[sdiy] Eurorack Grounding Question

matt holland matt at mattholland.org
Sun Jan 3 10:32:09 CET 2021


Placing decoupling caps on the bottom side of the board to be as close as
possible is very common.

Hi Brian =)

On Sun, Jan 3, 2021 at 12:11 AM Brian Willoughby <brianw at audiobanshee.com>
wrote:

> I guess this explains why manufacturers are willing to go to the expense
> of mounting parts on the bottom of a board - just to ensure that the caps
> are as close to the power pins as possible. I'm speaking of surface mount,
> of course.
>
> Brian
>
> p.s. Did Texas Instruments buy ComLinear? There's an Application Report
> from TI about the ComLinear Corporation high bandwidth op-amps.
>
>
> On Jan 2, 2021, at 22:04, Michael E Caloroso <mec.forumreader at gmail.com>
> wrote:
> > My first job out of college was designing test programs and test
> > fixtures for automated test equipment.
> >
> > There was a stash of memory components that had failed test.  The
> > original engineer could never resolve those failures.
> >
> > When I examined the test fixture, I modified it by moving the bypass
> > cap as close as possible to the device.  It was about a one centimeter
> > move.
> >
> > That cured the problem, and all the "failed" components now passed.
> > The original engineer had trouble accepting that solution.  The
> > program managers were more than happy to deliver those components
> > regardless of his reservations.  These were for the military and I
> > never heard any customer complaints.
> >
> > My very first ATE assignment with that group was to design a test
> > fixture for a buffer with a 1000V/us slew rate (NS LH0033).  The ATE
> > couldn't generate a step that fast so I had to build a step generator
> > on the fixture.  Wound up using a ComLinear CLC205 in comparator mode,
> > still have one.
> >
> > MC
>
>
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