Needs pointers to a "distance detector"

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#2788

From: anabeim
Date: Sun, 26 Jan 1997 00:00

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I need to build a very small transmitter and receiver that will be placed on 
two objects. When these objects are more than a certain distance away about 2 
feet, a signal is generated to say turn a light on or sound a buzzard.
Can anybody help ?

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From: anabeim@system2.com (anabeim@system2.com)
Subject: Needs pointers to a "distance detector"
Date: 1997/01/26
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