4 layers49 × 68.4 mm
ElectronULA
adbsolutions/ElectronULA
Project to create replacement ULA board for Acorn Electron
89 parts17GPL-3.0
4 layers49 × 75 mm
ElectronULA
adbsolutions/ElectronULA17Project to create replacement ULA board for Acorn Electron
- Size
- 49 × 75 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 164
- Pads
- 427
- Tracks, vias
- 1,382, 184
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 4 May 2020
- Updated
- 27 Sep 2025
Overview
ElectronULA is an open-source printed circuit board by adbsolutions, from the adbsolutions/ElectronULA repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 49 × 75 mm with 44 parts on 164 nets, routed with 1,382 tracks and 184 vias.
It is built around the 74HCT125DB, 74LVC4245APW and MIC7221YM5-TR, with the BAT54 among its other parts. Its parts include 14 capacitors, 11 resistors, 11 ICs, 3 connectors and 1 diode.
Main components
4
74HCT125DB
SSOP-14-208mil-40℃~+125℃ 160uA 38ns@4.5V,50pF 4 4.5V~5.5V 6mA 6mA 74HCT TTL-compatible CMOS Tri-State Unidirectional SSOP-14-208mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
74LVC4245APW
TSSOP-24-40℃~+125℃ 1 1.5V~3.6V 1.5V~5.5V 8 Bidirectional Power-off protection、Output enable high-impedance TTL TTL Tri-State TSSOP-24 Translators, Level Shifters ROHSNexperiaTranslators, Level Shifters
MIC7221YM5-TR
SOT-23-5-40℃~+85℃ 0.25pA 0.5pA 1 12V 1uV/℃ 2.2V~10V 2mV 5us 5us 70dB 7uA Open-drain Rail-to-rail input SOT-23-5 Comparators ROHSMicrochip TechnologyComparators
BAT54
SOT-23200mA 2uA@25V 30V 800mV@100mA Independent SOT-23 Schottky Diodes ROHSFOSANSchottky Diodes
README
README.mdElectronULA
Project to create replacement ULA board for the Acorn Electron. See Wiki
Parts
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 0.1uf | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14 |
| 8 | 74LVC4245APW | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U1, U2, U3, U4, U5, U6, U7, U8 |
| 6 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2, R3, R4, R5, R9, R11 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad | H2, H2, H2, H2 |
| 2 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R7, R8 |
| 2 | Conn_02x20_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J1, J2 |
| 1 | 0.1uf | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1 |
| 1 | 2.26K | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R6 |
| 1 | 2.7nf | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2 |
| 1 | 3.09K | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R10 |
| 1 | 74HCT125D | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U10 |
| 1 | BAT54 | Diode_SMD:D_SOD-323_HandSoldering | D1 |
| 1 | Conn_02x06_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x06_P2.54mm_Vertical | J3 |
| 1 | ELECTRON_ULA_PGA_68 | Package_LCC:PLCC-68_THT-Socket-Electron-ULA | U9 |
| 1 | MIC7221YM5-TR | Package_TO_SOT_SMD:SOT-23-5 | U11 |
Questions
How big is the ElectronULA PCB?
It measures 49 × 75 mm and has 4 copper layers, 1.6 mm thick.
What parts does the ElectronULA use?
44 parts, built around the 74HCT125DB, 74LVC4245APW, MIC7221YM5-TR and BAT54. 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 ElectronULA KiCad files?
From the adbsolutions/ElectronULA repository on GitHub, at the commit this page was made from: the board is Kicad/ElectronULA - Core Carrier Board/ElectronULA.kicad_pcb and its schematic Kicad/ElectronULA - MAX 10 Board V1.05/ElectronULA.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ElectronULA design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
More from adbsolutions/ElectronULA
1Similar boards
- 4 layers55 × 89 mm
- 4 layers92.9 × 45 mm
Post box usb
google/myelin-acorn-electron-hardware
Phillip Pearson's retro hardware projects for the Acorn Electron
116 parts59Apache-2.0 - 4 layers65 × 46.4 mm
Ft601-shield
JosephFeld/ft601-element
FT Element, but with an FT601 instead of an FT600 for double the data rate
47 parts - 2 layers96.5 × 55 mm
- 2 layers167 × 115 mm
- 2 layers96.5 × 55 mm
Vera full audiojack
ifilot/open-vera-module
VERA (Versatile Embedded Retro Adapter) is a self-contained FPGA video and audio module for retro-computing projects.
105 partsMIT - 2 layers178.2 × 110.9 mm
LegRobotBoardTeensy
01binary/str1ker
A human-scale mech integrated with Robot Operating System
179 parts20 - 4 layers162 × 115 mm
Fome mc
halbritt/fome-mc
FOME-MC integrated single-PCB motorcycle ECU (STM32H753 + 2x STM32F042 WBO)
514 parts1