The practical crystal test circuit

Published:2011/6/1 20:33:00 Author:Seven | Keyword: crystal, test circuit | From:SeekIC

The writer has made a crystal test circuit of 10KHZ~1000MHZ with several simple elements(see as the figure). BG1 and its connected RC form a multi-frequency oscillator, after C3,D1 and D2 test the wave, the LED will get a voltage, and the polarity of the upper part is negative and the lower is positive, which drive the LED glow. If the crystal is broken and the LED is not glow, then we can install the circuit in the repairing power supply and leave two holes for the test elements. Notice: the two wires, which are led out from the crystal, can be too close to each other, or the oscillating amplitude will be reduced and the LED won't glowing.



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