Baby's First DDS Signal Generator
Summary
A detailed open-source hardware project describing a low-cost DDS signal generator built around an RP2040, with a DAC0800, DG408 attenuator, and a PWM-based output stage. Includes circuit design decisions, PCB fabrication notes, software architecture, and performance demonstrations including DCF77 modulation. Useful for hobbyists, labs, and SMBs exploring programmable signal generation and RF-friendly hardware design.