The crystal test circuit

Published:2011/6/5 21:51:00 Author:Seven | Keyword: crystal test | From:SeekIC

With some simple elements, we can make a crystal test circuit which can detect the frequency ranges 10kHz-100MHz, BG1 connects with a multi-resonate oscillator, after being detected by C3,D1 and D2, a voltage of upper-negative and lower-positive is got on the LED, which drives the LED to flow. If the crystal is broken, the LED won't glow. This circuit can be installed in a repairing power supply, leaving 2 holes for crystal detecting elements. Notes for assembling: the two wires led out from the crystal can be too close, or the amplitude will be highly reduced and the LED won't flow.



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