-=> Roy J. Tellason said to Greg Mayman
 -=> about "STILL AROUND" on 10-23-04  12:06.....

 RJT> I have a bunch of those around as well.  I don't remember which pin is
 RJT> the output,  and I don't think the other pin is connected.  But yeah, 
 RJT> they run off the +5v supply.  In a conversation recently with somebody
 RJT> they mention that these draw a bit more power than using a crystal
 RJT> directly,  which he considered to be a disadvantage in some
 RJT> applications. 

The fact that the frequency is specified to six decimal places
makes me think that they may have some electronic temperature
compensation built in.

Many years ago I read about an oscillator circuit using an
NTC mounted close to the crystal to monitor the temperature, with
feedback to a varactor diode to compensate for the crystal's
natural thermal-versus-frequency variation.

That Saronix oscillator is marked NTC070C which could indicate a
negative temp coefficient of 70 ppm per degree C... or maybe
something quite different 

 RJT> That 14.311318 MHz figure is pretty common.  It was used in the c64, 
 RJT> and also in the original IBM PC/XT class machines -- that's where that
 RJT> "4.77 MHz" came from,  dividing it by 3.  Divide it by 4
and you get
 RJT> the 3.58 MHz colorburst frequency.  I have no oscillator modules for
 RJT> that frequency but have a whole bunch of crystals... 

Dividing by three is unusual...

   ,-./\
  /     \ From Greg Mayman, in beautiful Adelaide, South Australia
  \_,-*_/    "Queen City of The South"    34:55 S  138:36 E
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