How do you build a resonating crystal circuit?

[Nabo00o]

Oh sorry I was getting ahead of myself Just thought for a minute that you were doing the same thing I was doing

About the crystals, you should just search for one at an Internet store, I don't thinks its that easy to make on your own, except if you happen to have a quartz crystal deposit somewhere near you 
Also, if you come from Scandinavia, England or some other place close, you get what you need from this site:
https://www1.elfa.se/elfa/index.html

Edit: It seems like they are selling all over the world now.

[solarinstallation]

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[IotaYodi]

http://www.deepsonic.ch/deep/freeload/audio_frequency_chart.pdf