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Article #440

Re: Idea for LED sequencer

#440
From: Jim Cathey
Date: Tue, 03 Nov 1992 22:25
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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.

Why not try a shift register?  Something like a single 74LS374 and a single
74LS74 should be easy to flange up into a reset-to-1 10-stage ring shifter.
There should be CMOS analogs of these parts.

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Path: arc1-ca.pugleaf.net!sparky!uunet!ulowell!m2c!bu.edu!olivea!isc-br!tau-ceti!jimc
From: jimc@tau-ceti.isc-br.com (Jim Cathey)
Newsgroups: sci.electronics
Subject: Re: Idea for LED sequencer
Message-ID: <2789@tau-ceti.isc-br.com>
Date: 3 Nov 92 22:25:31 GMT
References: <1992Nov3.094923.44351@kuhub.cc.ukans.edu>
Organization: ISC - Bunker Ramo, Spokane, WA
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