Path: utzoo!attcan!uunet!wuarchive!usc!ucla-cs!rutgers!galaxy.rutgers.edu!argus!ken
From: ken@argus.UUCP (Kenneth Ng)
Newsgroups: sci.electronics
Subject: Re: XR-2240
Message-ID: <1637@argus.UUCP>
Date: 20 Mar 90 19:37:58 GMT
References: <3687@tukki.jyu.fi> <1617@argus.UUCP> <1990Mar15.171310.28917@utzoo.uucp>
Organization: NJ Instit. of Tech: TEIES Project
Lines: 22

In article <1990Mar15.171310.28917@utzoo.uucp>, henry@utzoo.uucp (Henry Spencer) writes:
: 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,

If I were to do it now I'd probably use a 555 and a loadable count down
timer.  It'll be cheaper, easier to find the parts, and having a countdown
display is kinda neat :-).  But when your 12 years old, and see the wonder
of electronics, the smell of rosin, and the thrill of seeing all those
debugging LED's go on and off, the Simpson meters pulsating on command,
the sexy shiny new integrated circuits; it's almost better than sex :-).



-- 
Kenneth Ng: Post office: NJIT - CCCC, Newark New Jersey  07102
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