What's the easiest way to test unmarked crystals?

Ethan Dicks ethan.dicks at gmail.com
Thu Oct 19 20:35:17 CDT 2006

I have a small handful of crystals and was wondering what the easiest
way to divine their frequencies... I can say that I'm reasonably
certain that all of them are between 32.768Khz and 50MHz, but some are
blank, and some have non-obvious cryptic markings.  What I'm looking
for is some simple way to get them to oscillate and measure them with
a frequency counter (i.e. - assume one is starting with a working,
trustable frequency counter).

Is it as simple as a pair of inverters/NANDs in the classic crystal
loop, or is that circuit massively frequency dependent (i.e. - works
for 1Mhz-10Mhz, not faster or slower...)?

Thanks for any suggestions.


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