FUNCTION
GENERATOR
A
PROGRAMMABLE
AD9833 DDS
A
useful and fun project from Gary / AA7VM
This project can be found in QST NOV 2005
Contact the author AA7VM for the HEX Code
I did not fabricate my own board for
this project, as the pitch of the AD9833 was too fine for my Homebrew
laserprinter / acetate / heat
etching process.
I instead purchased the board from FAR
CIRCUITS
The project uses an AD9833
programmable DDS chip
which is connected to the parallel
port of a PC.
Software for the DDS is available
from Analog Devices
and can provide sine, square, ramp,
and sawtooth waveforms
up to around 1 MHz or more.
My mods of the original project
include a variable output port, output DC blocking capacitors, and a
power LED.
Here is a photo of the PC running the
DDS at 10 KHz:
Front / rear / and inside the project: