[time-nuts] Old Crystal.
David G. McGaw
david.g.mcgaw at dartmouth.edu
Mon Mar 1 01:39:41 UTC 2021
Stamp on the top is 1000 kHz in Russian.
David N1HAC
On 2/28/21 6:35 PM, Dan Kemppainen wrote:
> Hi All,
>
> I've picked up a couple of old crystals. Mostly because they look
> neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at
> about 1 mm thick. Was able to get them to oscillate using a Colpitts
> circuit. They will oscillate at 2.851Mhz (probably some strange mode)Â
> if given the chance.
>
> I've been scouring my reference books here, and haven't had much luck
> finding any details on how one would even guess at the parameters of a
> quartz like this.
>
> There area few numbers on them, 33 stamped on the side, 1000 (KHz???)
> on the top, 87 on the top, and hand written 501 (probably a SN).
> Digging on line, I'd guess an AT cut based on thickness. I'm guessing
> the 33 is capacitance in pF. 87, might be year.
>
> If any of you have any suggestions on where to find information on how
> to get something like this to oscillate properly, guess at correct
> parameters, or even measure any of the parameters I would really
> appreciate it.
>
> I'm sure these are really nothing special, but it would be neat to
> give them a fighting chance to show what they can or can't do without
> breaking them!
>
> Thanks,
> Dan
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list