GSM-noise "buzz" issue

Werner Almesberger werner at
Fri Sep 19 22:57:06 CEST 2008

Florian Zeitz wrote:
> FWIW I have tried something similar. I put a small (100 Ohm IIRC)
> resistor between MIC and GND, that doesn't help at all though. It just
> makes things worth.


> If you think it's more likely to work I can try a
> short everything or a completely different approach (still have two
> 2.5mm jacks lying around) if you want.

I guess it can't hurt to try our luck, even though it seems unlikely
this will help. I'd go for the "short everything" variant. The
amplifier is protected by 33 Ohm resistors R4405 and R4407, so this
should be safe.

- Werner

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