Build Your Own DRM Receiver
A digital radio for 500 kHz to 22 MHz
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Extra info / Update
Component list
R1 = 3kOhm 9
R2 = 680Ohm
R3 = 330Ohm
R4 = 180Ohm
R5 = 39Ohm Ohm
R6,R13 = 100kOhm
R7,R9 = 100Ohm
R8,R10 = 2kOhm 2
R11 = 220kOhm
R12 = 1kOhm
R14 = 3kOhm 3
R15,R16 = 560kOhm
R17 = 27kOhm
R18 = 220kOhm
Capacitors:
C1-C4 = 100nF, SMD, case shape 1208
C5,C6 = 15pF
C7,C8,C11,C14,C17,C23,C24,C25 = 100nF, lead pitch 5mm
C9 = 1nF8, lead pitch 5mm
C10 = 3nF3, lead pitch 5mm
C12,C13,C21 = 4µ F7 16V radial
C15,C16 = 470pF
C18,C19 = 1nF, lead pitch 5mm
C20 = 4nF7, lead pitch 5mm
C22 = 470nF
Inductors
L1 = 3µ H3
L2 = 10µ H
L3 = 100µ H
Semiconductors:
D1 = 1N4001
T1,T2 = BF494
T3 = BC548C, BC549C or BC550C
T4 = BF245C
IC1 = MC1489N
IC2 = AD9835 BRU (Analog Devices)
IC3 = LM358N
IC4 = 7805
IC5 = 50MHz oscillator module in 8-way or 14-way DIP case
Miscellaneous:
K1 = 9-way sub-D socket (female), angled pins, PCB mount
K2 = 2 solder pins
K3 = mains adapter socket
K4 = cable with 3.5-mm mono or stereo jack plug
MIX1 = TUF-1 (Mini Circuits)
FL1 = CFW455F (455kHz ceramic filter, bandwidth 12kHz) (Murata)
X1 = CSB470 (470kHz ceramic resonator) (Murata)
RS232 cable with 1:1 pin connections, plug and socket, no zero-modem or crossed wire cable.
PCB, order code 030365-1
Disk, PC software DRM.exe, order code 030365-11 or Free Download
Suggested component / kit suppliers:
- Geist Electronic (www.geist-electronic.de)
- Segor electronics (www.segor.de).
- AK Modul Bus (www.ak-modul-bus.de)
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