Is that a PR Peterson Radio logo?
On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen
<[email protected]> 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) 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
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