DDS
Below is my output buffers for my DDS 2 from N3zi

   

Gain of the LT1253 amp is: A = 1 + Rf/Rg, Rf=620, Rg=180. Input impedance is determined mostly by the resistor from the input pin3 to the 1K resistor divider.

 
 

The silk-screen indicates correct orientation for a 2N4401. For a 2N2222A the flat side must be facing the left.

The right end of R4 is close enough to short to GND on early version of this board.
Version made after Feb 21, 2013 have been corrected. Make sure the pads for the connection of R4 and R6 are not shorted to the gnd plane.

 

DDS for Hams

Using a Chinese DDS for a dual band transceiver LO - SV3DJG

 
DDS Projects DDS Chips & Parts AD9850/51 Projects

WD8DAS DDS VFO Project

VA3NDO DDS VFO

DDS VFO - G4GXO

DDS VFO Driver Amp

AA0ZZ DDS VFO

DDS VFO in QST

WD8DAS DDS VFO Projects

Kits and Parts DDS Project

 

SiLabs VXOs

DDS chip controlled by Java program (ElecDesignMag)

VCXO Si570 10MHz to 1.4GHz

K5BCQ Si570 VFO kit

SI9834

Calc SI9834 Register Values

Programming the SI9834

SI9834 App Notes

SI9834 Design Tools

DDS for hams - 55MHz

 

AD9850 DDS boards on eBay

Using eBay AD9850 boards - VK5TM

Beacon using eBay 9850 brd

DDS VFO 9850 & PIC

Using the cheap 9850 brds on eBay

DDS Function Generator

AD9850 eBay boards in a VFO - VK5TM

Serial Controller Software for AD9851

DDS VFO with 16F84 AD9850

DFVO-II Digital VFO with DDS

AD9851 Data Sheet

DDS VFO with AD9854 - W6JL

DDS-60 - N2APB

TheLadder Line - DDS-60

DDS VFO - HamRadioIndia

Software for AD9850/51 projects - VK1OD

DDS Generator and Wobbler - OM3CPH

K6ESE DDS VFO Project - (no kits avail)

DDS VFO w/PIC 16F84

Another DDS VFO w/PIC 16F84

Still another DDS wi/PIC 16F84

Crystal Replacement - SI570

Arduino DDS

DDS VFO using eBay AD9850 board

 

DDS Kits

N3ZI DDS 2

AA0ZZ DDS VFO

N3ZI DDS2 Manual

N3ZI DDS2 Review on eHam

N3ZI Kits

NorCal DDS VFO Kit

NorCal FCC-1 Freq Counter

DDS-60 Kit

DDS VFO using AD9854

DDS VFO Kit

9850 DDS VFO (Uses 16C84)

DDS VFO Hagerty Radio

Kanga DDS VFO

Mini-kits DDS

N4YG DDS

SI570 VFO Project

PIC SI570 VFO

Firmware USB AVR Si570 controller

 

DDS VFO HamRadioIindia

 

http://www.analog.com/static/imported-files/tutorials/450968421DDS_Tutorial_rev12-2-99.pdf
 
"All About Direct Digital Synthesis"
http://www.analog.com/library/analogDialogue/archives/38-08/dds.html
 
Digital Radio Receivers:
http://www.analog.com/static/imported-files/tech_articles/480501640radio101.pdf
 
 

AD9850/51 Products

AD9850 TechNotes - Analog Devices

Configuration Tools

AD9850 DDS for Hams

Signal Generator - AD9850/16C84

AD9850 pcb(eBay) w/ Arduino software

AD9850 pcb w/125MHz clk on eBay

AD9850 module description - ElecFreaks

AD9850 module - ElecHouse

DDS-60 - How to Use

DDS-60, 1 - 60MHz daughterboard

DDS Sig Gen w/LCD - eBay China

AD9850 DDS Manual

AD9850 module - iStore

DDS Signal Gen Using eBay AD9850