Re: gEDA-user: buzzing board

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

No oled no noise? with oled noise but comming from the board. Could it
be the connector?

On Fri, 2007-09-14 at 14:53 -0400, DJ Delorie wrote:
> > The OLED has noise on it 0.5V.  What frequency?
> 
> Line redraw noise is about 7.8khz, with the waveform dependent on
> what's on the screen.  That's the high pitched whine portion.
> 
> 5.5ms of that noise, followed by 1.5ms of quiet, about 140Hz vertical
> refresh.  That's the buzzing portion.
> 
> > The switchers are opporating at 150KHz.
> > 
> > What frequency is the buzzing?
> 
> Audible :-(
> 
> > Could a capacitor be humming like a tunning fork with respect to one or
> > more of the noise signals?
> 
> I've tried removing, and changing, the bypass cap on that supply rail.
> No change.
> 
> Hmmm... I can try tweaking the refresh period.  As soon as my son is
> done playing video games with my laptop.
> 
> 
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