Dr Andrew Smith

The SI570-based VFO is particularly interesting.

to dds electronics ham radio si570 vfo ... on 04 October 2009

LCD Digital Dial DDS VFO

Nice simple-looking DDS kit based on an AD chip.

to dds electronics ham oscillator radio vfo ... on 22 September 2009

Dr Andrew Smith

Various electronics projects -- very professionally done. The stuff about the SI570 DDS is particularly interesting, since I haven't seen it mentioned elsewhere and it's much easier to deal with than most DDS chips.

to dds electronics ham oscillator radio retrotech vco ... on 05 August 2007

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