Article View: sci.electronics
Article #10806Re: Idea for LED sequencer
From: Mark Robinson (JO PhD)
Date: Wed, 04 Nov 1992 10:36
Date: Wed, 04 Nov 1992 10:36
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In article <2789@tau-ceti.isc-br.com> jimc@tau-ceti.isc-br.com (Jim Cathey) writes: >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 [...] >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 What about the 4017? This is a Johnson type decade counter - you put in a clock and each of it's 10 outputs goes high in turn. It has the usual reset and inhibit pins. problems- 1. The pinout was tampered with by the KGB to make it totally impossible to design a PCB for it. 2. I don't think you're supposed to drive LEDs directly from CMOS outputs- but it should be OK as long as you don't want them too bright. Mark mark-r@spec0.ee.man.ac.uk -- _____________________________________________________________________ Multimedia Information Systems Lab | Witty anecdote available real Dept. Of Electrical Engineering | soon now - just as soon as University of Manchester | MS releases it's long avaited Dover St. Manchester. M13 9PL | WittyAnecdote NT (TM).
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Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!warwick!uknet!mucs!mark-r From: mark-r@ee.man.ac.uk (Mark Robinson (JO PhD)) Newsgroups: sci.electronics Subject: Re: Idea for LED sequencer Message-ID: <6658@m1.cs.man.ac.uk> Date: 4 Nov 92 10:36:27 GMT References: <1992Nov3.094923.44351@kuhub.cc.ukans.edu> <2789@tau-ceti.isc-br.com> Sender: news@cs.man.ac.uk Reply-To: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD)) Organization: Dept Electrical and Electronic Eng, Manchester University, UK Lines: 34