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CHARLES
WENZEL
ANT
CHASSIS
GND
SW+12V
BATT
BATT
GND
ALL-BAND RECEIVER
©2014 LENNIE ZINK
ST
RA
IN
RE
FIE
F
CIRCUIT
GROUND PLANE
CIRCUIT
GROUND PLANE
COMPONENT LAYOUT BOTTOM VIEW
CHARLES
WENZEL
ANT
CHASSIS
GND
SW+12V
BATT
BATT
GND
ALL-BAND RECEIVER
©2014 LENNIE ZINK
STRAIN
REFIEF
CIRCUIT
GROUND PLANE
CIRCUIT
GROUND PLANE
C101000 F
25Vµ
B C E
C. 1 F
20 0 µ
R110K
BE
C
VR110K
VOLUMEC1
100pF
R210M
Q12N4401
C. 1 F
30 00 µ
CA
C. 1 F
40 0 µ
R310M
B
E
C
Q22N4401
R41M
R510K
BE
C
Q32N4403
R62.2K R9
2.2K
Q4TIP41
C0 F8
22 µ
R1033Ω
R1110Ω
AUDIOTRANSFORMER
8Ω
C. 1 F
90 0 µ
R7100Ω
R810K
IN11mH
IN21mH
B
CF
522µ
C10 F
7µ
D11N5711
C. 1 F
60 00 µ
©2014Lennie Zink
THE AMAZING ALL-BAND RECEIVER
Designing a PC board for RF receivers can be quite challenging. The first attempt resulted in massiveinstability which could not be corrected. A second attempt provided a good working circuit, thanks to thehelp of Charles. The following techniques were employed:
Input and output sections are kept far away from each other.
Speaker wires are twisted together and routed away from the circuit.
Antenna coaxial shielding is kept very close to the ends of the center conductor.
The circuit ground plane is designed to control the path to ground, keeping the sensitive (input) portionof the circuit farthest away from the ground of the output circuit.
●
●
●
●
● Some components are installed on end to reduce space, and stray signals.
WENZELB
E
C
BCE
R110K
D11N5711
R210M
C1100pF
C2.01µF
R310M
Q12N4401 C3
.001µF
R41M
R510K
Q22N4401
C4.01µF
C522µF
C6.001µF
Q32N4403
R62K2
R7100Ω
R810K
R92K2
Q42N2219AOR TIP41
T1500 :
8
Ω
Ω
R1033Ω
R1110Ω
C8220µF
C9.01µF
SPK18 ohm
C101000µF
C710µF
12V
IN11mH
IN21mH
VR1100K
2N44012N4403
R12301W
Ω
D21N4001
3 TERMINALBARRELPOWERPLUG
RING SW
RING
TIP
SW1
Noton
board
SPEAKERGRILL
TEMPLATE
CUT BETWEENOUTSIDE LINES
OFF
VOLUME
MAX
THE AMAZING
ALL-BAND RF RECEIVER
12 VOLT
200 kHz
ANTENNA
HOBBY
ELECTRONICS
HOBBY
ELECTRONICS
A diode in series witha resistor chargesthe batteries when
externalpower.
,,
connected to
A scrap piece of PCBis glued to the speakeras a battery platform.
©2014Lennie Zink