Re: How inaccurate is a 555 or 7555 REALLY?

..002% would be good enough for me.... but i don't know where to find
examples
on making a tiny quartz crystal divide down to 420hz in a tiny package
(I don't have more than about 3/4" box to fit things into.) or any
other component
oscillators that can reach 420hz with the least number of components.

Any basic circuit diagrams online that someone can point me to would
be greatly appreciated! Sine wave output preferred, but I think square
will do
if that ads complexity (I bet it would). Again please remember I'm a
novice
with minor experience :)

Thanks so much,
~Brendan

Equates to 0.002%, 0.003% or 0.005 % tolerance.
32768Hz
watch crystals aren't that good (if I remember my Farnell catalogue
** They have 20 ppm @ 25C accuracy too, I'm afraid.
..... Phil

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