In the figure below we have an interesting circuit for those with a project that requires a frequency multiple than that provided by a crystal. The crystal can have frequencies in the range of 100 kHz to 4 MHz and the trimmer can vary this frequency appreciably, obtaining the best oscillation point. The circuit supply, in fact, can be done with voltages between 5 and 15 Volts. Remember that with lower voltages, the higher oscillation frequency also decreases. An interesting application for this circuit is in the generation of precision pulses for frequency meters, clocks, stopwatches, controlled by crystal. The signal obtained at the outputs is not perfectly square, showing an active cycle that depends on the division.
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