Did you know that you can open up a quartz crystal to change its frequency by a few kilohertz? Here's how.

Contents:
0:00 Introduction
1:29 Starting with a bag of cheap crystals
1:43 What you need
2:20 Opening the crystal
2:56 Inside the crystal
3:37 Experiments with knife
4:17 With sandpaper to increase frequency
5:40 With pencil to drop frequency
7:46 Summary

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