2 layers99.8 × 49.8 mm
LedArrayDemo
radex/radmatrix
Tiny modular LED matrix. NOTE: Moved to https://code.hackerspace.pl/radex/radmatrix
453 parts2
2 layers50 × 50 mm
LedArrayMux
radex/radmatrix2Tiny modular LED matrix. NOTE: Moved to https://code.hackerspace.pl/radex/radmatrix
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 178
- Nets
- 135
- Pads
- 410
- Tracks, vias
- 977, 321
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 Mar 2024
- Updated
- 26 Jul 2025
Overview
LedArrayMux is an open-source printed circuit board by radex, from the radex/radmatrix repository on GitHub. It is a 2-layer board of 50 × 50 mm with 178 parts on 135 nets, routed with 977 tracks and 321 vias.
It is built around the 74HC595D,118, HL2301A and HL2304. Its parts include 100 resistors, 40 transistors, 7 capacitors and 3 ICs. It belongs with the lEDs and displays boards of this library.
Main components
3
74HC595D,118
SOIC-16-40℃~+125℃ 1 100MHz 19ns@4.5V,50pF 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOIC-16 Shift Registers ROHSNexperiaShift Registers
HL2301A
SOT-23-55℃~+150℃ 1 P-Channel 2.3A 20V 3.3nC@2.5V、5.5nC@4.5V 405pF 55pF 700mV 700mW 75pF 90mΩ@4.5V、110mΩ@2.5V P-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsHL2304
SOT-23-55℃~+150℃ 1 N-channel 1.5V 17pF 1W 234pF 3.6A 30V 37mΩ@10V、57mΩ@4.5V 6.08nC@10V N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
README
pcb/MainBoard/README.mdMain Board
50x50mm microcontroller module, driving LedArrayMux modules. Contains an RP2040 microcontroller, a CAN transceiver, PWM audio output, current sensing, and level shifters to work around LedArrayMux bugs.
Revisions
Rev A
Errata:
- Level shifters are too slow to be useful
- Workaround: decrease pullup values to obnoxiously low ones (100-180Ω); do not use level shifters; increase PIO delays until functional
- CAN receive signal is not level shifted, which exposes RP2040 to a 5V signal
- Workaround: Do nothing; replace with a 3v3 CAN transceiver
- The 431 shunt voltage reference does not work correctly
- Workaround: use main 3v3 regulator for vref
- PWM audio signal filter is suspected to be responsible for poor quality audio
Parts
178| Qty | Value | Footprint | References |
|---|---|---|---|
| 40 | 100R | Resistor_SMD:R_0402_1005Metric | R3, R10, R12, R14, R16, R18, R20, R22, R24, R26, R28, R30, R32, R34, R36, R38 +24 |
| 40 | 10k | Resistor_SMD:R_0402_1005Metric | R4, R11, R13, R15, R17, R19, R21, R23, R25, R27, R29, R31, R33, R35, R37, R39 +24 |
| 24 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19, TP20, TP21, TP22, TP23 +8 |
| 20 | 150R | Resistor_SMD:R_0805_2012Metric | R89, R90, R91, R92, R93, R94, R95, R100, R101, R102, R103, R104, R105, R106, R107, R108 +4 |
| 20 | HL2301A | PCM_Package_TO_SOT_SMD_AKL:SOT-23 | Q2, Q3, Q4, Q5, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21 +4 |
| 20 | HL2304 | PCM_Package_TO_SOT_SMD_AKL:SOT-23 | Q1, Q22, Q23, Q24, Q25, Q26, Q27, Q28, Q29, Q30, Q31, Q32, Q33, Q34, Q35, Q36 +4 |
| 4 | , , , | ||
| 3 | 100n | Resistor_SMD:R_0402_1005Metric | C1, C2, C7 |
| 3 | 22uF | Capacitor_SMD:C_1206_3216Metric | C4, C101, C102 |
| 3 | 74HC595D,118 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U1, U2, U7 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C6 |
Questions
How big is the LedArrayMux PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LedArrayMux use?
178 parts, built around the 74HC595D,118, HL2301A and HL2304. 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 LedArrayMux KiCad files?
From the radex/radmatrix repository on GitHub, at the commit this page was made from: the board is pcb/LedArrayMux/LedArrayMux.kicad_pcb and its schematic pcb/DemoBoard1/LedArrayDemo.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LedArrayMux design in my own project?
Its repository states no licence, so its author keeps all rights: ask radex before reusing the design.
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