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Pop noise from headphone speaker

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deepsetan

deepsetan

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Hi,

Today i found that one of my headphone speaker produced a small pop sound during turn off. I did measure the signal of speaker using oscilloscope and during turn off,there is a slightly peak value. Where this pop noise comes from?
 

Hi,

Headphone amplifier, series capacitor at the output, charge/discharge.

Klaus
 

Thanks KlausST! I already change it into bigger capacitor and it works! Actually I found that this headphone have a small mic put near to the output speaker. I guess this is the feedback mic since it is a noise cancelling headphone. When i closed/pressed the earpad using a flat metal,it produced a howling sound. I removed the mic and measure its gain and phase using FFT and found nothing abnormal. I guess maybe the position of the mic is not so good or not stable. Is that correct?
 

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