2 layers80.7 × 38.5 mm
2 layers55 × 25 mm
Headless tef lite
FMDX-org/headless-tef-lite10Small low cost Headless TEF variant.
- Size
- 55 × 25 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 97
- Nets
- 94
- Pads
- 358
- Tracks, vias
- 477, 138
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 7 May 2025
- Updated
- 9 Jun 2025
Overview
Headless tef lite is an open-source printed circuit board by FMDX-org, from the FMDX-org/headless-tef-lite repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 55 × 25 mm with 97 parts on 94 nets, routed with 477 tracks and 138 vias.
It is built around the STM32F072CBU6, TPS7A2033PDBVR-TP and USBLC6-2P6, with the 12402012E212A, 36903205S and ACM2012-202-2P-T002 among its other parts. Its parts include 35 capacitors, 25 resistors, 5 diodes, 5 inductors and 4 ICs. It belongs with the radio and wireless boards and the STM32 boards of this library.
Main components
8
STM32F072CBU6
UFQFPN-48(7x7)-40℃~+85℃ 1.65V~3.6V 128KB 12bit 12bit 16KB 32 Bit 37 48MHz ARM Cortex-M0 Built-in FLASH UFQFPN-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
TPS7A2033PDBVR-TP
SOT-23-5-40℃~+85℃ 1 180uV@(300mA) 2uA 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Current Protection、Enable、Thermal Shutdown Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICUncategorised
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)12402012E212A
SMD1 5A Female Type-C USB 2.0 SMD USB Connectors ROHSAmphenolUSB Connectors
36903205S
-- Connector Housings ROHSWürth ElektronikConnector Housings
ACM2012-202-2P-T002
SMD-4P,2x1.2mm-40℃~+85℃ 150mA 2 2.5Ω 2kΩ@100MHz 50V 50V SMD-4P,2x1.2mm Common Mode Filters ROHSTDKCommon Mode Filters
BAV99S
SOT-3631.25V@150mA 150mA 1uA@75V 2 Pair Series Connection 2.5A 200mW 6ns 85V SOT-363 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching Diodes
CPDV3V3A-HF
SOD-323-55℃~+125℃ 0.6pF 1 200nA 20V 3.3V 400W@8/20us 4V IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 TVS SOD-323 ESD and Surge Protection (TVS/ESD) ROHSLeiditechESD And Surge Protection (TVS/ESD)
README
README.mdTEF668X Headless Lite USB Tuner
USB radio tuner based on the STM32F072 MCU and TEF668X/V205 RF receiver with digital audio output over USB. This is the lite variant of our Headless USB tuner. It is more compact, with a simplified RF input path and only one antenna input for AM/FM.
This design is optimized as a cost-efficient solution tailored for automated PCBA (Printed Circuit Board Assembly) processes.
Copyright (C) 2025 FMDX.org
You may redistribute and modify this source under the terms of the CERN-OHL-W v2 (see LICENSE file).
Credits
- Konrad Kosmatka - HW & FW architecture and development
- Sjef Verhoeven - HW development
- Marek Kraus - HW & FW prototyping
- Marek Farkaš - testing and integration with FM-DX Webserver
- Przemysław Korpas - HW consultation, reviews
- Sebastian Białkowski - HW consultation, reviews
Firmware
The firmware is available in a separate repository: FM-DX-Tuner.
Firmware dependencies:
- Board: STM32 MCU Based Boards (STM32duino) - download using board manager
- Library: TinyUSB - install manually to the Arduino libraries
During first firmware flashing, short BOOT to 3.3V, plug the USB cable and flash using Arduino IDE (DFU method). Once the firmware is running, it is not necessary to manually short BOOT pin. See tef-bootloader.
Audio output
The baseline version of the tuner supports only digital audio over USB. You can access analog audio via the L and R solder points, but this output is unbuffered. Therefore, you will need to build an additional electronic circuit to achieve proper audio output.
Important remarks
- TEF6687/V205 (F8705) chip is recommended for the best performance (FMSI, FULL SCAN RDS).
- RF circuits should contain NP0 (C0G) capacitors.
- Only V205 version of TEF668X are supported on this design!
- All capacitors and resistors are 0402.
Parts
97| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 100n | Capacitor_SMD:C_0402_1005Metric | C10, C11, C13, C14, C15, C19, C23, C24, C25, C26, C27, C30, C33 |
| 9 | 100R | Resistor_SMD:R_0402_1005Metric | R6, R8, R9, R10, R11, R16, R17, R19, R20 |
| 7 | 5K1 | Resistor_SMD:R_0402_1005Metric | R1, R2, R7, R12, R13, R14, R18 |
| 7 | ~ | TestPoint:TestPoint_Pad_D1.0mm | TP3, TP4, TP5, TP6, TP7, TP8, TP9 |
| 4 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C18, C22, C28, C32 |
| 4 | FERRIT | Inductor_SMD:L_0402_1005Metric | FB1, FB2, FB3, FB4 |
| 3 | 10u | Capacitor_SMD:C_0402_1005Metric | C9, C20, C29 |
| 3 | 12p | Capacitor_SMD:C_0402_1005Metric | C17, C31, C35 |
| 3 | 1M | Resistor_SMD:R_0402_1005Metric | R3, R4, R5 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R24, R25 |
| 2 | 1n | Capacitor_SMD:C_0402_1005Metric | C5, C21 |
| 2 | 1p | Capacitor_SMD:C_0402_1005Metric | C8, C12 |
| 2 | 270nH | Inductor_SMD:L_0402_1005Metric | L3, L4 |
| 2 | 2K | Resistor_SMD:R_0402_1005Metric | R21, R22 |
| 2 | LOGO | Library:Headless_TEF_lite_text | G***, G*** |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C16 |
| 1 | 10p | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | 12402012E212A | Library:12402012E212A | J1 |
| 1 | 1n5 | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 1p8 | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | 220n | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 220nH | Inductor_SMD:L_0402_1005Metric | L5 |
| 1 | 2k | Resistor_SMD:R_0402_1005Metric | R23 |
| 1 | 3.3uH | Inductor_SMD:L_0402_1005Metric | L2 |
| 1 | 36903205S | Library:36103205S | J3 |
| 1 | 470p | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 4n7 | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 4p7 | Capacitor_SMD:C_0402_1005Metric | C34 |
| 1 | 55.46667 MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 560R | Resistor_SMD:R_0402_1005Metric | R15 |
| 1 | 8 MHz | Crystal:Resonator_SMD_Murata_CSTxExxV-3Pin_3.0x1.1mm | Y2 |
| 1 | 820nH | Inductor_SMD:L_0402_1005Metric | L1 |
| 1 | ACM2012-202-2P-T002 | Library:USB_Filter_0805 | FL1 |
| 1 | BAV99S | Package_TO_SOT_SMD:SOT-363_SC-70-6 | D1 |
| 1 | BLUE | LED_SMD:LED_0402_1005Metric | D5 |
| 1 | CPDV3V3A-HF | Diode_SMD:D_SOD-323 | D2 |
| 1 | GREEN | LED_SMD:LED_0402_1005Metric | D3 |
| 1 | L | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
| 1 | LOGO | Library:openradio | G*** |
| 1 | LOGO | Library:fmdx.org | G*** |
| 1 | R | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | RED | LED_SMD:LED_0402_1005Metric | D4 |
| 1 | SMA | Connector_Coaxial:SMA_Molex_73251-2120_EdgeMount_Horizontal | J2 |
| 1 | STM32F072CBU6 | Package_DFN_QFN:VQFN-48-1EP_7x7mm_P0.5mm_EP4.1x4.1mm_ThermalVias | U3 |
| 1 | TEF6687HN/V205 (F8705) | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm_ThermalVias | U1 |
| 1 | TPS7A2033PDBVR | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U2 |
Questions
How big is the Headless tef lite PCB?
It measures 55 × 25 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Headless tef lite use?
97 parts, built around the STM32F072CBU6, TPS7A2033PDBVR-TP, USBLC6-2P6 and 12402012E212A. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Headless tef lite KiCad files?
From the FMDX-org/headless-tef-lite repository on GitHub, at the commit this page was made from: the board is Kicad/Headless TEF lite.kicad_pcb and its schematic Kicad/Headless TEF lite.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Headless tef lite design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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