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LED zero beat display circuit

2016-12-20 06:08  
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LED zero beat display circuit
The two LEDs are connected with the opposite polarity, by the precision tuning of the receiver, the beat frequency can be displayed easily and intuitively. If the deviation of the beat frequency is above 1KHZ, the two LEDs are both blinking; if the deviation of the beat frequency is less than ±5HZ, the LED turns off. The luminous intensity of light emitting diode is decided by the audio amplifier low frequency response.