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What is the effect of capacitors on car audio?
As we all know, there are capacitors, resistors, inductors and other electronic components in the passive sound divider of car audio. These three kinds of materials directly affect the performance of speakers. The value of each part is selected according to the original design. To put it more clearly, it is the best sound effect combination in the budget of this product level that the original manufacturer thinks. A capacitor is an element that stores electric quantity and electric energy (electric potential energy). A conductor is surrounded by another conductor, or the electric field lines emitted by one conductor are all terminated in the conductor system of the other conductor, which is called a capacitor. The capacitor (c) forms an LCR frequency dividing line with the resistor (R) and the inductor coil (L) on the sound line. When the output signal of the power amplifier passes through the LCR network, the frequency dividing point originally designed by the Institute will be handled and the high and low frequencies will be separately transmitted to different speakers. LCR network is designed by engineers of various factories, ranging from the simplest two tone channel to the top multi tone channel. The circuit of LCR is also designed by the engineers of each factory. Each audio circuit has from the most basic one capacitor and inductor (first-order frequency division) to multiple capacitors and inductors (multi-order frequency division). Since the theoretical value phase of the signal passes through the capacitor is reversed by 90 degrees (in the case of zero loss of the capacitor, but it is impossible to achieve with the current technology), and the phase of the signal passes through the inductor is advanced by 90 degrees (the resistance is used to reduce the SPL emitted by the monomer and the grounding effect), it is thought that the signal phase will be restored to the original phase, unless different numbers are used as the design of signal phase difference and impedance correction, Generally, the same number of capacitors and inductors must be used for the complete frequency dividing line. Therefore, the importance of the internal parts of the frequency divider to the sound cannot be ignored.
What is the need to install a voltage monitor?
Voltage monitor, or voltage detector, is one of the products of power management integrated circuit ic. Voltage monitor is a statistical voltage monitor that continuously monitors and statistics the voltage deviation caused by the slow change of the normal operation state of power system. It has functions of monitoring, analysis, memory, query, parameter setting, etc. At present, the voltage monitor is developing towards intellectualization, forming a good network management system. However, its power supply system and operating environment are still running in isolation, and its status can not be effectively supervised in the central station. From the operation analysis of substation power system, we find that the equipment power supply system and operation environment have become the key factors that restrict the safe operation of communication and computer network, so it is especially important to centralize real-time monitoring of power supply system operation and environment. 01 Data Acquisition The voltage monitor has the functions of automatically monitoring, displaying and recording the voltage, charging and discharging current of the accumulator group, the voltage of the accumulator unit, the temperature of the unit, the environment temperature and the resistance of the accumulator unit. Through the system, the remote monitoring and management function is implemented, the operating parameters of the accumulator can be viewed in real time, the DC system diagram can be displayed, and the operation data can be displayed intuitively in forms of tables, graphics, and other forms, and the related history can be queried. Voltage monitor monitoring data should be sent to the centralized system for unified processing and interconnected with the communication management system through standard interfaces. Centralized systems, monitoring units, monitoring modules and other communication power monitoring systems should use standard interfaces for data interconnection. 02 Alert Management In the voltage monitor, operation and maintenance personnel can set normal range of monitoring voltage, temperature, internal resistance and other data according to actual needs. When the corresponding alarm appears, the system will inform the responsible person of the alarm information through pager or fax according to the set alarm level and the division of responsibility and authority, so that they can handle it in time. 03 User Management The data server has user management function, can add or delete the list of managers, management rights settings, etc. It should provide different management rights, which can be divided into system administrator, operator, general browser level to ensure the safe operation of the system, with hierarchical login and rights control functions. The voltage monitor is designed with reference to DL500-92, the standard of electric power industry, Technical Conditions for Order of Voltage Monitors. This product uses large-scale programmable logic gate array (GA), high-speed and high-precision D/A converter, through direct digital synthesis (DDS) technology to generate single-phase adjustable frequency, amplitude, tune the signal source, and then amplify the signal by high-power Precision Operational amplifier. The product has built-in high-precision voltage, current, power and time standards, and uses analog closed-loop feedback and digital PID adjustment to automatically and stably track and set parameters for a long time.
What are the product categories of LED drivers?
Led's drive is generally referred to as the Led's Luminous Module Controller, which controls the current. If the control current is not good, the lamp may be damaged. Sometimes the current and voltage can be very unstable, then the driver will play a role. So LED drives are very good to check for damage during use. If it is damaged, it can cause the light to dim or turn off directly, and it can also cause flashes. Led driver is an electronic device that drives the LED light to emit light and work normally. It is equivalent to the heart of the LED lamp. When the driver is in problem, the whole LED lamp will be in problem. Drivers can be categorized (1) Constant current: A. The output current of the constant current drive circuit is constant, but the output DC voltage varies in a certain range with the magnitude of the load resistance value. Load resistance value is small, output voltage is low, and the larger the load resistance value, the higher the output voltage is. B. Constant current circuits are not afraid of short-circuit loading, but full open loading is strictly prohibited. C. Constant current drive circuit for LED is ideal, but relatively expensive. D. Pay attention to the maximum withstanding current and voltage value used, which limits the number of LEDs used. (2) Voltage regulator: A. When the various parameters of the voltage regulator circuit are determined, the output voltage is fixed, but the output current changes with the increase and decrease of the load. B. The voltage regulator circuit is not afraid of load opening, but it is strictly forbidden to completely short-circuit the load. C. Drive the LED with a regulator-driven circuit, each string needs to be added with a suitable resistor to make each LED display brightness average; D. The brightness will be affected by the voltage change coming from the rectifier.
What are the advantages and functions of CBB film capacitors
The so-called CBB capacitor, we usually refer to the capacitor mainly made from metallized polypropylene film. There are many kinds of capacitors, such as CBB21, CBB22, CBB20, CBB81, CBB13, MMKP82, CBB60, etc. What are the advantages of CBB film capacitor and what are its common functions? Koya's short edition will popularize some relevant knowledge. So what are the common CBB capacitors? CBB20 axial capacitor, generally with flat circular or cylindrical appearance, is a kind of capacitor using metallized polypropylene film as dielectric and electrodes, wrapped with flame retardant tape and sealed with epoxy resin. It is suitable for AC and DC circuits of instruments, instrumentation, household appliances, etc. It is widely used in crossover lines of audio systems. For example, axial capacitors are often used in many microphones and audio systems, and also in some ultrasonic masks. CBB21 and CBB22 metallized polypropylene film capacitors. CBB21 is different from CBB22 in the past. CBB21 cannot be used in high frequency circuits, but now material technology has made great progress. CBB21 and CBB22 capacitors have no difference. This is a film capacitor with metallized polypropylene film as dielectric and electrode, epoxy resin sealed film capacitor, and also a film capacitor with the largest usage in film capacitor. CBB22 thin film capacitor, CBB21/22 capacitor usage is particularly large, it is widely used in instruments, instrumentation, TV and home appliances lines for DC pulse, pulse, and AC voltage reduction, especially for various types of energy-saving lamps and electronic rectifiers. MMKP82 capacitor, MMKP82 is a double-sided metallized polypropylene film capacitor, because it uses double-sided steamed film, so it has smaller volume than CBB81 capacitor, the two functions are exactly the same, but the capacity of MMKP82 is smaller, more resistant to high temperature and humidity environment.
What is the effect of capacitors on car audio?
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