[sdiy] dare I say - decoupling?

[harrybissell]

sorry, Dad....

(hangs head in shame)   ;^P

H^) harry un-laden

Peter Grenader wrote:

> Guys...please.  WHAT does all this have to do with the flight velocity of an
> unladen swallow?  Can we please keep this on-topic.
>
> - P
>
> harrybissell wrote:
>
> > James Patchell wrote:
> >
> >> Harry likes to use the analogy of "Ground == Ocean"....very important
> >> here...In general, you do not need a ground plane.  But when things don't
> >> seem to be working they way they should...well...
> >>
> >
> > Yes... I do.   If you pour a cup of water into the North Atlantic Ocean...
> > does the water level rise ?   Of COURSE it does... but probably not enough to
> > notice or care.   Does the water level rise in England (I'm going to pour from
> > Boston in this case :^) ?  Yes it does... but it takes time for the change in
> > sea
> > level to even out. They will notice the rise much later.
> >
> > What about if I pour the cup of water into a shotglass ??? Does the water
> > level
> > rise ?
> > Yes. Do I notice ???  Probably... unless I had been using that shotglass for
> > hours
> > :^P
> >
> > You think of supply rails like pipes carrying current to the circuit... well
> > ground
> > is
> > like sewer pipes draining that current.  If any of the pipes are too small,
> > the
> > water
> > pressure drops when you open a valve.  AND it takes time for the water to flow
> > from
> >
> > the source to where that pressure drop is.
> >
> > Decoupling caps will act as local sources of 'water'... helping to hold the
> > pressure
> > steady with changing demand AND acting as a reservoir ... until the rains come
> > again
> > (from the main filter caps, through the resistance and inductance of the
> > supply
> > 'pipes')
> >
> > This is why some "Harley Engineers" like myself and twin-separated-at-birth
> > Jim
> > Patchell use LOTS of decoupling caps, probably MUCH more than we really need
> > to.
> > They are not real expensive... cheap insurance.
> >
> > A Harley Davidson engineer was quoted as saying "At Harley-Davidson... if we
> > need
> > to make something stronger, we make it BIGGER. If that makes it ugly...we
> > CHROME
> > it"
> >
> > H^) harry
> >