Is Ceramic Capacitors Good I N Audio

The converse piezoelectric effect causes considerable audio signal distortion at lower frequencies and it is a main source of voltage coefficient in class ii ceramic capacitors.

Is ceramic capacitors good i n audio.

In audio amplifiers this variation in the electrical value of a component results in a signal dependent gain change. There are two types of film capacitors film and foil as well as metallized film capacitors. Electrodes in film and foil capacitors are separate sheets of metal foil wound with. However when most ceramic capacitors are biased the capacitive rating can decrease by as much as 50.

I have read such quite good technical articles on ceramic capacitors and capacitors and capacitors generally and although ceramics are excellent in some circuit applications mainly supply rail bypassing they have well documented serious technical limitations when used elsewhere in audio non linearity michrophony etc and certainly having heard their sound for myself i will never use a ceramic capacitor in a straight audio circuit application ever again. Internal ceramic capacitor film capacitors the best choice for music. When the momentary voltage of your bass note is higher a bad ceramic capacitor has a lower value i e. A ceramic capacitor is a fixed value capacitor where the ceramic material acts as the dielectric it is constructed of two or more alternating layers of ceramic and a metal layer acting as the electrodes the composition of the ceramic material defines the electrical behavior and therefore applications.

Basic ceramic capacitor construction figure 6. Only non linear types of ceramics tend to have these. This nonlinear effect leads to audio distortion. For audio applications you will often need large capacitor values.

Here is why you should use polypropylene capacitors in audio coupling circuits. Although ceramic capacitors are commonly used in audio and rf applications they are generally unsuitable for applications that demand superior performance. In film dialectric capacitors the dialectric is some kind of plastic such as mylar or polypropylene. Ceramic capacitors provide a poor audio response.

This dialectric allows a high voltage and long life but at a downside of being relatively large and expensive. This may lead to the higher note becoming damped more strongly. Your high pass filter has a higher cutoff frequency. Ceramic capacitors are generally not recommended for use as ac coupling in audio.

They are attractive because of the size cost and low esr. Some very talented techs on this site will use a ceramic capacitor in audio coupling circuits. There s a good reference to ceramic capacitor markings here.