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From: koning@koning.enet.dec.com (Paul Koning)
Newsgroups: sci.electronics,rec.radio.amateur.misc
Subject: Re: Adjust frequency of4 terminal, rectanglular oscillators?
Message-ID: <22416@shlump.nac.dec.com>
Date: 30 Apr 91 15:05:34 GMT
References: <1095@sousa.ltn.dec.com>
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Organization: Digital Equipment Co., distributed systems architecture
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|>In article <1991Apr20.235945.7393@zoo.toronto.edu>, henry@zoo.toronto.edu (Henry Spencer) writes...
|>>>> For space saving and cost reasons I would like to use one of 
|>>>> those small can oscillators with 4 terminals...
|>>>Very probably what you've got there is a crystal oscillator...
|>>My mistake; turns out there are other things that use the same package.
|>
|>Don't keep us in the dark Henry, what are those other things and how do 
|>they work?  I've seen QRP plans that use 4-terminal oscillators, and I've 
|>always wondered why there was no filter indicated to get the square wave 
|>down to a sine wave....  Are there 4-terminal oscillators with (modulatable
|>, is that a word?) sine-wave outputs?
|>
|>Willie Smith
|>smith@sndpit.enet.dec.com
|>smith%sndpit.enet.dec.com@decwrl.dec.com
|>{Usenet!Backbone}!decwrl!sndpit.enet.dec.com!smith
|>

I'd certainly guess that this is a crystal oscillator.  Keep in mind that
they come in a vast number of variants.  The majority is probably fixed
frequency squarewave output, but you can also get them with sinewave output,
and/or voltage controlled frequency (VCXO), etc.  Squarewave output can be
had in TTL levels (with either TTL or CMOS guts) or for higher frequencies
you can get ECL levels.

Lots of companies make these things; check your various catalogs or electronic
component rags for pointers.

	paul, ni1d