N3ZI DDS VFO
Direct Digital Synthesizer Kit
RS-232 version DDS VFO Full kit
The photo on the left shows the assembled Basic Kit RS232 version, full kit on the right.
(That's an Altoids tin it's sitting on) More Pics

LCD Included

SOLD OUT
This DDS Kit has been replaced by our
NEW Super DDS

A DDS (direct digital synthesizer) VFO is the state of the art in VFO technology.  Virtually all modern commercial radios use this technology.  It provides fantastic stability, no drift, and precision.  You simply tell it what frequency to generate and it does it.  Note unlike some other DDS modules being shown, this one is complete including microprocessor.  All you do is apply power, turn the dial (shaft encoder) and out comes the frequency.  So it is possible to retrofit vintage radios, QRP radios, and just about anything else.  As an interesting note, when I attached it to my 40m homebrew challenge radio, it suddenly turned into a rather broad range receiver.   I could receive from the AM broadcast band to 10MHz.
Production PCB
Click on graph above for more info on test data

Technical Documentation, Manual, Serial LCD Data Sheet, Schematic, RS232 interfacing, LCD Interfacing,

SOLD OUT
Take a look at out new 1Hz super smooth tuning DDS for $79
Bare Bones
(PCB, Micro & Crystals only )
Basic Kit
(Computer Control ONLY)

Full Kit
Now available with or without the DDS Chip at a lower price.
This partial kit consists of the bare PCB, Programmed Microprocessor, 50MHz oscillator can, and Microprocessor crystal (13.44MHz) .  You'll need to get the DDS chip from Analog Devices or Digikey,  All the other parts are generally available from many sources. 
PCB, Programed Microprocessor plus other components to make a fully functional DDS VFO controlled via an RS-232 Port or USB (using a 3rd party adaptor) 50MHz clock supplied. No LCD, no Rotary Encoder, no switches, no connectors.
Same as Basic kit, plus LCD, Rotary Encoder, 2 Switches.  Makes a fully functional DDS VFO that can be controlled using the Rotary Encoder and switches, and LCD Display (& RS-232) LCD module, Mechanical rotary encoder included.

DDS chip (AD5932) required but not inlcuded (it is available direct from Analog Devices, frequently as a free sample, or from Digikey)





SOLD OUT

The other parts needed to Complete this DDS are available from a variety of courses. A Bill of Materials is here, which itemizes all parts, suggested sources, and estimated cost.

SOLD OUT

DDS chip (AD5932) required but not inlcuded (it is available direct from Analog Devices, frequently as a free sample, or from Digikey, but not from us with this version of the kit)

Note: The micro supplied with this kit has same firmware as my other DDS kits, so you can add an LCD, encoder, switches and other items yourself if you need them.
A Bill of Materials is here, which itemizes all parts, suggested sources, and estimated cost.

DDS KIT w/ LCD and Standard Encoder, DDS Chip not included

SOLD OUT


The DDS chip is required for this kit, but I am sold out.
But here's how to get your free sample DDS chip from the manufacturer.
  • Go to their web site www.analog.com
  • In the Search box, type: AD5932 and click "search"
  • Scroll all the way down to the bottom of the page.
  • Look for the chip you want: AD5932YRUZ
  • Under the column label "samples cart" Click on "add to samples cart" They normally allow 1 or 2 free samples.

Digikey also has them in stock