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From: lgardi@uwovax.uwo.ca
Subject: Re: Infra Red Emitters
Organization: University of Western Ont, London
Date: Fri, 5 Mar 1993 16:38:00 GMT
Message-ID: <1993Mar5.123800.1@uwovax.uwo.ca>
References: <1993Mar5.111215.1@uwovax.uwo.ca> <1n7vc9$bf8@fnnews.fnal.gov>
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In article <1n7vc9$bf8@fnnews.fnal.gov>, gad@fncrd6.fnal.gov (greg deuerling) writes:
> In article <1993Mar5.111215.1@uwovax.uwo.ca> lgardi@uwovax.uwo.ca writes:
>>I have been working with infra red emitters/detectors and can't seem
>>to get a range of more than a couple of inches. Does anyone out there
>>know how the VCR remote controls can drive the LED to be able to
>>bounce off walls and ceilings and faces and still change the channel.
>>I would very much appreciate any insite into this problem.
> 
> It's not the LED you need to mess with, it's the receiver. I played with
> this problem for some time a few years ago and never got much more than
> a few feet of range using OP-Amps, but when I used a chip that you attach
> a detector on I got the range up to what TV set remots can do.
> 
> Motorola I know makes a nice receiver chip. 
> Also, you may want to stick two emitters in parallel, it aslo helps alot.
> 
> Hope this helps...
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Well, I have a detector that I got from Radio Shack that works very well
with my VCR remote control but not with a regular old photo diode (which
I also bought at Radio Shack). I'll try two emitters in parallel as
suggested and see if that helps. Thanks for the response.
LORI
-- 
<<<RED FISHY WINS>>>
Lori Gardi				(519) 661-2111 ext 8695
Dept. of Astronomy,			lgardi@uwovax.uwo.ca
University of Western Ontario
London, ON, CANADA, N6A 3K7
