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From: "petrus bitbyter"
Subject: Re: Electronics Newbie Needs Help With A Timer Delay Circuit...
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
Date: Wed, 02 Oct 2002 03:42:23 GMT
NNTP-Posting-Date: Wed, 02 Oct 2002 05:42:23 MET DST
Organization: chello broadband
You need two timers. The first one is triggered by a pushbutton. The second
one is triggered by the first one. The second timer will turn the light on.
There is a hughe amount of 555-info on the net. Monostables (the timers you
need) are found at http://www.andy-clarkson.me.uk/555/mono4.html , but there
are many, many more.
You have to amplify the output of your second timer to switch the lamp. When
using a low voltage type you don't need a relay. A power transistor will be
easier and cheaper.
"Jake" schreef in bericht
> Thanks for all the replies guys.
> I'm sorry for not clearly stating the in's and out's of what I was
> thinking. (it was late...blahblahblah..)
> Anyways, There will be a podium with many buttons.
> Only one button will actually be part of circuit, the rest will just
> be decoration.
> When the patron presses the pushbutton I want it to start a 10 second
> delay circuit that after the 10 second period turns on light. The
> light doesnt neccesarily have to be an AC powered bulb, and I agree
> that this would be to much of a saftey issue if nothing else. After a
> certain amount of time (25 seconds?) I want the light to go out and
> the circuit to reset itself ready for the next person to press it. The
> switch needs to be momentary action or else it would require the
> viewer to reset the switch each time. Wouldn't it?
> At this point I am totally open to any changes that would make it
> easier to construct, run, or maintain. And certainly make is safer as
> well. Hopefully this explains what I'm thinking, but if not just ask.
> Thanks again as I appreciate the knowledge and advice
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