Re: Simple one evening project

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Article #7984

#7984

From: Wolfgang S. Rupprecht
Date: Tue, 30 Oct 1990 15:28

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>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 ?

Yea. I'll bite.  The simplest solution is if you have a spare 1488
rs-232 driver.

		 +12v
	   1488   |
		 |\			 Red-Green
	---------| >------/\/\/\/\--------(LED)-----+
		 |/	   1k 1/4w		    |
		  |	   			    V gnd
		-12v


This will drive the led with about +/- ~8 ma.  Change the resistor to
470 ohms to increase this to 16ma if you want and your led likes this
much current.

-wolfgang
-- 
Wolfgang Rupprecht    uunet!wsrcc!wolfgang (or) wsrcc!wolfgang@uunet.uu.net
Snail Mail Address:   Box 6524, Alexandria, VA 22306-0524

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Message-ID: <1990Oct30.152843.2922@wsrcc.uucp>

Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!usaos!wsrcc!wolfgang

References: <1990Oct23.162706.10585@elroy.jpl.nasa.gov< <4748@bwdls58.UUCP>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!usaos!wsrcc!wolfgang
From: wolfgang@wsrcc.uucp (Wolfgang S. Rupprecht)
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: <1990Oct30.152843.2922@wsrcc.uucp>
Date: 30 Oct 90 15:28:43 GMT
References: <1990Oct23.162706.10585@elroy.jpl.nasa.gov< <4748@bwdls58.UUCP>
Organization: Wolfgang S Rupprecht Computer Consulting, Washington DC.
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