🚀 go-pugleaf

In article <1617@argus.UUCP> ken@argus.UUCP (Kenneth Ng) writes:
>One of my first electronics projects was the XR-2240!  After I found out
>that a 555 isn't too good for an 8 hour delay...

Actually, if you want long delays and don't insist on using a single chip,
much the simplest way to proceed is to build a reasonably slow oscillator
with a 555 or whatever and then just run the output into a CMOS counter,
e.g. 4040 or 4060.  The counter's power consumption is negligible and the
available counters go up to a division ratio of 2^16 or so.  Their main
limitation is that the division ratio has to be a power of 2.
-- 
MSDOS, abbrev:  Maybe SomeDay |     Henry Spencer at U of Toronto Zoology
an Operating System.          | uunet!attcan!utzoo!henry henry@zoo.toronto.edu