A Digital VFO with LCD Graphics Display

摘要

For several years, I've wanted to build my own DDS (direct digital synthesis) VFO (variable frequency oscillator).rnAnalog Devices makes one of the most popular ranges of DDS chips, which digitally generate precise sine-waves covering frequencies from 'practically DC to daylight'; well, up to many hundreds of MHz.rnSome time ago, I managed to obtain several samples, but that was as far as things went. I was just too busy with work and family matters to devote any dedicated time to the project.