2 layers160 × 100 mm
2 layers160 × 100 mm
Ledrom
Noah1989/loopmicro2An 8-bit microcomputer for the 21st century
- Size
- 160 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 213
- Nets
- 242
- Pads
- 1,527
- Tracks, vias
- 3,594, 120
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 15 May 2019
- Updated
- 3 Aug 2026
Overview
Ledrom is an open-source printed circuit board by Noah1989, from the Noah1989/loopmicro repository on GitHub, published under the MIT licence. It is a 2-layer board of 160 × 100 mm with 213 parts on 242 nets, routed with 3,594 tracks and 120 vias.
It is built around the 74ACT244SC, 74AC138SC and 74HC4075D, with the ZVP3306A among its other parts. Its parts include 128 connectors, 64 transistors, 12 ICs, 4 capacitors and 1 resistor.
Main components
4
74ACT244SC
SOIC-20-300mil-40℃~+85℃ 2 24mA 24mA 4.5V~5.5V 40uA 74ACT 7ns@5V,50pF 8 Bidirectional Output enable Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSonsemiBuffers, Drivers, Receivers, Transceivers
74AC138SC
SOIC163-of-8 Decoder/DemultiplexerFAIRCHILDUncategorised
74HC4075D
SO-14-40℃~+125℃ 1.5V~4.2V 1.9V、4.4V、5.9V 100mV、100mV、100mV 17ns@6V,50pF 2V~6V 3 3 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series OR Gate SO-14 Logic Gates ROHSNexperiaGates
ZVP3306A
TO-92-55℃~+150℃ 1 P-Channel 14Ω@10V 160mA 25pF 3.5V 50pF 60V 625mW 8pF P-Channel TO-92 MOSFETs ROHSDiodes IncorporatedMOSFETs
README
README.mdLoop Microcomputer
a minmal 8-bit machine that is...
-
... independent:
- contains all the tools required to design another version of itself
- does not require high soldering skills, uses through-hole parts only
- uses only "evergreen" parts that have been in production for decades and are still made today
-
... aproachable:
- simple through reduction
- NO hidden complexity behind brittle abstractions
- open source and self-documenting
-
... powerful, with it you can:
- learn/teach how computers work
- design electronics
- control CNC machines / 3d printers
- play games
Parts
213| Qty | Value | Footprint | References |
|---|---|---|---|
| 128 | Conn_02x04_Odd_Even | Socket_Strips:Socket_Strip_Straight_2x04_Pitch2.54mm | J1, J10, J11, J100, J101, J102, J103, J104, J105, J106, J107, J108, J109, J110, J111, J112 +112 |
| 64 | ZVP3306A | TO_SOT_Packages_THT:TO-92_Inline_Narrow_Oval | Q1, Q2, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23 +48 |
| 9 | 74AC138 | Housings_DIP:DIP-16_W7.62mm_Socket | U1, U3, U4, U5, U6, U7, U8, U9, U10 |
| 3 | 10nF | Capacitors_THT:C_Rect_L7.0mm_W2.5mm_P5.00mm | C2, C3, C4 |
| 2 | 74HC4075 | Housings_DIP:DIP-14_W7.62mm_Socket | U11, U12 |
| 1 | 10kΩ | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 1µF | Capacitors_THT:CP_Radial_D5.0mm_P2.00mm | C1 |
| 1 | 220Ω | Resistors_THT:R_Array_SIP9 | RN1 |
| 1 | 74ACT244 | Housings_DIP:DIP-20_W7.62mm_Socket | U2 |
| 1 | C96ABC | Connectors_IEC_DIN:Socket_DIN41612-CaseC1-full-Male-96Pin-3rows | JB1 |
| 1 | DIPSWITCH | Buttons_Switches_THT:SW_DIP_x1_W7.62mm_Slide | JP1 |
| 1 | LOGO | misc:logo | G*** |
Questions
How big is the Ledrom PCB?
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ledrom use?
213 parts, built around the 74ACT244SC, 74AC138SC, 74HC4075D and ZVP3306A. 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 Ledrom KiCad files?
From the Noah1989/loopmicro repository on GitHub, at the commit this page was made from: the board is hardware/ecb-prototype/deprecated/ledrom/ledrom.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ledrom 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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