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Visual zero beat indicator

2018-01-25 03:03  
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This circuit is suitable for an indicator to audio signal lower than 3Vp-p. In the circuit, we use a very small parts with only two of the LED display and built-up resistor for current depression.
Light-emitting diodes(LED) connected with reverse polarity provide a visual indication of zero-beat frequency.
Each Led is on for only half a cycle of the input.
When the input frequency is more than 1 kilohertz away from the zero-beat frequency, both LEDs appear to be on all the time.
As the input frequency comes within about 20 hertz of zero beat, the LEDs will flicker until zero beat is reached.
Both LEDs glow or flicker until zero beat is reached, when they go out.

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