LED zero-beat indicating circuit

Published:2011/4/13 4:08:00 Author:Nicole | Keyword: LED, zero-beat indicating | From:SeekIC

Two LEDs are connected with opposite polarity, it depends on the receiver accurate tune to the emission signal to display the zero-beat frequency conveniently and intuitively. When deviate beyond zero-beat frequency1kHz, two LEDs are conduction all the time; when deviate in zero-beat frequency 20Hz, two LEDs are flashing; when beat is in ±5Hz, LEDs are extinction. The luminous intensity of LED is determined by low-frequency response of the adopted audio amplifier.



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