Mini HF crystal tester
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
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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