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A crystal tester circuit is very simple, it contains only oscillator and detector inside. This crystal tester circuit uses one transistor for the oscillator and one transistor for the detector. Here is the schematic diagram of the circuit: The mechanism of this crystal tester is very simple. If a good crystal is connected to the [...]

This is a simple XTal tester circuit diagram. T1 and XTal have formed an oscillator. C1 and C2 are voltage divider for oscillator. if the XTal is safe, the oscillator will work well and its output voltage will be rectified by C3, C4, D1 and D2, then T2 will run and LED will light. The [...]