GSM-noise "buzz" issue

Angus Ainslie angus.ainslie at
Fri Oct 31 22:00:43 CET 2008

On Fri, Oct 31, 2008 at 2:26 PM, Joerg Reisenweber <joerg at>wrote:

> Sorry for any faults or ambiguities! Once again:
> change R4303 (oh-three) [0R, MIC4301:2 to GND] to 2k2
> R4304 (oh-four) is not in the published schem [any more], it's obviously
> been
> replaced in schematics by C4306 [NC, MIC4301:1 to GND]. However you may
> find
> R4304 in component placement diagram (you won't find C4306 there!). It's
> the
> two empty pads left side of the component array left to mic. Symmetric to
> R4303.
> If you want to retrofit C4306 with a huge capacitor, you could use the
> empty
> pads of R4304 to connect it. You also *have* to make the R4303 0->2k2
> change,
> otherwise mic signal is shorted by this capacitor and you won't see decent
> signal on mixer input.
> cheers

That's better. For now I stayed with the 1uF. I might change back to 100uF
on Monday.

While I had the phone open I took a better picture of the bead hack.

Angus Ainslie
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