🚀 go-pugleaf

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.

 
----- Steve Lemke ------------------- "MS-DOS (OS/2, etc.) - just say no!"
----- Internet: steve@ivucsb.UUCP; lemke@apple.COM   AppleLink:  LEMKE
----- uucp:     pyramid!comdesign!ivucsb!steve       CompuServe: 73627,570
----- alt.uucp: {decwrl!}sun!apple!lemke             GEnie:      S.Lemke
----- Quote:    "What'd I go to college for?"   "You had fun, didn't you?"