Bill Sudbrink wrote:
http://www.technology.niagarac.on.ca/people/mcsele/images/SA400Disk1.jpg
You want to look at "Figure #3". I've used several different image
processing
programs, but I can't get the scribble next to the cap legible. I've looked
at the data sheet for the chip, but I don't know enough for an obvious value
to jump out at me. Part of the accompanying text says: "The RC time
constant
is adjusted to give an output pulse width on pin#1 of the 74LS121 of 5.5
ls."
I assume "ls" is an oddball abbreviation for microsecond?
Well - the spec for the LS121 is pretty well-known. Someone with more
caffeine and inclination than I might well look up the datasheet and
work out what the value ought to be. It looks like it says "270"
overscribbled with "220" to me - what units I don't know. Try 220nF.
If that doesn't work, try 220pF. You'll be in the ballpark with one of
those.
Then, y'see, the phrase is "select on test".
Gordon.