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From: "Ken Taylor"
Subject: Re: Need schematic for digital timer (Help)
Date: Thu, 31 Oct 2002 13:57:06 +1300
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"Just outa Time" wrote in message
> I'm a student in electronics technology and need to come up with a
> schematic/parts list for a timer project. I am totally lost. The
> timer characteristics will need to be:
> * Counts to 10 minutes, displaying an illuminated LED at the end of
> each minute.
> * Has a reset that can be activated anytime, starting the count
> sequence again.
> * Has an audible alarm at the end of the 10 minute elapsed time.
> * Operates from 12-15 vdc power source
> Our textbook only discusses the use of gates / 555 timers / D
> flip-flops in terms of generalities and offers no specific design
> information. There isn't time to order a book. I was thinking of the
> TTL Cookbook or some such title, but the project is due soon. Does
> anyone have a schematic that could be adapted to produce this timer?
> Thanks much! Justin
Since you have info on the 555, take a look at
for TTL data sheets. A search on "555 timer" will give you any extra info
you need to get one of those beasts going, then the rest is conceptually
trivial, as they say.
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