Am Di 31. März 2009 schrieb Peter Stumm: > Hello, > 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 > http://dl.getdropbox.com/u/845779/neo1.JPG > http://dl.getdropbox.com/u/845779/neo2.JPG > http://dl.getdropbox.com/u/845779/neo3.JPG > http://dl.getdropbox.com/u/845779/neo4.JPG > > can you say me whats wrong? > > thanks > peter
Hi Peter, 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 as well. 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 #openmoko DocScrutinizer HTH good luck /j
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