If you still have that bare crystal lying around, I suggest you try to use it as an air densitometer. Put it in a container and replace the air with something more dense (such as duster spray, butane or even solvent fumes) and you'll see the frequency vary appreciably.
FT-243 CRYSTALS, COVER SCREWED DIWN, SPRING LOADED. ALSO PENCILS WERE USED TO LOWER FREQUENCY, SANDING TO INCREASE FREQUENCY. NO BIG CHANGE WAS POSSIBLE, BUT A MULTI-KILOHERTZ CHANGE WAS POSSIBLE.
The experiment didn't illustrate the hypothesis, but you still found a "result"...kinda..."No result" is still a result from which you can come to a conclusion. Successful experiment!
Glueing the “addition mass” to the xtal may get you better results ? You’ll likely add resonances and weird harmonics by balancing items on it like that, but without “coupling” mass to the xtal, you’ll be unlikely to change its fundamental ?
the mass should be physically attached to electrode surface atoms such as coating the surface with a thin layer of a metal to increase the surface electrode mass
once i was thinking is it possible to drift , shift or change working frequently of crystal oscillator by Opning and changing crystal resonance properties by increasing its surface mass by putting different matrial on it like thin layer of vax oil or anything ? i think this is good video to ask ??
You really need to get the mass on the crystal surface in much better contact. A dab of ink would give you a few hundred Hz of shift. Adding lumps of stuff doesn't seem to work the same way. I found that watching the frequency and phase on a VNA get better resolution than using a frequency counter. That was for building a water toxicity sensors a decade or so back.
If you still have that bare crystal lying around, I suggest you try to use it as an air densitometer. Put it in a container and replace the air with something more dense (such as duster spray, butane or even solvent fumes) and you'll see the frequency vary appreciably.
FT-243 CRYSTALS, COVER SCREWED DIWN, SPRING LOADED.
ALSO PENCILS WERE USED TO LOWER FREQUENCY, SANDING TO INCREASE FREQUENCY. NO BIG CHANGE WAS POSSIBLE, BUT A MULTI-KILOHERTZ CHANGE WAS POSSIBLE.
The experiment didn't illustrate the hypothesis, but you still found a "result"...kinda..."No result" is still a result from which you can come to a conclusion. Successful experiment!
This is actually a known technique - search for "quartz crystal microbalance". There are also similarly based thermometers, such as the
HP 2804A.
Glueing the “addition mass” to the xtal may get you better results ?
You’ll likely add resonances and weird harmonics by balancing items on it like that, but without “coupling” mass to the xtal, you’ll be unlikely to change its fundamental ?
the mass should be physically attached to electrode surface atoms such as coating the surface with a thin layer of a metal to increase the surface electrode mass
once i was thinking is it possible to drift , shift or change working frequently of crystal oscillator by Opning and changing crystal resonance properties by increasing its surface mass by putting different matrial on it like thin layer of vax oil or anything ?
i think this is good video to ask ??
1:40 wow i am surprised you are doing exactly that!!
i never heard that someone already did this chip crazy things to this
The weight may not have been coupled well. Grinding with a diamond burr may lighten it. Perhaps magic marker will shake with it.
Did covering the crystal with its metal housing again do anything with the frequency?
You really need to get the mass on the crystal surface in much better contact. A dab of ink would give you a few hundred Hz of shift. Adding lumps of stuff doesn't seem to work the same way. I found that watching the frequency and phase on a VNA get better resolution than using a frequency counter. That was for building a water toxicity sensors a decade or so back.
NICE VIDEO NICE ALL