2 layers229.9 × 93.3 mm
2 layers119.4 × 45.7 mm
Stepper motor controller 2
ethanjamesauto/modular_8bit_computer2- Size
- 119.4 × 45.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 118
- Nets
- 75
- Pads
- 419
- Tracks, vias
- 1,146, 108
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 18 Aug 2024
- Updated
- 8 Nov 2025
Overview
Stepper motor controller 2 is an open-source printed circuit board by ethanjamesauto, from the ethanjamesauto/modular_8bit_computer repository on GitHub. It is a 2-layer board of 119.4 × 45.7 mm with 118 parts on 75 nets, routed with 1,146 tracks and 108 vias.
It is built around the 74LS74PC, 74LS136PC and 178-009-613R571. Its parts include 91 resistors, 25 ICs, 1 diode and 1 connector. It belongs with the robots and motor control boards of this library.
Main components
3
74LS74PC
DIP-140ns 0℃~+70℃ 1 2 20MHz 3.5pF 35ns@5V,50pF 4.5ns 4.75V~5.25V 400uA 74LS Series 8mA 8mA Asynchronous Complementary D-Type Rising Edge Set and Reset DIP-14 Flip FlopsTexas InstrumentsFlip Flops74LS136PC
PDIP-140℃~+70℃ 10mA 4 4.75V~5.25V 74LS Series XOR Gate PDIP-14 Logic Gates ROHSTexas InstrumentsLogic Gates178-009-613R571
--55℃~+105℃ 2 5A Male Panel Mount - New Arrivals ROHSNorCompD-Sub / VGA Connectors
README
README.mdModular 8-bit Computer
This is the repository for an 8-bit computer system that is built using cards with a standardized interface.
- CPU card
- Protoboard card
- This card contains an onboard clock generator, address and data registers/buffers, and a protoboard area for testing designs.
- Bus interface modeling
Here's an example of a card:
Current Bus Specification
// The main bus wires (32+8=40 wires total)
// On the bus connector, all buses have LSBs closer to the power pins and MSBs farther away
wire VCC_5V;
wire GND;
wire clk; // generated by motherboard clock generator
wire rst_n; // probably a button on the motherboard
wire VCC_3V3;
wire we_n; // active LOW
wire oe_n; // active LOW
wire int_n; // pulled up by motherboard; driven down by any peripheral (could be used for interrupts)
wire [7:0] data;
wire [15:0] addr; // 64k address space is suppored by default. More address bits may be added later
wire [7:0] aux_bus;Parts
118| Qty | Value | Footprint | References |
|---|---|---|---|
| 85 | 1 | Resistor_SMD:R_1206_3216Metric | R1, R2, R10, R11, R12, R13, R14, R15, R16, R19, R20, R21, R22, R23, R24, R25 +69 |
| 21 | ~ | Package_DIP:DIP-8_W7.62mm | U2, U4, U10, U12, U13, U14, U15, U16, U17, U18, U19, U20, U24, U25, U26, U27 +5 |
| 4 | 5k | Resistor_SMD:R_1206_3216Metric | R17, R18, R51, R52 |
| 2 | 74LS74 | Package_DIP:DIP-14_W7.62mm | U1, U28 |
| 1 | 178-009-613R571 | 178-009-613R571:178-009-613R571 | J2 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R38 |
| 1 | 74LS136 | Package_DIP:DIP-14_W7.62mm | U3 |
| 1 | 820 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R37 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | LM317_TO-220 | Package_TO_SOT_THT:TO-220-3_Vertical | U11 |
Questions
How big is the Stepper motor controller 2 PCB?
It measures 119.4 × 45.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Stepper motor controller 2 use?
118 parts, built around the 74LS74PC, 74LS136PC and 178-009-613R571. 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 Stepper motor controller 2 KiCad files?
From the ethanjamesauto/modular_8bit_computer repository on GitHub, at the commit this page was made from: the board is stepper_motor_controller/stepper_motor_controller_2/stepper_motor_controller_2.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stepper motor controller 2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask ethanjamesauto before reusing the design.
More from ethanjamesauto/modular_8bit_computer
12- 2 layers229.9 × 83.8 mm
- 2 layers229.9 × 93.3 mm
- 2 layers229.9 × 83.8 mm
- 2 layers222.3 × 127 mm
- 2 layers86.4 × 53.8 mm
- 2 layers229.9 × 86.4 mm
- 2 layers2.8 × 6.6 mm
- 2 layers111.8 × 77.2 mm
- 2 layers48.3 × 48.3 mm
- 2 layers104.1 × 50.8 mm
- 2 layers132.1 × 83.8 mm
Similar boards
- 4 layers170 × 170 mm
- 2 layers
Vortex f1-d clone
hanshuebner/cpc-floppy-controllers
MOVED to code.netzhansa.com/hanshuebner/cpc-floppy-controllers. This GitHub mirror is archived.
60 parts7 - 2 layers248.9 × 139.7 mm
6809 Plus EPROM Version
roberto314/GIMIX_reproduction
Reproducing SS-50 and SS-30 cards and GIMIX Ghost Case and Mainboard
167 parts1BSD-2-Clause - 2 layers93.4 × 80.2 mm
- 2 layers320.7 × 155.8 mm
- 2 layers115.8 × 142.7 mm
S OS OPN
yanataka60/S-OS_OPN
Oh!MZに掲載されたハード版S-OS"MACE" I/Oポート及びFM音源ボートを1枚にまとめMZ-2000の拡張ボードとして設計してみました
91 parts1MIT - 2 layers165.1 × 114.3 mm
ACE COLOUR2
flypie/Ace-2019
Reimplimentation of the Jupiter ACE with slightly more modern hardware. https://www.jupiter-ace.co.uk/ the KiCad versions are the up to date designs which are available at https://jupiterdeuce.blogspot.com and…
95 parts13GPL-3.0 - 2 layers231.1 × 106.7 mm
