Computational Hardware for Pragmatists

ARITH-MATIC is a British computational hardware project and micro startup. We craft a range of DIY electronic kits which explore the guts of computing.

Our flagship kit - the S1-AU Mk1 - is a 4-bit arithmetic unit. It is designed with classic 7400 series ICs and enables you to rediscover the mechanisms hidden away in today's modern machines.

Explore the fundamentals of computing with the S1-AU Mk1

The kit is not only a pragmatic and tactile introduction to computing hardware and digital electronics, but also a unique soldering exercise for computing enthusiasts, hobbyists and makers.


Our kits contain all the through-hole electronic components you’ll need to build your own computational hardware and enable you to visually trace computing operations through a series of on-board ultra bright LEDs.

Along with our comprehensive Operator’s Technical Manuals, our beautifully crafted PCBs will guide you through construction and operation. All you need to bring is your trusty soldering iron and a steady hand.

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.

To learn more about the S1-AU, or our soon to be launched second kit - the S1-MU - please visit our DIY Electronic kits page.

Or, sign up to our mailing list for the lastest ARITH-MATIC news, special deals and community content.

"This 4-bit arithmetic logic unit looks great and teaches important lessons about computing." - Stephen Cass, IEEE Spectrum Review

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