4 layers52 × 40 mm
Swift usbc-3a
Senyeah/12v-to-usb-c-data-splitter
Car 12 V to USB-C 5 V 3 A (15 W) charger that passes the stereo's USB data through to the phone. KiCad 10, JLCPCB-ready.
48 partsCERN-OHL-S-2.0
6 layers83.5 × 99.4 mm
TAPRx888
TAPR/TAPRx8886The TAPR rx888 replacement board project
- Size
- 83.5 × 99.4 mm
- Copper layers
- 6
- Thickness
- 1.56 mm
- Parts
- 225
- Nets
- 210
- Pads
- 870
- Tracks, vias
- 1,774, 672
- Pours
- 33
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 May 2026
- Updated
- 31 Oct 2026
Overview
TAPRx888 is an open-source printed circuit board by TAPR, from the TAPR/TAPRx888 repository on GitHub, published under the MIT licence. It is a 6-layer board of 83.5 × 99.4 mm with 225 parts on 210 nets, routed with 1,774 tracks and 672 vias.
It is built around the CYUSB3014-BZXCT, SN65LVDS1D and AD8370ARE, with the LTC2208CUP#PBF, MX25L3233FM2I-08G and BAV99 among its other parts. Its parts include 78 capacitors, 61 resistors, 22 ICs, 17 inductors and 11 connectors. It belongs with the radio and wireless boards of this library.
Main components
12
CYUSB3014-BZXCT
BGA-121_10X10mmBGA-121_10X10mm New Arrivals ROHSInfineon TechnologiesMicrocontrollers (MCU/MPU/SOC)
SN65LVDS1D
SOIC-8-40℃~+85℃ 1 1 2.4V~3.6V 630Mbps Transceiver SOIC-8 LVDS ICs ROHSTexas InstrumentsLVDS ICs
AD8370ARE
TSSOP-16-EP-40℃~+85℃ 1 3V~5.5V 77dB 79mA 900nA Differential VGA TSSOP-16-EP Programmable / Variable Gain Amplifiers (PGA/VGA) ROHSAnalog DevicesOperational AmplifierLTC2208CUP#PBF
QFN-64(9x9)QFN-64(9x9) Analog to Digital Converters (ADC) ROHSAnalog DevicesUncategorised
MX25L3233FM2I-08G
SOP-8-208mil-40℃~+85℃ 1.2ms 100,000 cycles 133MHz 2.65V~3.6V 20 Years 250ms@(64KB) 32Mbit Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOP-8-208mil NOR FLASH ROHSMXICFLASH
BAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching Diodes
AP2114H-3.3TRG1
SOT-223-40℃~+85℃@(Ta) 1 1A 3.3V 30uVrms 450mV@(1A) 65dB@(1kHz) 65uA 6V Fixed Over Current Protection、Over Temperature Protection Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LP5907MFX-3.3
SOT-23-5-40℃~+125℃@(Tj) 1 10uVrms 12uA 250mA 250mV@(250mA) 3.3V 5.5V 82dB@(1kHz) Fixed Positive Short Circuit Protection、Thermal shutdown、Enable control、Input under-voltage protection、Output discharge SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
NC7SV157P6X
SC-70-6-40℃~+85℃ 0.9uA 1.5ns@3.3V,15pF 2/1 24mA 24mA 900mV~3.6V Multiplexer Output enable high-impedance、Power-off protection、Tri-state output Single Supply SC-70-6 Signal Switches, Multiplexers, Decoders ROHSonsemiSignal Switches, Multiplexers, Decoders74LVC2G14GW
SC-70-6(SOT-363)-40℃~+125℃ 1.5V~3.6V 1.65V~5.5V 2 2 250mV~1.2V 32mA 32mA 4.7ns@5V,50pF 4uA 74LVC Schmitt trigger 电源关断保护、噪声抑制功能 SC-70-6(SOT-363) Inverters ROHSNexperiaInverters
SI5351A-B-GT
MSOP-10-40℃~+85℃ 1.71V~3.6V 200MHz 3 I2C MSOP-10 Clock Generators, PLLs, Frequency Synthesizers ROHSSilicon LabsClock Generators, PLLs, Frequency SynthesizersTLV3501AID
SOIC-8-2.75V~-1.35V、1.35V~2.75V -40℃~+125℃ 1 1mV 2.7V~5.5V 2pA 2pA 3.2mA 4.5ns 5.5V 55dB 6mV Enable/shutdown function、Overvoltage protection Push-pull Rail-to-Rail Input, Rail-to-Rail Output TTL、CMOS SOP-8 Comparators ROHSTexas InstrumentsComparators
README
README.mdTAPRX-888
A simplified, HF-only software-defined radio (SDR) receiver based on the RX-888 — with improved thermal and RF layout.
The KiCad project lives at the repository root (TAPRX-888.kicad_pro /
.kicad_sch / .kicad_pcb). KiCad 10.0 is the project baseline.
Features
- HF-only — no VHF downconverter
- Larger PCB, 6-layer
- 0603 passive components
- Improved thermal layout
- Improved RF alias filter
- RF shelving filter (bypassable)
- External reference clock input, auto-switching
- Attenuated filter-bypass injector port (used for timesync)
- Support use of a SPI boot EEPROM, with option for USB-only or SPI boot w/ USB fallback
Please see the schematic and layout documents for details.
Core devices
| Function | Part |
|---|---|
| ADC | LTC2208 (16-bit) |
| Clock generator | Si5351 |
| USB3 controller | EZ-USB FX3 (CYUSB301x) |
| SPI boot flash | MX25L3233F |
Mechanicals and Enclosure Design
The project ships its own mechanical package: a JLCMC split-aluminium enclosure (88 × 38 x 100 mm) with two custom PCB end plates and M3 mounting hardware.
The board's exported STEP is the EE↔ME interface; CI assembles enclosure + board + both plates into a coloured 3D model with a self-contained browser viewer (https://tapr.github.io/TAPRx888/). See mechanical/README.md for the enclosure spec, plate geometry, and fit-check flow.
Repository & workflow
The KiCad project is at the repo root. Design/PCB, mechanical, and end-plate work
happens on the design branch (one person at a time — KiCad layout files
can't be merged); docs, CI, and tooling go on dev-* branches; flow is
design → dev → main. See CONTRIBUTING.md for how we
collaborate and docs/RELEASE_STRATEGY.md for
branches, CI, and versioning.
Releases
CI publishes version-stamped fabrication/design packages as GitHub Releases; the
dev v0.x pre-releases also bundle the end plates, the 3D enclosure assembly,
and a live viewer (https://tapr.github.io/TAPRx888/). Grab the latest from
the Releases page; see
docs/RELEASE_STRATEGY.md for details.
Documentation
- mechanical/README.md — the enclosure & end-plate package (geometry, fit-check CI, 3D viewer)
- CONTRIBUTING.md — how we collaborate (the two-lane
design/ infra flow, the design baton) - docs/RELEASE_STRATEGY.md — versioning, CI, and how releases are cut
- docs/AI_REVIEW.md — using AI review responsibly; read this before pointing an AI tool at the design
- docs/EMERGENCY_ROLLBACK.md — the parachute: how to turn the CI/branch machinery off if it's ever too much
Reference documents
Device datasheets (LTC2208, Si5351, EZ-USB FX3, MX25L3233F) and RX888 reference material are on the project wiki → Reference Documents.
Parts
225| Qty | Value | Footprint | References |
|---|---|---|---|
| 49 | C-0.1-0603 | Library:C_0603 | C1, C2, C3, C10, C15, C16, C17, C18, C19, C20, C21, C23, C24, C26, C27, C28 +33 |
| 17 | TP | Library:TP | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP10, TP13, TP14, TP15, TP16, TP17, TP18, TP19 +1 |
| 8 | FBEAD0603-1u-190mA | Library:0603 | L1, L4, L5, L6, L7, L15, L16, L17 |
| 6 | C-10u-0603 | Library:C_0603 | C11, C12, C13, C14, C29, C65 |
| 6 | R-0Ω-0603 | Library:PAD_0603 | R18, R19, R20, R21, R22, R23 |
| 6 | R-10K-0603 | Library:PAD_0603 | R46, R47, R51, R52, R55, R60 |
| 6 | R-1K-0603 | Library:PAD_0603 | R15, R16, R17, R25, R26, R27 |
| 6 | R-51Ω-0603 | Library:PAD_0603 | R28, R30, R31, R35, R36, R39 |
| 5 | R-100-0603 | Library:PAD_0603 | R40, R41, R42, R43, R61 |
| 4 | BAV99 | Library:SOT-23 | U12, U13, U15, U17 |
| 4 | C-22u-0603 | Library:C_0603 | C22, C41, C45, C47 |
| 4 | CONN_SMA_JACK_EDGE_JLC_With_Nut | Library:SMA_Jack_EdgeMount_JLC_With_Nut | J1, J2, J3, J4 |
| 4 | Conn_01x03 | Library:Pin_Header_Straight_1x03_Pitch2.54mm | J6, J7, J8, J9 |
| 4 | R-2.2K-0603 | Library:PAD_0603 | R29, R34, R53, R54 |
| 4 | R-22 0402x4 | Library:4D02 | R9, R10, R11, R12 |
| 4 | ~ | Library:MountingHole_M2.5-PTH | H1, H2, H3, H4 |
| 3 | AP2114H-3.3TRG1 | Library:SOT-223_THERMAL | U1, U2, U3 |
| 3 | C-1u-0603 | Library:C_0603 | C4, C25, C62 |
| 3 | R-1M-0603 | Library:PAD_0603 | R44, R49, R50 |
| 3 | R-22Ω-0603 | Library:PAD_0603 | R8, R56, R57 |
| 3 | R-4.7-0603 | Library:PAD_0603 | R1, R4, R5 |
| 2 | C-330p-0603 | Library:C_0603 | C52, C57 |
| 2 | C-4.7p-0603 | Library:C_0603 | C30, C31 |
| 2 | C-56p-0603 | Library:C_0603 | C50, C61 |
| 2 | C-68p-0603 | Library:C_0603 | C55, C58 |
| 2 | Inductor-120n-1008 | Library:Murata2U | L10, L11 |
| 2 | Inductor-150n-1008 | Library:Murata2U | L13, L14 |
| 2 | Inductor-820n-1008 | Library:Murata2U | L9, L12 |
| 2 | LP5907MFX-3.3 | Library:SOT-23-5 | U4, U14 |
| 2 | NC7SV157 | Library:SC-70-6 | U18, U21 |
| 2 | PMOS Si2343DS | Library:SOT-23 | Q1, Q3 |
| 2 | R-100K-0603 | Library:PAD_0603 | R6, R24 |
| 2 | R-10Ω-0603 | Library:PAD_0603 | R33, R38 |
| 2 | R-220Ω-0603 | Library:PAD_0603 | R32, R37 |
| 2 | R-330Ω-0603 | Library:PAD_0603 | R45, R48 |
| 2 | R-47K-0603 | Library:PAD_0603 | R58, R59 |
| 2 | R-47Ω-0603 | Library:PAD_0603 | R2, R3 |
| 2 | Schottky_Pwr_B5819W | Library:SOD-123 | D1, D2 |
| 2 | TP | Library:TP-Tiny | TP11, TP12 |
| 2 | TP-TINY | Library:TP-Tiny | TP20, TP21 |
| 1 | 74LVC2G14 | Library:SC-70-6_rot90 | U19 |
| 1 | AD8370 | Library:TSSOP-16-Thermal | U6 |
| 1 | BUTTON-4p5X4p5 | Library:BUTTON-4p5X4p5 | B1 |
| 1 | C-100p-0603 | Library:C_0603 | C60 |
| 1 | C-10u-50V-1206 | Library:PAD_1206 | C33 |
| 1 | C-12p-0603 | Library:C_0603 | C51 |
| 1 | C-22p-0603 | Library:C_0603 | C59 |
| 1 | C-39p-0603 | Library:C_0603 | C54 |
| 1 | C-47p-0603 | Library:C_0603 | C56 |
| 1 | C-8.2p-0603 | Library:C_0603 | C78 |
| 1 | C-82p-0603 | Library:C_0603 | C53 |
| 1 | CYUSB3014-BZXCT | Library:BGA-121 | U11 |
| 1 | Conn_JTAG10-mini | Library:CONN-JTAG10-mini | J11 |
| 1 | FBEAD0603_2A | Library:0603 | L3 |
| 1 | Inductor-180n-1008 | Library:Murata2U | L8 |
| 1 | LED_RGB_SIDE | Library:LED_RGB_SIDE | D3 |
| 1 | LOGO | Library:HamSCI-25mm | G*** |
| 1 | LOGO | Library:TAPR 10mm | G*** |
| 1 | LTC2208CUP#PBF | Library:QFN-64_EP_9.5x9.5_Pitch0.5mm | U8 |
| 1 | MMBT3904 | Library:SOT-23 | Q2 |
| 1 | MX25L3233FM2I | Library:SOIC-8-dual | U9 |
| 1 | PESD5V0U1UA | Library:SOD-323 | Z1 |
| 1 | R-2.0K-0603 | Library:PAD_0603 | R7 |
| 1 | R-200-0603 | Library:PAD_0603 | R14 |
| 1 | R-6.04K-0603 | Library:PAD_0603 | R13 |
| 1 | SN65LVDS1 | Library:SOT-23-5 | U22 |
| 1 | Si5351A | Library:MSOP-10_W3mm | U20 |
| 1 | TCXO-27M | Library:TCXO-3225 | X1 |
| 1 | TIS_LOGO | Library:TIS-Logo | L2 |
| 1 | TLV3501 | Library:SOT-23-6 | U16 |
| 1 | TVS-SP3011 | Library:SP3011 | U7 |
| 1 | U.FL-R | Library:HRS_U.FL-R-SMT(01) | J10 |
| 1 | UMW AMS1117-1.2 | Library:SOT-223_THERMAL | U5 |
| 1 | USB-3.0 | Library:USB-3.0 | J5 |
| 1 | XO-19.2MHZ | Library:SMD-2520 | U10 |
Questions
How big is the TAPRx888 PCB?
It measures 83.5 × 99.4 mm and has 6 copper layers, 1.56 mm thick.
What parts does the TAPRx888 use?
225 parts, built around the CYUSB3014-BZXCT, SN65LVDS1D, AD8370ARE and LTC2208CUP#PBF. 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 TAPRx888 KiCad files?
From the TAPR/TAPRx888 repository on GitHub, at the commit this page was made from: the board is TAPRX-888.kicad_pcb and its schematic Front_End.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TAPRx888 design in my own project?
Its repository publishes it under the MIT 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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