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- Path: 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
-
- 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
- --
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