Beat frequency indicator

Posted on Aug 18, 2012

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
Click here to download the full size of the above Circuit.

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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