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document updated 15 years ago, on May 11, 2009
writeups:
wikibooks
dontronics
kpsec.freeuk.com
mech.northwestern.edu
Wikipedia
calculator:
[1]
[2]
testers:
[1]
[2]
[3]
explanation of the internals:
[1]
[2]
[3]
modes
Monostable (AKA one shot)
Astable (AKA free running)
Bistable (AKA flip flop)