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FM Radio with RDS

A top HAT project for the Raspberry Pi

FM Radio with RDS
FM Radio with RDS
Labs Project
Based on a Labs project | February 2018 | Find it here
A Raspberry Pi plus a homebrew HAT with driver software and a custom graphical user interface created especially for this application combine to make a unique FM radio that is not only eye-catching but a fascinating learning experience, thanks to extensively detailed documentation. Nobody can fail to learn something new from this wide-ranging project!

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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.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Component list

Component List

Resistors

R1-R6 = 3.9kΩ 0.125W 1%, SMD 0805

R7-R10 = 100Ω 0.125W 1%, SMD 0805

 

Capacitors

C1 = 10µF 16V, 20%, 5mm radial SMD, 0.03Ω/2.2A

C2-C8,C17 = 100nF 50V, 10%, X7R, SMD 0805

C10 = 1nF 50V, 10%, X7R, SMD 0603

C11 = 470nF 16V, 10%, X7R, SMD 0603

C12-C15 = 470pF 50V, 5%, C0G/NP0, SMD 0805

C16 = 10pF 50V, ±0.5pF, C0G/NP0, SMD 0805, not fitted

 

Inductors

L1 = SLF7032T102MR13-2PF, 1mH @100kHz, 130mA, 4.78Ω (TDK)

L2 = LQW18ANR27G00D, 270nH @100MHz, 110mA, 3.4Ω (Murata)

L4-L7 = BLM18PG471SN1D, 470Ω @100MHz, 1A, 0.2Ω (Murata)

 

Semiconductors

D1 = CM1213A-01SO, SMD SOT-23 (ON Semiconductor)

IC1 = TSOP4138, 3-pin, wired (Vishay)

IC2 = SI4731-D60-GM, SMD 20-pin, QFN (Silicon Labs)

IC3 = CAT24C64WI-GT3, SOIC-8 (ON Semiconductor)

IC4 = SSM2518CPZ, LFCSP 20-pin -WQ (Analog Devices)

IC5 = CS2300-CP-CZZ, MSOP-10 (Cirrus Logic)

 

Miscellaneous

K2,K3 = 2-way PCB screw terminal block, 3.5mm pitch

J8 = 40-way (2×20) GPIO receptacle strip for RPi (extra long)

4 pcs standoff 17mm, M2,5 (male-female), e.g. Ettinger 05.12.173

4 pcs standoff 14mm, M2,5 (male-female), e.g. Ettinger 05.12.143

5 pcs M2.5 nut

5-pin SIL pinheader, vertical, 0.1'' pitch, distributed for AM/FM/PW pads

J8 = 3.5" touchscreen-LCD, e.g. Waveshare 3.5inch RPi LCD (A)

Raspberry Pi Model 2 or up

PCB # 160520-1 v2.0

 

C9,L3,K1: not fitted

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