Series 1 - Arithmetic Unit
The S1-AU PCB

Our popular S1-AU kit provides a tactile way to rediscover the inner workings of a computer using classic 7400 series ICs. It is a unique and rewarding soldering exercise for pragmatic computing enthusiasts, hobbyists and makers.

Introducing the ARITH-MATIC S1-AU Mk1:

The S1-AU Mk1 is a beautifully crafted DIY electronic kit designed with classic 7400 series ICs.

It is a unique, fun and rewarding soldering exercise enabling you to rediscover how computers really work! Explore binary notation, digital electronics, the joy of 7400 series ICs and the simple logical mechanisms found at the heart of every digital computer.

Explore the fundamentals of computing with the S1-AU Mk1

Using 74HC173 registers for temporary data storage, a 74HC283 full adder for binary calculations, and a 74HC85 comparator for logical comparisons, the assembled board will enable you to learn about binary addition, subtraction, accumulation and comparison in a practical and hands-on way.

The S1-AU operates through tactile interactions using a carefully designed array of push button switches, and binary operations can be visually traced through a series of on-board ultra bright LEDs - each representing the state of a 7400 IC. The S1-AU is powered via a USB mini cable, so you don't need to rely on batteries.

What is an arithmetic unit?

An arithmetic unit enables computers to perform binary arithmetic. It is one of the most important parts of a CPU (Central Processing Unit) and can be found at the heart of every digital computer. An arithmetic unit which also performs bitwise logical operations is commonly referred to as an ALU (Arithmetic Logic Unit).

"Really, really insanely nice - I've been assembling PCB kits for about a decade from the likes of Adafruit and EMSL, and you've blown them out the water... Genuinely the classiest kit I've handled."
- Steve @IrregularShed, UK

What's included in the S1-AU Mk1 Kit?

The kit contains all the through-hole electronic components you’ll need to build a working 4-bit arithmetic unit and includes:

Kit contents of the S1-AU Mk1
The S1-AU DIY Electronic Kit

The kit is supplied with our comprehensive 'Operator's Technical Manual' (as a downloadable .pdf - English language only) which describes in detail what the arithmetic unit is and how ALUs are used more generally in computers.

The manual also explains how to fully construct and operate the S1-AU and gives a primer on binary operations (addition, subtraction & twos complement) for those who may not be familiar with binary arithmetic. Our mainboard PCB has been carefully crafted to complement the manual and aid construction.

Performing 4-bit accumulation with the S1-AU Mk1

The S1-AU Mk1 is recommended for ages 16+ and some soldering experience is required to construct the kit.

"Your 4-bit AU kit is a beauty, fun to build and enjoyable to play with!"
- Marcel @gigatronTTL, Holland

Order your kit now!

Our kits will help you to delve directly into the guts of computing, enabling you to rediscover what computers are really made of! Explore binary notation, digital electronics, the joy of 7400 series ICs and the simple logical mechanisms found at the heart of every digital computer.

For a fun and rewarding soldering experience, why not dust off the soldering iron and join the growing band of S1-AU owners who are rediscoving the beauty of computational hardware.

To order, simply click 'Add to Cart' for quick, secure and hassle free online payment.

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S1-AU Mk1

RRP £49.95
Price £44.95 (10% OFF)

Shipping to UK / EU / US only.

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