2 layers229.9 × 93.3 mm
2 layers104.1 × 25.4 mm
8 bit logic analyzer
ethanjamesauto/modular_8bit_computer2- Size
- 104.1 × 25.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 60
- Nets
- 71
- Pads
- 243
- Tracks, vias
- 712, 47
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 18 Aug 2024
- Updated
- 8 Nov 2025
Overview
8 bit logic analyzer 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 104.1 × 25.4 mm with 60 parts on 71 nets, routed with 712 tracks and 47 vias.
It is built around the 74LS00SC, 74LS161DC and 74LS195APC, with the 74LS74PC and FDG1024NZ among its other parts. Its parts include 23 resistors, 18 diodes, 8 connectors, 7 ICs and 3 capacitors. It belongs with the sensors and measurement and retro computing and games boards of this library.
Main components
5
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers
74LS195APC
PDIP-160℃~+70℃ 1 4 4.75V~5.25V 74LS Asynchronous clear function、Asynchronous parallel load function PDIP-16 Shift RegistersTexas InstrumentsShift Registers
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 Flops
FDG1024NZ
SC-88-6-55℃~+150℃ 1.2A 150pF 175mΩ@4.5V 1V 2 N-Channel 2.6nC@4.5V 20V 25pF 35pF 360mW N-Channel SC-88-6 MOSFETs ROHSonsemiMOSFETs
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
60| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | 470 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4, R6, R7, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R22, R23 +2 |
| 16 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18 |
| 3 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5, J6, J7 |
| 2 | 0 | Resistor_SMD:R_0603_1608Metric | R5, R21 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | 1uF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C10, C11 |
| 2 | Conn_01x07_Pin | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J3, J4 |
| 2 | Conn_01x10_Pin | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J1, J2 |
| 2 | D | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D1, D2 |
| 2 | ~ | Package_DIP:DIP-16_W7.62mm_Socket | U2, U4 |
| 1 | 100nF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C4 |
| 1 | 4.7 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm | U8 |
| 1 | 74LS138 | Package_DIP:DIP-16_W7.62mm | U6 |
| 1 | 74LS161 | Package_DIP:DIP-16_W7.62mm | U9 |
| 1 | 74LS195 | Package_DIP:DIP-16_W7.62mm | U5 |
| 1 | 74LS74 | Package_DIP:DIP-14_W7.62mm | U7 |
| 1 | Conn_01x01_Pin | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J8 |
| 1 | FDG1024NZ | Package_TO_SOT_SMD:SOT-23-6_Handsoldering | Q1 |
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Questions
How big is the 8 bit logic analyzer PCB?
It measures 104.1 × 25.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 8 bit logic analyzer use?
60 parts, built around the 74LS00SC, 74LS161DC, 74LS195APC and 74LS74PC. 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 8 bit logic analyzer KiCad files?
From the ethanjamesauto/modular_8bit_computer repository on GitHub, at the commit this page was made from: the board is 8_bit_logic_analyzer/8_bit_logic_analyzer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 8 bit logic analyzer design in my own project?
Its repository states no licence, so its author keeps all rights: ask ethanjamesauto before reusing the design.