HardLabs

Add

fread·visvitalis·new-parts/add/add.kicad_pcb

Add PCB layout, top view — open source board by fread

About the Add PCB

Add is an open source PCB design by fread, published on GitHub. It is a 2-layer board measuring 97.8 × 125.7 mm, with 30 components from 4 distinct parts.

By type, the board carries 16 relays, 8 diodes and 6 connectors.

From the project

A very simple modular relay computer

This project contains plans for PCB modules to build a relay processor, complete with assembler and emulator. While the actual processor is made out of relays (and the occasional diode), memory is emulated by ESP-based boards. Their firmware also provides for loading programs and monitoring memory contents via a USB-TTY connection.

Processors are, fundamentally, not that complicated. At any rate, you can build one out of much less than the billions of transistors required for a desktop CPU. And it's a worthwhile endeavour, too, being actually able to understand a whole processor, albeit a…

Add bill of materials (BOM)

30 components, 4 distinct parts.

QtyPartRefs
4
BHR-10-VUA
J1, J2, J3, J4
2
Conn_01x02
J5, J6
16
J104D2C12VDC.15S
K1, K2, K3, K4, K5, K6, K7, K8 +8
8
SMAJ14CA
D1, D2, D3, D4, D5, D6, D7, D8

Add design files

The KiCad project lives in the fread/visvitalis repository on GitHub; these links point at the commit this page was built from.

Add: common questions

How big is the Add PCB?

The Add measures 97.8 × 125.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Add?

30 components, from 4 distinct parts. The full bill of materials is listed on this page.

Where can I download the Add design files?

From the fread/visvitalis repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Add design in my own project?

The repository has no license, so all rights stay with fread. Use it as a reference, and ask the author before reusing the design.

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