Venus DR-4020 Assemble Instructions
Text of the manual
DR-4020 DUAL BAND QRP DIGITAL RADIO
Assemble Instructions
The kit consists of two PCBs, one for the control board and the other for the mainboard. All
components on the control board have been installed and tested. There are two integrated
circuits and four crystals on the main board are patch components, and the rest are common
leaded components. It is easy
Components List
QTY
ITEM
Part number
Marks
PCB
1
IC
SA602
Polar
2
IC1、IC2
Resistor
33
2
R5、R6
Resistor
220
1
R8
Resistor
470
1
R7
Resistor
1.2K
1
R9
Resistor
2.2K
2
R1、R2
Resistor
10K
3
R4、R10、R11
Resistor
2.2M
1
R3
diode
1N4148
Polar
4
D2、D3、D4、D5
diode
1N5817
Polar
1
D1
IC
NE5532
Polar
1
IC3
Crystal
4.9152M
4
X1、X2、X3、X4
Resistor row
Monolithic
capacitor
150P（151）
2
C3、C46
Monolithic
capacitor
220P（221）
1
C49
Monolithic
capacitor
330P（331）
1
C51
Monolithic
capacitor
470P（471）
1
C47
Monolithic
capacitor
1000P（102）
3
C26、C50、C52
Ceramic
capacitor
0.01（103）
5
C22、C24、C39、C40、C45
Monolithic
capacitor
0.1（104）
10
C8、C9、C10、C17、C18、C20
C25、
AF transformer 600:600
2
T1、T2
Inductor
10uH
The kit has three inductors that require the user to wind it first:
The inductor L8 is wound with a yellow enamel wire 10 turns, and the inductor L9 is wound with a red enamel 12
turns, see photo.
The T3 transformer is an 8:2 transformer with a primary red envelope wrapped around 8 turns, a secondary with a
yellow enameled wire wound around 2 turns, and a pr
