2 layers2.8 × 6.6 mm Fish, the printed circuit board in 3D

Fish

Size: 2.8 × 6.6 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 166
Nets: 185
Pads: 461
Tracks, vias: 0, 0
Routed: Not yet
KiCad: KiCad 7 (file 20221018)
Created: 18 Aug 2024
Updated: 8 Nov 2025

Overview

Fish 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 2.8 × 6.6 mm with 166 parts on 185 nets.

It is built around the TPS76316DBV, TPS76318DBV and TPS76333DBV, with the TPS76350DBV among its other parts. Its parts include 112 resistors, 18 capacitors, 16 diodes, 6 ICs and 5 connectors.

Main components

README

README.md

Modular 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

verilog

// 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

166

Qty	Value	Footprint	References
109	0	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R1, R10, R11, R12, R13, R100, R101, R102, R103, R104, R105, R106, R107, R108, R109, R110 +93
16	C	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16
8	LED	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D1, D2, D3, D12, D13, D14, D15, D16
4	D_Schottky	Diode_SMD:D_2010_5025Metric_Pad1.52x2.65mm_HandSolder	D4, D5, D6, D7
4	D_Zener	Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D8, D9, D10, D11
4	TestPoint_Probe	TestPoint:TestPoint_Pad_D1.0mm	TP1, TP2, TP3, TP4
3	L_Iron_Coupled_Small_1243	Transformer_SMD:Pulse_PA2001NL	L1, L2, L3
2	0	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R111, R112
2	C	Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C17, C18
2	Conn_01x20_Socket	Connector_PinHeader_2.54mm:PinHeader_1x20_P2.54mm_Vertical	J1, J2
1	Conn_01x03_Socket	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J3
1	Conn_01x08_Socket	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	J5
1	SG-5032CAN	Oscillator:Oscillator_SMD_SeikoEpson_SG8002LB-4Pin_5.0x3.2mm	X2
1	SW_Push	Button_Switch_SMD:SW_DIP_SPSTx01_Slide_6.7x4.1mm_W6.73mm_P2.54mm_LowProfile_JPin	SW1
1	TPS76316	Package_TO_SOT_SMD:SOT-23-5	U5
1	TPS76318	Package_TO_SOT_SMD:SOT-23-5	U4
1	TPS76329	Package_TO_SOT_SMD:SOT-23-5	U3
1	TPS76333	Package_TO_SOT_SMD:SOT-23-5	U6
1	TPS76350	Package_TO_SOT_SMD:SOT-23-5	U2
1	locked	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R68
1	~	Connector_Molex:Molex_SlimStack_502426-2410_2x12_P0.40mm_Vertical	J4
1	~	Package_DFN_QFN:VQFN-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm_ThermalVias	U1

Questions

How big is the Fish PCB?

It measures 2.8 × 6.6 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Fish use?

166 parts, built around the TPS76316DBV, TPS76318DBV, TPS76333DBV and TPS76350DBV. 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 Fish KiCad files?

From the ethanjamesauto/modular_8bit_computer repository on GitHub, at the commit this page was made from: the board is fish/fish.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Fish design in my own project?

Its repository states no licence, so its author keeps all rights: ask ethanjamesauto before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/ethanjamesauto-modular-8bit-computer-fish" title="Fish in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/ethanjamesauto-modular-8bit-computer-fish.jpg" alt="Fish" width="1200" height="900">

A picture that opens the board, for a README

[![Fish](https://pcbkit.io/embed/boards/ethanjamesauto-modular-8bit-computer-fish.jpg?size=s)](https://pcbkit.io/boards/ethanjamesauto-modular-8bit-computer-fish)

Source

Repository: ethanjamesauto/modular_8bit_computer
Board file: fish/fish.kicad_pcb
Commit: 4215150
Licence: Not stated

Similar boards

4 layers142 × 119.7 mm
QMTech MiSTeX
MiSTeX-devel/MiSTeX-hardware
Hardware for MiSTeX
247 parts73
2 layers25 × 40 mm
PmodUsbUlpi
twam/PmodUsbUlpi
Pmod™ Compatible USB ULPI PHY
22 parts16
2 layers62 × 66.4 mm
Lt6c pcb
lambdakb/trackball-lt6c
LT6C 6 Keys Trackball
19 parts9CERN-OHL-S-2.0
2 layers62 × 84 mm
Lt7dk pcb
lambdakb/trackball-lt7dk
LT7DK PMW3360 Trackball Development Kit
54 parts2CERN-OHL-S-2.0
4 layers48.5 × 25 mm
WIFI IMU
nikit6000/WirelessIMU
A board for wireless motion tracking
70 partsGPL-2.0
4 layers100 × 50 mm
Hairymnstr oggbox oggbox
oomlout/oomlout_oomp_project_bot_v_2

169 parts
2 layers160 × 90 mm
Power Integrations interface
paltatech/VESC-controller
Made open source with KiCAD, an open source EDA tool.
1,126 parts356
2 layers58.5 × 25 mm
Current sensor
paltatech/current_sensor
Isolated delta sigma current sensor for high speed high current application
47 parts8