4 layers50 × 50 mm
Radmatrix
radex/radmatrix
Tiny modular LED matrix. NOTE: Moved to https://code.hackerspace.pl/radex/radmatrix
198 parts2
2 layers99.8 × 49.8 mm
LedArrayDemo
radex/radmatrix2Tiny modular LED matrix. NOTE: Moved to https://code.hackerspace.pl/radex/radmatrix
- Size
- 99.8 × 49.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 453
- Nets
- 58
- Pads
- 943
- Tracks, vias
- 246, 488
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 Mar 2024
- Updated
- 26 Jul 2025
Overview
LedArrayDemo is an open-source printed circuit board by radex, from the radex/radmatrix repository on GitHub. It is a 2-layer board of 99.8 × 49.8 mm with 453 parts on 58 nets, routed with 246 tracks and 488 vias.
It is built around the 74HC595D,118, ULN2003ADRG and XL-1608SURC-06, with the HL2301A and HL2304 among its other parts. Its parts include 400 diodes, 10 connectors, 8 transistors, 5 capacitors and 4 resistors. It belongs with the lEDs and displays boards of this library.
Main components
5
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 RegistersULN2003ADRG
SOP-16SOP-16 Darlington Transistor Arrays ROHSQNHDarlington Transistor Arrays
XL-1608SURC-06
0603-40℃~+85℃ 120° 2.3V 20mA 225mcd 50mW 620nm~630nm 625nm Discrete Diode Red Top-mount Water Clear 0603 LED Indication - Discrete ROHSXINGLIGHTLED Indication - Discrete
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
453| Qty | Value | Footprint | References |
|---|---|---|---|
| 400 | XL-1608SURC-06 | LED_SMD:LED_0603_1608Metric_Dot | D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1 +384 |
| 18 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18 +2 |
| 6 | , , , , , | ||
| 4 | 10k | PCM_Resistor_SMD_AKL:R_0603_1608Metric_Pad0.98x0.95mm | R1, R2, R3, R4 |
| 4 | 22u | Capacitor_SMD:C_0805_2012Metric | C2, C3, C4, C5 |
| 4 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4, J5, J7, J8 |
| 4 | HL2301A | PCM_Package_TO_SOT_SMD_AKL:SOT-23 | Q2, Q6, Q7, Q8 |
| 4 | HL2304 | PCM_Package_TO_SOT_SMD_AKL:SOT-23 | Q1, Q3, Q4, Q5 |
| 3 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3, J9, J10 |
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 74HC595D,118 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J6 |
| 1 | Conn_01x07_Pin | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J2 |
| 1 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1 |
| 1 | ULN2003ADR | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U2 |
Questions
How big is the LedArrayDemo PCB?
It measures 99.8 × 49.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LedArrayDemo use?
453 parts, built around the 74HC595D,118, ULN2003ADRG, XL-1608SURC-06 and HL2301A. 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 LedArrayDemo KiCad files?
From the radex/radmatrix repository on GitHub, at the commit this page was made from: the board is pcb/DemoBoard1/LedArrayDemo.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 LedArrayDemo 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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