, the power supply is usually filtered or shielded and grounded on the signal line. In addition to large stray electromagnetic fields, it is necessary to shield the ground from electromagnetic interference. For example, the generator will generate electromagnetic field interference, which will also be transmitted to the equipment through the wires, filtering and shielding grounding, thus solving this problem.
2. High frequency interference. This kind of interference comes from the frequency conversion or over-conversion signals of various wireless transmitting stations. After they are broken into the electronic equipment, they are abnormally demodulated in the machine to form audio interference. Such as spark plug ignition, relay contact sparks.
The higher the frequency, the skin effect will occur, the metal mesh eyelet of the device should be smaller, and the braiding of the signal line shielding layer should be denser, otherwise the shielding effect will be lost. For frequently removed signal lines, the shield should be prevented from loosening and falling off at the plug. Because sometimes the shielding of the instrument and equipment is shielded into the ground through the signal line (they are connected through the plug and socket), if the shielding is detached, it is easy to cause interference. If the position of the signal line is related to the interference, sometimes the interference of the signal line shielding layer is not reached by hand, indicating that the high-frequency signal interference forms a distributed capacitive coupling.
4. Signal Ground <br> Various electronic circuits have a reference potential point, which is the signal ground. Its role is to ensure that the circuit has a uniform reference potential, which will not cause floating and cause signal errors.
The connection of the signal ground is: the signal input end of the same device cannot be connected with the signal output end, but should be separated; the output ground of the front stage (device) is only connected to the input ground of the latter stage (device). Otherwise, the signal may form feedback through the ground, causing the signal to float. In the test of the device, the connection of the signal ground is particularly noticeable. For example, the signal wire is broken and the iron is broken. It turns out that the signal is passed through and the results are inconsistent. Some amplifier housings cannot be grounded directly, and all such grounded points are not grounded. This noise phenomenon is gone.
Fives. Car audio special grounding <br> Many vehicles equipped with amplifiers play a large volume of bass (no more than normal power consumption), the instrument light flashes with the music, this is because only the positive line of the amplifier is thickened and the negative is ignored. Line, the formation of the circuit from positive to negative is to have a loop, the positive electrode and then the thick negative electrode can not increase the current, as the water pipe thickness uneven water flow can only be a fine flow. Therefore, it is necessary to increase the amount of current in the negative electrode.
1. The engine is connected to the negative pole of the battery (the engine is insulated from the body).
2. One engine to the body (increased power generation). The line thickness must be at least the same as the positive line.
Grounding in car audio conversion is an extremely important issue, ground and electricity (signal), which is a pair of inseparable twins. Grounding, usually refers to the use of a conductor to connect to the earth. The ground in electronic technology may not be related to the earth, it is only an equipotential surface in the circuit. Such as the radio, the ground in the TV, it is just a potential reference point in the receiver line. Grounding, in electronics, is both simple and complex, and essential. According to the role of grounding, it can be divided into working grounding, protective grounding, overvoltage protection grounding, anti-static grounding, shielding grounding, signal ground and so on. In the radio and television technology, the above grounding types will be encountered. Now, some grounding technical problems will be explained in combination with the actual situation.
one. <br> protective earthing protective grounding protective device to prevent a reverse polarity power supply damage the equipment provided, the simplest method is to increase reverse power at the input of the diode, particularly automotive audio equipment circuit common.
2. Overvoltage protection grounding <br> This is a grounding protection device for high voltage power. The most widely used anti-spot spark devices are pressure sensitive diodes and bubble. Absorb and limit by grounding. If the high frequency head is damaged, many of them are caused by high voltage intrusion and damage to the receiver. The set speaker horn high-pitched protection, generally adopts two methods of pressure-sensitive diode and bubble, the best of high-pitched protection is bubble, he absorbs excess power and peak pressure to protect. The disadvantage of pressure sensitivity is that an instantaneous short circuit occurs during absorption, and the high pitch has an instantaneous interruption.
The power supply input terminal has a voltage regulator circuit, and also has an overvoltage protection circuit and an overcurrent protection circuit, and a temperature protection circuit.
III. <br> be shielded to prevent electromagnetic induction metal shell for visual, audio cable shield metal sheath, an electronic device, shield building metallic screen (shielding chamber measured sensitivity, selectivity index) A protective measure for grounding. Among all the grounding, the shielding ground is the most complicated, and there is a kind of unclear and unclear feeling. Because the shielding itself can prevent external interference, and it may interfere with the outside world through it, and electromagnetic interference must also be prevented between the components in the equipment. For example, the well-known mid-circle outer casing and the electron tube shielding cover are examples. Signal line shielding grounding is very important.
Poor shielding and improper grounding can cause interference. These interferences mainly include:
1. AC interference, which is mainly caused by AC power. For protection against AC interference, the power supply is usually filtered or shielded and grounded on the signal line. In addition to large stray electromagnetic fields, it is necessary to shield the ground from electromagnetic interference. For example, the generator will generate electromagnetic field interference, which will also be transmitted to the equipment through the wires, filtering and shielding grounding, thus solving this problem.
2. High frequency interference. This kind of interference comes from the frequency conversion or over-conversion signals of various wireless transmitting stations. After they are broken into the electronic equipment, they are abnormally demodulated in the machine to form audio interference. Such as spark plug ignition, relay contact sparks.
The higher the frequency, the skin effect will occur, the metal mesh eyelet of the device should be smaller, and the braiding of the signal line shielding layer should be denser, otherwise the shielding effect will be lost. For frequently removed signal lines, the shield should be prevented from loosening and falling off at the plug. Because sometimes the shielding of the instrument and equipment is shielded into the ground through the signal line (they are connected through the plug and socket), if the shielding is detached, it is easy to cause interference. If the position of the signal line is related to the interference, sometimes the interference of the signal line shielding layer is not reached by hand, indicating that the high-frequency signal interference forms a distributed capacitive coupling.
4. Signal Ground <br> Various electronic circuits have a reference potential point, which is the signal ground. Its role is to ensure that the circuit has a uniform reference potential, which will not cause floating and cause signal errors.
The connection of the signal ground is: the signal input end of the same device cannot be connected with the signal output end, but should be separated; the output ground of the front stage (device) is only connected to the input ground of the latter stage (device). Otherwise, the signal may form feedback through the ground, causing the signal to float. In the test of the device, the connection of the signal ground is particularly noticeable. For example, the signal wire is broken and the iron is broken. It turns out that the signal is passed through and the results are inconsistent. Some amplifier housings cannot be grounded directly, and all such grounded points are not grounded. This noise phenomenon is gone.
Fives. Car audio special grounding <br> Many vehicles equipped with amplifiers play a large volume of bass (no more than normal power consumption), the instrument light flashes with the music, this is because only the positive line of the amplifier is thickened and the negative is ignored. Line, the formation of the circuit from positive to negative is to have a loop, the positive electrode and then the thick negative electrode can not increase the current, as the water pipe thickness uneven water flow can only be a fine flow. Therefore, it is necessary to increase the amount of current in the negative electrode.
1. The engine is connected to the negative pole of the battery (the engine is insulated from the body).
2. One engine to the body (increased power generation). The line thickness must be at least the same as the positive line.
Grounding in car audio conversion is an extremely important issue, ground and electricity (signal), which is a pair of inseparable twins. Grounding, usually refers to the use of a conductor to connect to the earth. The ground in electronic technology may not be related to the earth, it is only an equipotential surface in the circuit. Such as the radio, the ground in the TV, it is just a potential reference point in the receiver line. Grounding, in electronics, is both simple and complex, and essential. According to the role of grounding, it can be divided into working grounding, protective grounding, overvoltage protection grounding, anti-static grounding, shielding grounding, signal ground and so on. In the radio and television technology, the above grounding types will be encountered. Now, some grounding technical problems will be explained in combination with the actual situation.
one. <br> protective earthing protective grounding protective device to prevent a reverse polarity power supply damage the equipment provided, the simplest method is to increase reverse power at the input of the diode, particularly automotive audio equipment circuit common.
2. Overvoltage protection grounding <br> This is a grounding protection device for high voltage power. The most widely used anti-spot spark devices are pressure sensitive diodes and bubble. Absorb and limit by grounding. If the high frequency head is damaged, many of them are caused by high voltage intrusion and damage to the receiver. The set speaker horn high-pitched protection, generally adopts two methods of pressure-sensitive diode and bubble, the best of high-pitched protection is bubble, he absorbs excess power and peak pressure to protect. The disadvantage of pressure sensitivity is that an instantaneous short circuit occurs during absorption, and the high pitch has an instantaneous interruption.
The power supply input terminal has a voltage regulator circuit, and also has an overvoltage protection circuit and an overcurrent protection circuit, and a temperature protection circuit.
III. <br> be shielded to prevent electromagnetic induction metal shell for visual, audio cable shield metal sheath, an electronic device, shield building metallic screen (shielding chamber measured sensitivity, selectivity index) A protective measure for grounding. Among all the grounding, the shielding ground is the most complicated, and there is a kind of unclear and unclear feeling. Because the shielding itself can prevent external interference, and it may interfere with the outside world through it, and electromagnetic interference must also be prevented between the components in the equipment. For example, the well-known mid-circle outer casing and the electron tube shielding cover are examples. Signal line shielding grounding is very important.
Poor shielding and improper grounding can cause interference. These interferences mainly include:
1. AC interference, which is mainly caused by AC power. For protection against AC interference, the power supply is usually filtered or shielded and grounded on the signal line. In addition to large stray electromagnetic fields, it is necessary to shield the ground from electromagnetic interference. For example, the generator will generate electromagnetic field interference, which will also be transmitted to the equipment through the wires, filtering and shielding grounding, thus solving this problem.
2. High frequency interference. This kind of interference comes from the frequency conversion or over-conversion signals of various wireless transmitting stations. After they are broken into the electronic equipment, they are abnormally demodulated in the machine to form audio interference. Such as spark plug ignition, relay contact sparks.
The higher the frequency, the skin effect will occur, the metal mesh eyelet of the device should be smaller, and the braiding of the signal line shielding layer should be denser, otherwise the shielding effect will be lost. For frequently removed signal lines, the shield should be prevented from loosening and falling off at the plug. Because sometimes the shielding of the instrument and equipment is shielded into the ground through the signal line (they are connected through the plug and socket), if the shielding is detached, it is easy to cause interference. If the position of the signal line is related to the interference, sometimes the interference of the signal line shielding layer is not reached by hand, indicating that the high-frequency signal interference forms a distributed capacitive coupling.
4. Signal Ground <br> Various electronic circuits have a reference potential point, which is the signal ground. Its role is to ensure that the circuit has a uniform reference potential, which will not cause floating and cause signal errors.
The connection of the signal ground is: the signal input end of the same device cannot be connected with the signal output end, but should be separated; the output ground of the front stage (device) is only connected to the input ground of the latter stage (device). Otherwise, the signal may form feedback through the ground, causing the signal to float. In the test of the device, the connection of the signal ground is particularly noticeable. For example, the signal wire is broken and the iron is broken. It turns out that the signal is passed through and the results are inconsistent. Some amplifier housings cannot be grounded directly, and all such grounded points are not grounded. This noise phenomenon is gone.
Fives. Car audio special grounding <br> Many vehicles equipped with amplifiers play a large volume of bass (no more than normal power consumption), the instrument light flashes with the music, this is because only the positive line of the amplifier is thickened and the negative is ignored. Line, the formation of the circuit from positive to negative is to have a loop, the positive electrode and then the thick negative electrode can not increase the current, as the water pipe thickness uneven water flow can only be a fine flow. Therefore, it is necessary to increase the amount of current in the negative electrode.
1. The engine is connected to the negative pole of the battery (the engine is insulated from the body).
2. One engine to the body (increased power generation). The line thickness must be at least the same as the positive line.
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