Mini HF crystal tester
by sv3ora

This crystal tester is a modified version presented on Elektor magazine. My version, which is shown below, is able to lit the green LED that I have used, even with low "activity" crystals. I have tested this crystal tester with crystals ranging from 1.84MHz to 30MHz and it works perfectly fine without requiring any adjustments.

A further modification could be to put a switch after the 2.2nF and isolate the oscillator from the detector, to use it also as a quick RF signal generator at the crystal frequency, at the flip of this switch.

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