Let's build Soft66DB2


Parts


Block image

Schematic(click for enlarge)

1st winding troid core.

BPF for 7Mband.please see datail Soft66DB.
3.5M
7M(WIDE)

7M(narrow)

T2 41T(T30-2red)
L1,L4 19T(T30-2red)
C7,C15= 1000pF C16,C17= 470pF
C11=220pF C10=100pF

T2 　33T(T30-6,yellow)、30T(T30-2,red)
L1,L4　　bifiler14T　(T30-6,yellow)、12T(T30-2,red)
C7,C15= 220pF C16,C17= 680pF
C11=120pF C10=0pF

T2 　45T(T30-6,yellow)
L1,L4　　bifiler10T　(T30-6,yellow)
C7,C15= 1000pF C16,C17= 470pF
C11=68pF C10=0pF

14M
21M

T2 　42T(T30-6,yellow)
L1,L4　　bifiler5T　(T30-6,yellow)
C7,C15= 1000pF C16,C17= 220pF
C11=20pF C10=0pF

T2 　30T(T30-6,yellow)
L1,L4　　bifiler4T　(T30-6,yellow)
C7,C15= 1000pF C16,C17= 0pF
C11=10pF C10=0pF


L1,L4 winding bifiler
L and T position.click for enlarge.

2nd soldering parts.

caution! It is too hard to resolder parts on thru hole.
You should be careful of part arrangement .

C1,C12,C13,C6 has polar side.There is no mark on PCB.
Please see details .
click for enlarge.

Do not forget solder jumper ON under Q1.
This solder jumper must be OFF when DDS-33 connected.
click for enlarge.

3rd check !

Please figure out the resistance of V+ and GND.
It will be OK if resistance is more than 30 ohms or it.
Soft66DB2 needs 7V to 20V DC power.

4th connect PC and ANT

Please Connect ANT to RF input .plug jack to Line IN of Sound Card.
And you need download Rocky or SDRadio.

If your Soft66DB2 have only one BPF,please check here.

Partlist

C1

10uF

Tantalum capacitor has polar.+ mark is plus.
please turn the lead of plus to 4066 side.

C2,C3,C4,C5,C8,C14

0.1uF

C7,C16,C15,C17

see BPF

C10,C11

see BPF

C21,C22,C20,C24

option

C9,C23

option

C12,C13

2.2uF

Tantalum capacitor has polar.+ mark is plus.
please turn the lead of plus to 2068 side.

may be this type included

C32,C33

330pF

D1

diode

IC1

74AC74

IC2

78L05

IC4

74VHC4066

IC5

74AC04

IC6

NJM2068D

L1,L2,T1

T30-2(default)

T30-6(7M narrow)

L3,L4,T2

option

Q1

28.224MHz Crystal HC49/US

R2

1M

R4,R7

2.2k

R5,R6

5.1k

Audio Jack

for output

UEW

for BPF

Wire

for DC power

14pin IC socket

for 74AC04

C6

47uF

white side is -.
please turn the lead of plus to 74AC04 side.

C18,C19

18pF(or10pF)

Detailes　

If you select single
BPF,jumper one section
for more sensitive.