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What does a capacitor do to an audio signal?
Capacitors are used to separate DC from AC signals — basically bias from audio. They are also used to adjust the frequency response in case it is needed to compensate for imperfections in other devices (e.g. speakers).
Are electrolytic capacitors good for audio?
Electrolytic capacitors are very efficient—they pack a lot of capacitance into a small space, compared to other types. Unfortunately, they also pack a lot of dielectric absorption, ESR, and leakages so they need to be used with discretion in audio circuits.
What three conditions will cause an electrolytic capacitor to fail?
Electrolytic capacitors can fail due to many reasons such as high temperature during soldering, internal power dissipation due to ripple, etc, high ambient temperature, reverse voltage, voltage transients, etc.
Why are electrolytic capacitors used in audio?
Surely the audio signal, which is charging and discharging this capacitor, spends as much time positive as it does negative, and if this is the case, no electrolytic capacitor would be ‘happy’ subjected to these constant reversals of potential across it? Click to expand… Even though this post has been very old.
Why are ceramic capacitors bad for audio path?
We have also found that ceramic capacitors suffer from microphonic effects: the audio passing through the part will actually physically resonate and cause distortion! I would only use ceramic capacitors in the audio path where performance is not an issue, but size and cost are your higher priority.
Which is better electrolytic or polarized capacitors?
Tantalum capacitors are a reasonable alternative, however they are more expensive than electrolytics and are not available in as many values. As polarized capacitors, they must also be biased, however I have not found them to be as linear in an audio path as electrolytic capacitors.
What kind of capacitors are used for AC coupling?
In general, there are 3 types of capacitors that will be available in the values that are appropriate as AC coupling in most signal paths: electrolytic, tantalum and ceramic. Each has strengths and weaknesses.