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Project Notes

#141 CrystalTester

A Colpitts Oscillator circuit for testing crystal oscillators with a frequency counter.


G3PTO’s Xtal Tester is a simple circuit for measuring an (unknown) crystal’s fundamental resonant frequency with a frequency counter. It’s a very basic test, but good enough to verify the crystal is working and finding it’s frequency.

Of course, the reverse is also true: the circuit provides a nice reference signal for testing a frequency counter!

The circuit is a variant of a Colpitts Oscillator, and is similar to the one built by w2aew - except with component values varied for a different supply voltage.



The Schematic

The Build

Credits and References

About LEAP#141 RadioOscillators
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.