I have been trying to program  cheap Chinese DDS modules recently.   I wanted to  add a DDS VFO to one of my bitx rigs. These modules are available  at $4.5 from aliexpress. They claim that it can work up to 40Mhz. I used an arduino Uno along with a rotary encoder for  controlling the module. The… Continue reading Plug and Play DDS VFO with arduino