🚀 go-pugleaf

In article <1992Nov3.094923.44351@kuhub.cc.ukans.edu> heacock@kuhub.cc.ukans.edu (Doug Heacock) writes:
-I'm putting together a quick-and-dirty circuit that will light 10
-LED's in sequence, one after the other.  Here's my idea so far:  I
-intend to use half of a 4011 (quad 2-input NAND gate) as a clock
-oscillator to drive half of a 4518 (dual synchronous up counter),
-which will in turn drive a 4028 (BCD-to-decimal decoder), which will
-actually drive the LED's.  I was thinking I could connect all of the
-LED cathodes to ground through a single 330-ohm resistor, since only
-one would be lit at a time.

Sounds fine to me.  You may want to look into the 4017 - it combines the
counter and decoder in one chip.  I have built these before with a 555
as the clock and a 4017 driving the LEDs.  If you need fewer than 10 LEDs,
just tie the first unused output back to the reset pin.  One resistor
for the current limiting will work fine.  Good luck.
/mike
-- 
\|/  Michael L. Ardai  N1IST   Teradyne EDA 
--- -------------------------------------------------------------------------
/|\  ardai@maven.dnet.teradyne.com