Beat frequency indicator

  
This circuit uses LEDs to display the beat frequency of two-tone oscillators. Only one LED is on at a time, and the apparent rotation of the dot is an exact indication of the best frequency
Beat frequency indicator - schematic

When fl is greater than f2, a dot of light rotates clockwise; when fl is less than f2, the dot rotates counterclockwise; and when fl equals f2, there is no rotation.




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