Capacitor piezoelectric phenomenon

Discussion in 'General Electronics Chat' started by dXri, Sep 8, 2014.

  1. dXri

    Thread Starter New Member

    Oct 4, 2010
    3
    0
    Hello,
    I have designed a PCB which controls the light intensity of a lamp with PWM pulses via a mosfet. My problem is that capacitors makes a buzz noise which occurs from the piezoelectric phenomenon because of the ferroelectric dielectric that have some of the ceramic capacitors (MLCCs). The PWM frequency is 100Hz which is an accoustic frequency (20Hz -20KHz human's accoustic range). My question is if I don't replace the ceramic capacitors into an other type of capacitors (like aluminium capacitors) these ceramic capacitors are going to damaged soon?
     
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