BEAT FREQUENCY INDICATOR
Schematic:
Notes:
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. When f1 is greater than f2, a dot of light rotates clockwise; when
fl is less than f2, the dot rotates counterclockwise; and when f1 equals f2,
there is no rotation.
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