Article View: sci.electronics
Article #21208Re: Timer Ckt - 2 hrs
From: Rob Warnock
Date: Tue, 25 Apr 1989 04:23
Date: Tue, 25 Apr 1989 04:23
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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
UUCP: {amdcad,fortune,sun}!redwood!rpw3
DDD: (415)572-2607
USPS: 627 26th Ave, San Mateo, CA 94403
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Path: arc1-ca.pugleaf.net!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