Here is the circuit board to build the 100Hz to 10MHz Signal Generator project project based on the DDS-25. It's a complete signal generator that covers 100 Hz to 10.8 MHz and drives a 50 ohm load at signal levels from -120 to 0 dBm in 0.2 dB steps.
The generator can be built with either a color LCD touchscreen display or controlled using a computer via USB port. All components are readily available from on-line retailers and the PC controlled version can be built for about $100 and the LCD version for about $160. More information including the complete bill of materials required to build this project can be found here:
No surface mount assembly required; designed to be assembled by humans!