The circuit uses a light emitting diode to display the difference frequency of the two-color oscillator. Only one LED can be lit at a time, and if there is a significant rotation of the point, there is an indication of the best frequency. When f1 is greater than f2, the spot rotates clockwise, and vice versa, rotates counterclockwise. When f1 is equal to f2, the spot does not rotate.
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