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From: mouse@mcgill-vision.UUCP
Newsgroups: sci.electronics
Subject: Re: Infra-Red Receiver?
Message-ID: <726@mcgill-vision.UUCP>
Date: Wed, 1-Apr-87 20:17:06 EST
Article-I.D.: mcgill-v.726
Posted: Wed Apr  1 20:17:06 1987
Date-Received: Thu, 9-Apr-87 00:13:00 EST
References: <1922@ihlpl.ATT.COM> <562@puff.WISC.EDU> <3972@fritz.UUCP> <801@cooper.UUCP>
Organization: McGill University, Montreal
Lines: 23

In article <801@cooper.UUCP>, gene@cooper.UUCP (Gene from EK Enterprises) writes:
> In article <3972@fritz.UUCP>, dennisg@fritz.UUCP (Dennis Griesser) writes:
>> ... until I found out that the data printed on the back of the
>> blister pack gave the WRONG PIN-OUT FOR THE IR LED!

> What I do in most cases is not to trust such things like "short lead
> is the cathode, long lead is the anode" or any pictures of the case.
> Unless the LED is in a mondo-strango case, look through the plastic
> and match the leads with this drawing:

> [drawing]

Or you could always break down and use a dc ohmmeter....there are very
few (probably none in working order) ohmmeters which will put out
enough current to fry the LED, and similarly few which will put out
enough voltage to fry it when reverse-biased.

					der Mouse

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