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

The blue speaker bezel is cutfrom a Kraft Miracle Whip lid.

©2014Lennie Zink