It’s been a pretty busy summer so far. The primary project on the BITX40. I decided to build my own DDS board for it. It’s based on an Atmel 328p, and has headers for the I2C OLED display, rotary encoder, and some extras. This board uses a Si5351A and has a five pole low pass filter on the output. This low pass filter nicely shapes the waveform into a Sine wave. There are some additional inputs if I want to add temperature, power, or SWR sensors.
As of this evening, I have the display, rotary encoder, and DDS output working together. More pictures to come. I have several of these boards that are spare. I’ll probably put the spares on my Tindie store.