The LED clock consists of 60 LEDs which are placed circular around a common analog clock. The LEDs are used to display the seconds. Essential part of this circuit is the LED driver MAX7219 from Maxim. A datasheet is available on Maxim s homepage. The

AM调制和解调的整个过程，同时有频域和时域的波形-The whole process AM modulation and demodulation, while the frequency domain and the time domain waveform