[time-nuts] Improving the stability of crystal oscillators

[Didier Juges]

I bought 10kohm nominal NTC thermistors  from Digikey, P/N 490-4653-ND. They
are very small, 1/10th of an inch long or so.

I have used those (or similar parts) in projects both at home and at work
(in military equipment...) for about 15 years.

Didier KO4BB

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of SAIDJACK at aol.com
> Sent: Wednesday, October 10, 2007 1:17 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Improving the stability of crystal 
> oscillators
> 
> In a message dated 10/10/2007 11:13:21 Pacific Daylight Time, 
> jra at febo.com
> writes:
> 
> >We  first built a small proportional heater circuit that we 
> could shove 
> >in  next to the crystal, and that worked OK.  We finally found a  
> >source for thermistors spot welded to a spring clip that 
> would mount  
> >snugly directly to the crystal case.  With 12 volts applied, these  
> >heated the crystals very nicely.  With the heaters, we were able  to 
> >keep the systems running year round with about 1/10 the 
> service  calls.
> 
> Hi John,
>  
> interesting anecdote!
>  
> Would you know if the thermistors are still available? Who made  them?
>  
> Thanks
> Said
> 
> 
> 
> 
> 
> 
> 
> 
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