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[SOLVED] Replace polyester film capacitor by MLCC in audio circuit

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ysba

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Hi,

I want to make a SMD version of an audio circuit.

In the original circuit, all capacitors are polyester film, through hole.

What I want to know is if the circuit performance can be degraded if I replace these caps by MLCC (multilayer ceramic capacitor) SMD ones.

Has anyone experience in doing something like that?

Thanks!
 

It really depends on what the capacitor does in the circuit. For signal decoupling and filtering they are probably fine to use but they tend to produce a tiny voltage of their own when vibrated or flexed so in high gain stages you might find they introduce unwanted sound effects.

Brian.
 
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In addition to being microphonic which might even cause acoustical feedback howling if the circuit is inside a speaker enclosure), a ceramic coupling capacitor causes distortion of low frequencies because its value changes with voltage changes of the signal.
 
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Ceramic may be used as long as distortion is low since C can vary depending on ceramic quality type since Ic= V*dC/dt + C * dV/dt distortion where the 1st part is not taught in school as Caps are assumed to be ideal and ceramic changes capacitance with applied voltage and voltage from vibration( monophonic )
Distortion performance must be compared to plastic which are more ideal.

Plastic is available in SMT and is used for high quality designs. Your design may avoid the need for such critical caps depending on levels and impedance.

**broken link removed**
 
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