Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!amdcad!rpw3
From: rpw3@amdcad.AMD.COM (Rob Warnock)
Newsgroups: sci.electronics
Subject: Re: Timer Ckt - 2 hrs
Message-ID: <25392@amdcad.AMD.COM>
Date: 25 Apr 89 04:23:21 GMT
References: <8331@ihlpf.ATT.COM>
Reply-To: rpw3@amdcad.UUCP (Rob Warnock)
Distribution: na
Organization: [Consultant] San Mateo, CA
Lines: 17

In article <8331@ihlpf.ATT.COM> taizoon@ihlpf.UUCP (Chinwalla,T.) writes:
+---------------
| Does anyone have a ckt or recommendation for a chip(s)
| that is inexpensive and can produce a timing of 120 minutes +- 10 %
+---------------

I would use a 14-stage CMOS counter chip (4027? 4040? sorry, I forget),
driven by your favorite 2 Hz oscillator.  It's cheap, and if you feed it
2.27 Hz, the topmost bit will tick over every two hours.


Rob Warnock
Systems Architecture Consultant

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