This circuit will test crystals from 1MHz to 30MHz. When the crystal oscillates, the
output will pass through the 1n capacitor to the two diodes. These will charge the
4n7 and turn on the second transistor. This will cause the LED to illuminate.
output will pass through the 1n capacitor to the two diodes. These will charge the
4n7 and turn on the second transistor. This will cause the LED to illuminate.
Crystal Tester |
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