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From: youngqd@jacobs.cs.orst.edu (Dean Youngquist)
Newsgroups: sci.electronics,rec.radio.amateur.misc
Subject: Adjust frequency of4 terminal, rectanglular oscillators?
Message-ID: <1991Apr18.211835.29010@lynx.CS.ORST.EDU>
Date: 18 Apr 91 21:18:35 GMT
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Organization: Oregon State University, CS Dept.
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I am making a small low power transmitter as an alarm system 
for my bicycle.  It will have a small motion sensitive 
switch inside and will transmit when if the bike is moved.  
I would like to transmit audio picked up by a small mike, or 
at least I need to modulate the signal so I can hear it on 
my scanner.  
 
 For space saving and cost reasons I would like to use one of 
 those small can oscillators with 4 terminals.  The only 
 problem is how to modulate either the amplitude or the 
 frequency of this device.  I have noticed that varying 
 supply voltage changes both the amplitude and frequency.  Is 
 this the best way?  
  
  I don't have any spec sheets on these oscillators but I have determined
  V+, V-, and the output.  The other pin seems to be no connection.