Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!hpfcso!hplvec!mattn
From: mattn@hplvec.LVLD.HP.COM (Matt Nieberger)
Newsgroups: sci.electronics
Subject: Re: Plans wanted for binary/BCD digital clock
Message-ID: <2610006@hplvec.LVLD.HP.COM>
Date: 16 Apr 91 16:21:25 GMT
References: <102132@tut.cis.ohio-state.edu>
Organization: Hewlett-Packard Co., Loveland, CO
Lines: 26

>   I have been trying to find plans or a kit to build a binary/BCD clock.
>   I am not concerned if it is 12 or 24 hour.  Are there any plans in any
>   old "Popular Electronics" or the like?  Does Heathkit make one?

>   Thanks,

  Here is a  possible source: about 10 years ago I built a clock using 
Radio Shack's 7-Segment LEDs and the schematic was contained in the
LED's package.  All you need is to:

  1) Obtain a copy of the schematic (My copy was lost many moves ago).

  2) remove the BCD-to-7SEG decoders and drive your own LED from the BCD.

  If the schematic can not be found, look at any circuit that sync's to the
60Hz AC line and build a counter (up to 60) for the seconds and use this
signal to drive the rest of the clock counters (hours and minutes). BTW
this is all that the Radio Shack schematic did.

  Wasn't it great when Radio Shack still included usefull schematics and 
data sheets with all of their electronic components!!!!

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                Matt Nieberger (mattn@hpmtlx.lvld.hp.com)
               { Insert standard company disclaimer here }
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