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Article #440Re: Idea for LED sequencer
From: Jim Cathey
Date: Tue, 03 Nov 1992 22:25
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. -- +----------------+ ! II CCCCCC ! Jim Cathey ! II SSSSCC ! ISC-Bunker Ramo ! II CC ! TAF-C8; Spokane, WA 99220 ! IISSSS CC ! UUCP: uunet!isc-br!jimc (jimc@isc-br.isc-br.com) ! II CCCCCC ! (509) 927-5757 +----------------+ "PC's --- the junk bonds of the computer industry"
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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 Lines: 23