Re: Another Zip story, episode 2...

[o9938156@wsuaix.csc.wsu.edu (mark lyon)]

toddpw@lust.ugcs.caltech.edu (Todd P. Whitesel) writes:
: 
: Huge electrolytics are useless for what Jawaid was talking about.
: Try .1uF/.01uF/.001uF caps on the SRAMs and see if that helps.

I did try a .68uF, but for this application, I can't see why
small caps would succeed where big ones fail.  You're just 
filtering a power supply, and a big cap would be more effective
at filtering.  It would filter lower frequencies as well as higher
ones.
: 
: And the shield's capacitance is very small; small caps are what you want
: for noise. Large caps are good for preventing major power spikes, but

Unless the spike goes above the cap's rated voltage :)

: the Zip board (and any good Apple card) already has some.
: 
: Todd Whitesel
: toddpw @ ugcs.caltech.edu