Article View: sci.electronics
Article #7983Re: Simple one evening project
From: Mark Lord
Date: Mon, 29 Oct 1990 15:51
Date: Mon, 29 Oct 1990 15:51
28 lines
1732 bytes
1732 bytes
In article <4748@bwdls58.UUCP> I wrote:
>
>Well, Radio Shack (here) only sells the two-lead type of bicolor LEDs.
>With these, the direction of current flow determines the LED color.
>
>Any gurus out there who'd be willing to post an equally quick&clean
>circuit for performing the same function with this two-lead type of LED ?
As a starter, I propose the following circuit, using a quad NOR gate package:
|\
Reduced Write -+-------------| \o------+
-|-- +---| / |
\ / | |/ LED
\/ | |
o | |\ R220
+--------|---| \o------+
____________ | | /
Drive In Use -----------+---|/
The invertor from ReducedWrite to the bottom NOR gate is simply
one of the spare NOR gates from the package, with the other input
tied to ground (resistor?).
--
___Mark S. Lord__________________________________________
| ..uunet!bnrgate!mlord%bmerh724 | Climb Free Or Die (NH) |
| MLORD@BNR.CA Ottawa, Ontario | Personal views only. |
|________________________________|________________________|
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!cunews!bnrgate!bwdls58!mlord From: mlord@bwdls58.bnr.ca (Mark Lord) Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware Subject: Re: Simple one evening project Keywords: IBM, PC, floppy drive, LED, in use, color, density Message-ID: <4749@bwdls58.UUCP> Date: 29 Oct 90 15:51:53 GMT References: <1990Oct23.162706.10585@elroy.jpl.nasa.gov< <4748@bwdls58.UUCP> Sender: mlord@bwdls58.UUCP Reply-To: mlord@bwdls58.bnr.ca (Mark Lord) Organization: Bell-Northern Research, Ottawa, Canada Lines: 28