Application of AVX tantalum capacitor in audio circuit

Tantalum capacitors are made of the rare metal tantalum which is ground into fine powder and sintered together with other media. Due to the inherent characteristics of tantalum metal, tantalum capacitors are of good stability, do not change with the change of the environment, and can achieve large capacitance. In some aspects, tantalum capacitors cannot be compared with ceramic capacitors. Therefore, tantalum capacitors are widely used in many circuits where ceramic capacitors cannot be used.

With the wide application of tantalum capacitors in the market, the increase of models and supply quantity, and the decrease of price, many industries are replacing aluminum electrolytic capacitors with tantalum capacitors. Of course, tantalum capacitors also have their own defects, such as low voltage resistance, which greatly limits the use of tantalum capacitors. Take audio as an example. Audio circuits often contain capacitors such as filter, coupling, bypass and frequency division. How to use capacitors more effectively in the circuit has a great impact on the improvement of audio quality. Tantalum capacitors are mostly used in the coupling capacitors of sound circuits.

The principle of tantalum capacitors is as follows: tantalum is easily oxidized in the air. People use its oxide film as the medium. Because tantalum is easily oxidized, tantalum capacitors have the repair function of "healing wounds" automatically. Because the oxide film is very thin, the tantalum capacitor is very close to the two plates, with few inductive reactance and very sensitive, so the charging and discharging speed is fast. These characteristics determine that tantalum capacitors are suitable for high frequency, low current and circuits requiring rapid response. Therefore, tantalum capacitors are also widely used in circuits requiring rapid response and high reliability such as missiles and satellites. Tantalum capacitors are also used in audio circuits of advanced audio systems due to their sensitivity, rapid charge and discharge. They are mainly used in high audio circuits. Because of their low current loss to high audio, tantalum capacitors have relatively improved high pitch and sound quality.