joerg at openmoko.org
Tue Mar 31 23:11:47 CEST 2009
Am Di 31. März 2009 schrieb Peter Stumm:
> a good friend does the buzz fix for me, but after doing that there is
> still a buzz, think it's a little bit quiter.
> here are a few pictures after the buzz
> can you say me whats wrong?
I'm really sorry it didn't work for you on first shot.
The main problem with your fix seems to be the extremely long wires catching
more RF which is creating noise directly in mic, than the whole rework is
reducing noise introduced by MICBIAS ripple.
The recommendations to keep the wires *as short as possible* and run them
*close to PCB (GND) surface* were chosen to avoid exactly this problem.
Probably you should replace the 0603 (0804?) big R4303 by a fitting 0402 and
place this one on the pads directly so no wire is needed to contact it. You
might keep the capacitor but you need to replace this wire with a short one
If you got problems to find correct components don't hesitate to ask me to
send some to you. Contact me either via private mail or on IRC freenode
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