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Preliminary
Project
information
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| In
view to
keep in
mind
continous
updates in
amateur
Home-brewing
field, I
decided to
build this
DDS KIT in
5 seperate
PCB
modules.
DDS kit
has 4
small
plug-in
PCBs that
fits on a
Motherboard.
Project is
designed
keeping in
mind
future up-gradation
of
Processor
or
Software.
DDS
Kit is
available
with
either V.1
or V.2 DDS
boards.
Other
modules
like PIC
16F628,
4X3
Keyboard,
7X1
Function
board and
DDS
Motherboard
are common
in both
the kits.
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| Picture
of the
completed
modular
DDS:
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Under
Construction
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the
picture to
enlarge
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DDS
Boards :
V.1 &
V.2
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DDS
V.1 board
has LPF to
42MHz
making it
suitable
for
frequencies
below
40mhz of Local
Oscillator
applications.
It has a
Mini-circuits
MAR-8
wideband
amplifier
followed
by another
LPF.
This
board uses
thru-hole
components
and has a
standard
14DIL
30MHZ
clock
oscillator
with a
possibility
to use
half size
oscillators.
Most
components
are
thru-hole
except,
AD9851 DDS chip,
1:1 RF
Transformer
and Output
amplifier.
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Coming
soon
Click
the
picture to
enlarge
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DDS
V.2 board
has an
output Low
Pass
filter set
to 70MHZ.
This board
is
designed
for those
who would
like to
make
a receivers/transmitters
using IF
of
30-45MHZ.
It has adjustable
output,
dual LPF
and many SMD
components
such as
AD9851, an
1:1 RF
Transformer
and a RF
amplifier.
V.2 board
has
possibility
to use
either a
14DIL
30MHZ
clock
oscillator
or a
programmable
oscillator
using
Maxim
Dallas
"Econ
Oscillator"
such as
DS1085.
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coming
soon
Click
the picture
to enlarge
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PIC16F628
Micro
controller
Board
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| PIC
Board
has a
PIC16F628
micro-controller
to handle
DDS chip. |
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4 X
3 High
Quality
Front
Panel
Keyboard
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| 4X3
Keyboard
which fits
on
motherboard
is
provided
for Front
Panel frequency
entry. |
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Function
Board
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| 1X7
Function
Board
is
accessible
from front
panel. Its
purpose is to
control
the PIC
program
residing
in 16F628
chip. It
has one
"spare"
button
& one
button
devoted to
"TX"
function. |
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DDS
Motherboard
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| Motherboard
accepts all of the
above
board thru
0.1inch
header
receptacle
in
addition
to a 2X16
LCD. It
also has
a 5V
regulator,
an opto
isolator
(4N33S)
and two
connectors. |
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wait a
while!!
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LCD
Display
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LCD
Display which
fits on a motherboard
is a 2X16 character
from
Hantronix
having an
HD 47****
controller
chip to
display
frequency
& menu
functions.
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| Schematics
of the DDS Project: |
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0-40MHZ
DDS BOARD
V.1 |
JPG |
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40-70MHZ
DDS BOARD
V.2 |
JPG |
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PIC
16F628
BOARD |
JPG |
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DDS
Motherboard |
JPG |
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4
X 3
Keyboard |
JPG |
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7
X 1
Function
Keyboard |
JPG |
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Tech Doc, Parts List &
Firmware
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DDS
Board V1
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DDS
Board V2
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PIC
Board
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PIC16F628A
Firmware Hex
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Firmware
Functions
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