Path: utzoo!attcan!uunet!comdesign!ivucsb!steve
From: steve@ivucsb.UUCP (Steve Lemke <steve>)
Newsgroups: sci.electronics
Subject: Re: 1Hz signals
Keywords: counters, TTL, CD4566
Message-ID: <339@ivucsb.UUCP>
Date: 20 Oct 88 04:18:53 GMT
References: <2006@lll-lcc.llnl.gov>
Reply-To: steve@ivucsb.UUCP (Steve Lemke <steve>)
Distribution: na
Organization: The Audio Club at UCSB, Isla Vista, California
Lines: 27

In article <2006@lll-lcc.llnl.gov> rzh@lll-lcc.llnl.gov (Roger Hanscom) writes:
}
}   This question should be really easy for you guys!  I do OK with
}digital stuff, but most things in the analog domain are "mysteries
}of the universe".  I'm building a TTL digital counter, and I need a
}1Hz pulse train to feed it.  I'd like to use the 60Hz signal on the
}power transformer, and a MINIMUM of components to condition it and
}divide it down.  The transformer I'm using is nominally a 9v
}wall-plug type.  How can I convert that to some thing I can work
}with (read reduce the ~20v p-p to something like 5v p-p).  I know
}how to divide it with TTL, if I could just make the AC more well
}behaved to feed it to TTL.  I tried a 4566 IC like this (working
}from memory here, pls forgive lapses):

Wouldn't it be easier to just use a simple, two (or three?) component RC
network to generate your pulse train?  Actually, now that I think about
it, perhaps it takes a Schmidt Trigger or something like that - but I do
remember building a circuit like that to generate a stream of TTL level
pulses for a class project last year.  If you're interested, I can look it
up and send you (email, usenet, or USPS) the circuit.

 
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