GSM-noise "buzz" issue

Andy Green andy at
Mon Sep 29 09:53:23 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:
| I wrote:
|> 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.
| Did you try it ? Joerg has suggested that this experiment may actually
| be quite promising. So what's a wasted EUR 1 component compared to the
| possibility of eternal fame ? ;-)
| Oh ... Andy, did you try a shorted headset plug ? Given that you're
| one of the lucky few in Openmoko who can actually reproduce the
| buzz ...

I am currently under a crapstorm of stuff that all needs doing at once,
so not yet.  But I will meet Uwe this week if we can figure it out.

- -Andy
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