parts for the buzzfix

Al Johnson openmoko at
Wed Jun 9 16:02:48 CEST 2010

On Wednesday 09 June 2010, Peter Nijs wrote:
> On Wednesday 09 June 2010 15:20:51 Paul Fertser wrote:
> > Peter Nijs <moko_ml at> writes:
> > > find it quite difficult to difficult to find the needed components: 2K2
> > > 0402 smd resistor and a small ceramic 100µF smd cap.
> >
> > It'd be a bit too long for me to send you the parts but i can suggest
> > using 0603 R (it fits there all right because one side of it should be
> > connected to the ground plane anyway.) and a tantalum capacitor, those
> > are much easier to source.
> >
> > HTH
> Thanks for the tips. I already found them on rs-components (and I have
> contacts who can order there). But aren't tantalum cap's polarised? Or is
>  the mic signal DC? Or is there another reason why this isn't a problem?

The cap is smoothing the mic bias supply, and polarised caps are regularly 
used for this purpose. You just have to make sure you put them the right way 
round ;-) In this case the mic bias is +ve.

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