AD9851:  Complete DDS synthesizer

BNC cable:

Waveform selection： Left for Square wave, right for Sine wave.
Buttons：from left to right,

Selection button：Press to enable and move the cursor on the LCD display, while the LCD indicates which digit of the output frequency is     being displayed and set.

Increase button：Press to add 1 to the current digit value.
Reduction button：Press to deduct 1 to the current digit value.
Set button：Disable the cursor and end modification.

Warning ： The power source SHOULD be 7 – 12VDC, barrel inner–positive! More than 12VDC will cause over-voltage damage to this board！