Article View: sci.electronics
Article #21238Re: Timer Ckt - 2 hrs
From: Dave Turner
Date: Wed, 26 Apr 1989 19:30
Date: Wed, 26 Apr 1989 19:30
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In article <25392@amdcad.AMD.COM> rpw3@amdcad.UUCP (Rob Warnock) writes:
|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.
I don't know how the circuit will be used but this seems to be overkill.
A simple 555 timer seems like it would be sufficient for this.
--
Dave Turner 415/542-1299 {att,bellcore,sun,ames,pyramid}!pacbell!dmt
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!oliveb!amdahl!pacbell!ptsfa!dmtReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!oliveb!amdahl!pacbell!ptsfa!dmt From: dmt@PacBell.COM (Dave Turner) Newsgroups: sci.electronics Subject: Re: Timer Ckt - 2 hrs Message-ID: <4783@ptsfa.PacBell.COM> Date: 26 Apr 89 19:30:57 GMT References: <8331@ihlpf.ATT.COM> <25392@amdcad.AMD.COM> Reply-To: dmt@PacBell.COM (Dave Turner) Distribution: na Organization: Pacific * Bell, San Ramon, CA Lines: 16