General knowledge of audio capacitors|Focus on mid-to-high-end brand capacitor manufacturers

Various capacitors are needed in electronic production, and they play different roles in the circuit. Similar to a resistor, it is usually referred to as a capacitor for short and is represented by the letter C. As the name suggests, a capacitor is a 'container for storing electric charge.' Although there are many types of capacitors, their basic structure and principles are the same. Two pieces of metal that are very close together are separated by a substance (solid, gas or liquid) to form a capacitor. The two pieces of metal are called plates, and the substance in the middle is called the medium. Capacitors are also divided into fixed capacity and variable capacity. But the common ones are fixed-capacity capacitors, and the most common ones are electrolytic capacitors and ceramic capacitors. Different capacitors have different capacities for storing charge. It is stipulated that the amount of charge stored when a capacitor is applied with a 1 volt DC voltage is called the capacitance of the capacitor. The basic unit of capacitance is farad (F). But in fact, farad is a very uncommon unit, because the capacity of capacitors is often much smaller than 1 farad, commonly used microfarad (μF), nanofarad (nF), picofarad (pF) (picofarad is also called picofarad) ) And so on, their relationship is: 1 farad (F) u003d 1000000 microfarads (μF) 1 microfarad (μF) u003d 1000 nanofarads (nF) u003d 1000000 picofarads (pF) In electronic circuits, capacitors are used to pass AC And blocking direct current is also used to store and release charge to act as a filter to smooth out the pulsating signal. Small-capacity capacitors are usually used in high-frequency circuits, such as radios, transmitters, and oscillators. Large-capacity capacitors are often used for filtering and storing charges. And there is another feature. Generally, capacitors above 1μF are electrolytic capacitors, while capacitors below 1μF are mostly ceramic capacitors. Of course, there are others, such as monolithic capacitors, polyester capacitors, and small-capacity mica capacitors. Electrolytic capacitors have an aluminum shell filled with electrolyte and lead out two electrodes as positive (+) and negative (-) poles. Unlike other capacitors, they cannot be connected to the wrong polarity in the circuit, while other capacitors are There is no polarity.

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